hiq9200 giai phap trung ke ao ngn surpass cua siemens

8/6/2019 Hiq9200 Giai Phap Trung Ke Ao Ngn Surpass Cua Siemens

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TP ON BU CHNH VIN THNG VIT NAM

HC VIN CNG NGH BU CHNH VIN THNGC S THNH PH H CH MINH

CHUYN CHUYN MCH:

HiQ9200

Gio vin hng dn: Th.S Nguyn Xun KhnhNhm SV thc hin : Nhm 3Lp : 07VTA2+3

Thnh Ph H Ch MinhThng 6 - 2011


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CHUYN MN K THUT CHUYN MCH:

HiQ9200

Gio vin hng dn : Th.S Nguyn Xun Khnh Nhm SV thc hin : Nhm 3Lp : 07VTA2+3

Danh sch thnh vin nhm 3 thc hin chuyn :

STT H v tn M s Sinh vin Lp

1 Nguyn Vn Linh 407160134 07VTA32 Trn Quang Nht Huy 407160129 07VTA3

3 Nguyn Hong Lm 407160133 07VTA3

4 Trng Nhm Thanh 407160094 07VTA2

5 inh Tun Anh 407160111 07VTA3

6 V Trng i 407160117 07VTA3

7 Nguyn Hu Sn 407160149 07VTA3

8 Nguyn Thanh Tm 407160151 07VTA3

9 Trn Ngc Sn 407160090 07VTA2

10 L T Ph M 407160139 07VTA3


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MC LC

CHNG 1: CU TRC THIT B PHN CNGCA SOFTSWITCH HiQ9200.............................................................................1

1.1 Gii thiu s lc v ngun gc ra i ca NGN

v chuyn mch mm (Softswitch)........................................................................................1

1.2 M hnh gii php mng NGN SURPASS ca Siemens.......................................................3

1.3 Gii thiu thit b HiQ9200.....................................................................................................5

1.3.1 Media Gateway Controller (MGC)............................................................................5

1.3.2 Signalling Gateway.....................................................................................................6

1.3.3 Media Gateway...........................................................................................................6

1.4 Cc thnh phn chc nng ca Surpass HiQ9200 ..................................................................7

1.4.1 Cc thnh phn ca Surpass HiQ9200 ........................................................................7

1.4.2 Chc nng ca Surpass HiQ9200................................................................................9

1.5 Kin trc phn cng ca Softswitch HiQ9200......................................................................11

1.6 Chc nng phn mm ca khi Softswitch HiQ9200...........................................................13

CHNG 2: GII THIU V TRUNG K O V CC GIAO THC BO HIU SDNG TRONG GII PHP TRUNG K O ................................................................................20

2.1 Gii thiu v mng trung k o..............................................................................................20

2.2 Giao thc bo hiu MGCP .....................................................................................................21

2.3 Giao thc bo hiu SIGTRAN...............................................................................................23

2.4 Giao thc RTP.........................................................................................................................26

2.5 Bo hiu H.323........................................................................................................................28

2.6 Giao thc SIP ..........................................................................................................................31

CHNG 3: CC NG CNH THIT LP TRUNG K O, THIT LP CUC GICALL FLOW TRONG HIQ9200 ......................................................................................................34

3.1 Thu bao PSTN n thu bao PSTN .....................................................................................34

3.2 Thu bao PSTN n H.323 (RFS hoc Pure)........................................................................46

3.3 H.323 (FSB hoc Pure) ti thu bao PSTN...........................................................................48

3.4 H.323 (RFS/PURE) n H.323 (FFS) phi hp vi vng lp ISUP ...................................52

3.5 H.323 (FFS) n H.323 (RFS/PURE) phi hp vi vng lp ISUP ...................................53

3.6 H.323 (FFS) n H.323 (FFS)................................................................................................54

TI LIU THAM KHO ............................................................................................................55


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Nhm 3 HiQ9200 Page 11

CHNG 1: CU TRC THIT B PHN CNG

CA SOFTSWITCH Hi9200

1.1 Gii thiu s lc v ngun gc ra i ca NGN v chuyn mch mm(Softswitch)

Vin thng Vit Nam ang c nhng bc pht trin mnh m v vt bc, tr thnhmt trong nhng ngnh kinh t k thut mi nhn ca t nc, ng gp mnh m vo s

pht trin kinh t x hi ni chung ca t nc. S pht trin ca ngnh bt u bng vicxy dng v pht trin mt mng PSTN cung cp dch v thoi truyn thng cht lng tt

cho khch hng. Tuy nhin cng vi thi gian mng PSTN bc l mt s hn ch: cc tngi chuyn mch knh khai thc ht nng lc v tr nn lc hu so vi nhu cu cakhch hng hin nay, s km hiu qu ca TDM trong vic phn b bng thong, mngPSTN c nhiu cp nn phc tp trong vic phi hp h thng bo hiu, ng b.

Mt khc, nhu cu v cc dch v d liu pht trin mnh m, Internet ngy cng phbin rng ri, xu th tch hp IP/ATM/MPLS cho mng ng trc cng vi s pht trinca nn vin thng th gii i hi phi c mt mng mi c bng tn rng, hiu sut cao,h tr nhiu dch v, n gin v cu trc v qun l, d dng pht trin dch v v nhanh

chng cung cp n khch hng. C 2 s la chn: mt l xy dng mt c s h tng hantan mi, hai l xy dng mt mng c kh nng cung cp cc dch v IP bng cch nngcp trn c s h tng mng PSTN c sn.

Vic xy dng mt c s h tng mi l chuyn kh lm c trong thi gian ngn, vs tn kh nhiu chi ph. Cho nn mng th h mi NGN (Next Generation Network) c hnh thnh v pht trin.

S pht trin ca cng ngh thng tin, cng ngh chuyn mch gi v cng ngh truyndn bng rng l ngun gc ra i mng thng tin th h sau nhm trin khai cc dch v

mt cch a dng nhanh chng, p ng s hi t gia thoi v s liu, gia c nh v ding. Hin nay trn th gii cc t chc vin thng vn cn ang nghin cu v NGN caring mnh. Do c im ca NGN l cu trc phn lp theo chc nng v phn tn cctim nng trn mng nn lm cho mng tr nn mm ha, s dng rng ri cc giao dinAPI lm cho cc dch v khng ph thuc nhiu vo cc nh cung cp thit b v khai thcmng.

Cc hng cung cp thit b vin thng gii thiu nhiu m hnh kin trc mng NGN

khc nhau, km theo cc gii php mng v sn phm mi khc nhau do h cung cp.V d:


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SURPASS ca Siemens, 1000 MM E10 ca Alcatel (hay Alcatel 1000 softswitch),

ENGINE ca Ericsson,

Vi s tham gia ca nhiu hng v mt s nh khai thc, mng th h mi thu ht squan tm ca nhiu t chc vin thng nhm hng ti mt m hnh kin trc mng mitrn nn tng cng ngh hin i, u t hiu qu, p ng nhu cu pht trin phong ph adng cc dch v.

Hin nay NGN ca VNPT ang c trin khai da trn gii phi SURPASS ca

Siemens. y l mng c h tng thng tin duy nht da trn cng ngh chuyn mch gi

c VNPT la chn thay th cho mng chuyn mch knh truyn thng. Vi u th

cu trc phn lp theo chc nng v s dng rng ri cc giao din API kin to dch v

m khng ph thuc nhiu vo cc nh cung cp thit b v khai thc mng, cng ngh NGN p ng c yu cu kinh doanh trong tnh hnh mi l dch v a dng, gi

thnh thp, u t hiu qu v to c ngun doanh thu mi. y l mng s dng cng

ngh chuyn mch gi vi c tnh linh hot, ng dng nhng tin b ca cng ngh thng

tin v cng ngh truyn dn quang bng thng rng nn tch hp c dch v thoi v dch

v truyn s liu.

Chuyn mch mm c th nh ngha nh l tp hp cc sn phm, giao thc v ccng dng cho php bt k cc thit b no truy cp cc dch v truyn thng qua mng xy

dng trn nn cng ngh chuyn mch gi thng l IP (Internet protocol). Nhng dch v bao gm thoi, fax, video, d liu v cc dch v mi c th c pht trin trong tnglai. Nhng thit b u cui truy nhp bao gm in thoi truyn thng, in thoi IP, mytnh, my nhn tin...Mt sn phm Softswitch c th bao gm mt hay nhiu thnh phnchc nng, cc chc nng c th cng nm trn mt h thng hoc phn tn trn nhng hthng thit b khc nhau.

Softswitch nhn chung cung cp cc chc nng ging nh cc chc nng ca h thngchuyn mch knh, n ch khc l c thit k cho mng chuyn mch gi v c kh nng

lin kt vi mng PSTN. Cc tnh cht khc bit ca mt h thng chuyn mch mm baogm:

- L h thng c kh nng lp trnh x l cc cuc gi v h tr cc giao thc camng PSTN, ATM v IP.

- Hot ng trn nn cc my tnh v cc h iu hnh thng mi.

- iu khin cc Gateway trung k ngoi (External trunking Gateway), Gateway truynhp (Access Gateway v cc Server truy nhp t xa RAS (Remote Access Server).


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- N ti s dng cc dch v IN thng qua cc danh b m mm do.

- Cung cp cc giao din lp trnh ng dng m API cho cc nh pht trin th 3 nhm

to ra cc dch v th h sau.

- N c cc chc nng lp trnh cho cc h thng Back office.

- C cc h thng qun l tin tin trn c s my ch (Policy Server based) cho tt ccc module phn mm.

Mt c im na ca SoftSwitch l Softswitch khng phi lm nhim v cung cpknh kt ni nh tng i v lin kt thng tin c c s h tng mng NGN thc hintheo cc cng ngh chuyn mch gi tc l chuyn mch mm khng thc hin bt c

chuyn mch g. Tt c cc cng vic ca Softswitch c thc hin vi mt h thngcc module phn mm iu khin v giao tip vi cc phn khc ca mng NGN, chy trnmt h thng my ch c hiu nng tin cy v sn sng v mc nh cung cpdch v (Carrier Class).

1.2 M hnh gii php mng NGN SURPASS ca Siemens.

Gii php mng NGN ca Siemens da trn kin trc phn tn, xa i khong cch gia

mng PSTN v mng s liu. Cc h thng a ra vn da trn kin trc pht trin ca h

thng chuyn mch m ni ting ca Siemens l EWSD. Siemens gii thiu gii php mng

th h mi c tn l SURPASS.

Phn chnh ca SURPASS l h thng SURPASS hiQ, y c th coi l h thng ch

tp trung (Centrallized Sever) cho lp iu khin ca mng vi chc nng nh mt h

thng ca ng (Gateway) mnh iu khin cc tnh nng thoi, kt hp kh nng bo

hiu mnh kt ni vi nhiu mng khc nhau.

Trn h thng ny c khi chuyn i bo hiu bo hiu S 7 ca mng PSTN/ISDNsang giao thc iu khin cu ng trung gian MGCP. Ty theo chc nng v dung lng,

SURPASS hiQ c chia thnh cc loi khc nhau nh SURPASS hiQ 10, 20 hay

SURPASS hiQ 9100, 9200, 9400.


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M hnh mng NGN ca Siemens

y l sn phm quan trng nht trong cu trc mng NGN ca Siemens. Surpass l h

thng ch tp trung qun l ca hu ht cc thit b trong cu trc mng NGN ca Siemens.

Hnh v sau s ch ra s qun l tp trung ny.

LP IU KHIN

LP TRUY NHP

LP TRUYN TI

Khai bo v qun ldch v

Qun l kt

ni Qun lmng

Truyn dn

Cng niPOTS,ISDN

IP,ATM,FR.

..CABLE

nh tuyn/Chuyn mch nh tuyn/Chuyn mch

Mng truy cp a dch v

PSTN/

ISDN

Cc mng hin c

DN


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1.3 Gii thiu thit b HiQ 9200.

1.3.1 Media Gateway Controller (MGC).

MGC l thit b u no trong NGN, thng c gi l Softswitch hay Call Agent. Nlm nhim v iu khin cuc gi, bo hiu cc tnh nng to mt cuc gi trong mng

NGN hay xuyn qua nhiu mng khc (V d: mng PSTN, mng ISDN). Thit b ny cchc nng tng tc vi mng PSTN thng qua cc cng bo hiu (Signalling Gateway),ni cch khc MGC c nhim v to cu ni gia cc mng c c tnh khc nhau gmPSTN, SS7, IP.

MGC c kh nng cung cp iu khin cuc gi tu theo kiu cuc gi, iu khin bohiu v iu khin phng tin. MGC iu khin cuc gi thng qua bo hiu c hai loichnh:

+ Ngang hng (Peer-to-Peer): giao tip gia MGC v MGC s dng giao thc BICChay SIP-T. Kh nng iu khin ngang hng chng t nhiu MGC c th cng tham giaiu khin cuc gi. Trong trng hp mng ln hay v cc l do bo mt, ngi vn hnhcn chia mng ca h thnh cc min khc nhau nhm qun l kch thc mng. Trongtrng hp ny ngi ta s dng nhiu hn mt MGC, c tnh ny cho php qun l hai

SURPASSNG Access

SURPASS

NG Optics

SURPASS

NG Switching

SURPASS

NG Management

NGN

Phn qun l

Phn iukhin

Mng li

Mng truy nhp

PSTN/Mobile

MediaGateway

Switch

SwitchSwitch

Media

Gateway

AccessGatewayMetro

Optics

IP/OpticalBackbone

Residential Customers

Triple PlayVoice, Video,

Multi-Service Access

Application/Video Server

Business Customers

LA

PB

CP

Surpass trong cu trc mng NGN ca Siemens


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min khc nhau mt cch phn bit v lu lng chuyn mch thi gian nh nhau giachng m khng cn thay i phng tin.

+ iu khin truyn thng: giao tip gia MGC v Gateway s dng MGCP hayMEGACO/H.248.

1.3.2 Signalling Gateway (SG)

Signalling Gateway (SG) to ra mt chic cu gia mng bo hiu s 7 vi mng IPdi s iu khin ca MGC.

SG lm cho mt Softswitch ging nh mt nt SS7 trong mng bo hiu s 7.

Nhim v ca SG l x l thng tin bo hiu.* Cc chc nng chnh ca SG

Cc chc nng chnh ca SG bao gm:

- Cung cp mt kt ni vt l n mng bo hiu.

- Truyn thng tin bo hiu gia cc MGC v SG thng qua mng IP

- Cung cp ng truyn dn cho thoi, d liu v video.

- Cung cp cc hot ng SS7 c s sn sng cao cho cc dch v vin thng.

* Cc c tnh h thng ca SG

- SG l mt thit b vo ra.

- Dung lng b nh phi lun m bo lu tr cc thng tin trng thi, thng tincu hnh, v.v..

- Giao din vi mng SS7 bng cch s dng mt lung E1/T1, ti thiu 2 knh D,ti a 16 knh D.

- Yu cu sn sng cao: nhiu SG, nhiu lin kt bo hiu.

1.3.3 Media Gateway (MG)

Media Gateway l phn t giao din then cht gia mng chuyn mch knh v mngchuyn mch gi v phi cung cp cc chc nng iu khin a phng tin: chc nng xl bo hiu nh m ho, gii m, nn d liu thoi, chuyn m, chuyn i Fax, chn

phng tin (DTMS, cc tin nhn), lc v chuyn i modem tng t.


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Mt s chc nng chnh ca Media Gateway:

- Cung cp cc dch v VoIP, VoATM, Dial-in (RAS), m phng knh (Virtual

Trunking).

- H tr QoS vi thi gian tr nh nht vi cc yu cu ng dng thi gian thc nhthoi, video

- H tr cc giao tip vi mng truyn thng (PSTN) v cc giao tip nh RAS(Channel Associate Signalling) v ISDN.

- Truyn d liu thoi s dng giao thc RTP (Real Time Protocol).

- Cung cp khe thi gian T1 l ti nguyn x l tn hiu s (DSP) di s iu khin

ca MGC. ng thi qun l ti nguyn DSP cho dch v ny.- Qun l ti nguyn v kt ni T1.

- Cho php kh nng m rng Media Gateway v cng, card, cc nt m khng lmthay i cc thnh phn khc.

- Cc chc nng hng H.323:

+ Bin dch gia khun dng tn hiu truyn m thanh, hnh nh, dng s liu (V dt H.225 ti H.221 v ngc li chuyn i cc knh mng t pha PSTN thnh cc dng

RTP).+ Bin dch gia cc th tc truyn thng (V d t H.245 n H.242 v ngc li),

thit lp cuc gi v gii phng th tc cung cp cho PSTN.

1.4 Cc thnh phn chc nng ca Surpass hiQ 9200

1.4.1 Cc thnh phn ca Surpass hiQ 9200

HiQ 9200 l h thng ch qun l tp trung cc thit b trong cu trc mng NGN.

m bo chc nng iu khin, bo hiu..v..v. hiQ 9200 phi c cu trc ph hp vi tngchc nng ca chng.

Cu trc ca hiQ 9200 bao gm 5 phn chnh:

Call Feature Server (CFS)

Internal Communcation Network (ICN)

Packet Manager (PM)


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Signal Gateway (SG)

Operation Administration Maintenance (OAM) & P Agent

Call Feature Server CFS: Thc hin iu khin cuc gi n ngi s dng mng. CFS

c chc nng x l bo hiu gi, thc hin iu khin gi, dch v thoi, thit lp cuc gi

v nh tuyn cuc gi. CFS truyn thng cng vi nhiu h thng khc nhau nh Signaling

Gateway, OAM&P Agent v Packet Manager

Internal communcation Network: Trong bt k h thng Chuyn mch/iu khin no

u c nhiu bn tin ph c truyn gia cc h thng ph tr cho nhau. Trong hiQ 9200

khi ny c xy dng tip cn vi HDLC (Hight - Level Data Link Controller). Phn

iu khin ny nm trong phn t chuyn mch ca h thng chuyn mch.

Packet Manager: Thc hin kt ni cho thoi hoc kt ni a phng tin. Cu lnh

ca PM m bo thuc tnh lin mng gia SNC v mng c bn IP bng cch qun l ti

nguyn mng Media Gateway (nh cng VoIP, Codecs..) thng qua MGCP hoc giao

thc MEGACO/H.248.

Signal Gateway: c thit k kt cui ti h thng bo hiu s 7 phn phi trn IP

thng qua SCTP (Stream Control Transmission Protocol) hoc trn cng ngh chuyn mch

knh TDM. SURPASS hiG c kh nng h tr lin kt tn hiu bng hp (56Kbps, 64Kbps) tt nh cc tn hiu bng rng (1.5 Mbps hoc 2Mbps).

OAM & P Agent: Surpass hiQ 9200 Softswitchs cung cp giao din OAM & P Agent

gi thng tin ti nh cung cp mng nh NetManager, thng tin ny c tp hp ti

Surpass hiQ 9200 Softswitch v c x l ti . Thm vo giao din ny c hiQ

9200 Softswitch dng thu nhng cu lnh qun l hiQ 9200 Softswitch nh cp nht

d liu hay cu hnh cc khi ca n.


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1.4.2 Chc nng ca Surpass hiQ 9200

Nh gii thiu v Surpass hiQ 9200, y l h thng ch tp trung iu khin gn

nh xuyn sut cc thit b trong mng NGN. Vi cu trc chc nng trnh by phn

trc chng ta thy vai tr ca hiQ 9200 l trung tm iu khin ca h thng. Cc chc

nng ca hiQ 9220 c th k n l:

- L thit b trung tm thc hin ton b chc nng gim st, iu khin, ghi cc ca

tt c cuc gi trong mng NGN

- Vi giao din m c th m rng v lin kt vi cc thnh phn mng rt d dng

- H tr cc giao thc chun MGCP, MEGACO/H.248

Packet Manager

Call Feature Server

Signaling

Gateway

Internal Communication Network

OAM&P

Agent

Cu trc chc nngca hiQ 9200

hiQ 9200

Giao din timng qun l

Giao din ti mngbo hiu

Giao din timng gi

Cu trc chc nng ca hiQ 9200

Giao din ti

hiQ 4000


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Chc nng iu khin trung tm: Vi cu trc thnh tng phn, Surpass hiQ 9200 c

kh nng thc hin nhiu chc nng ca mng cng mt lc v d nh iu khin

PSTN/ISDN v hi t cc dch v thng qua Call Feature Server, lin kt gia cc h thngbo hiu (SS7 over IP hay SS7 qua mng chuyn mch knh) thng qua Signal Gateway,

iu khin tt c Media Gateway bng cc giao thc iu khin MGCP thng qua Media

Gateway Controller, thao tc cc tn hiu iu khin gi trn IP (nh H.323, SIP) thng

qua cc Packet Manager.

Giao din m d dng giao tip v m rng: Vi giao din m Surpass hiQ 9200 c

kh nng giao tip vi tt c cc thnh phn trong mng, trong quan trng nht l giao

din bo hiu v iu khin, ngoi ra cc giao din vi mng qun l v mng d liu gi

cng rt quan trng trong vic qun l mng ca cc nh khai thc mng.

H tr cc giao thc chun MGCP, MEGACO/H.248: Vi cc giao din h tr nycung cp cho hiQ 9200 kh nng lin kt bo hiu tc cao, gim st qun l bo hiunhm ti u ha ti nguyn mng..

hiG

hiQ 20hiQ 30

hiQ 4000

hiG

hiQ 9200

hiS

SC I

MGCPMEGAC

H.323

IP

INAPoverTDM

H.323 / SIP

Open API forexternal applications

H.323 / SIPEndpoints

INAPoverIP

LDA

MGCP

MEGAC

MGCPMEGAC

hiR

MGCP/MEGAC

MGCP/ MEGACOEndpoint

SS7

ISU

SS7 over IP

BICC overSS7oIP

ACPMGCP

SS7 over TDM

BICCover TDM

SS7 over

TDM

hiQ 6200

SIPSIPhiA

SSSS77SwitchSTP

SSSS77Switch STP

S

E

M

E

N

SN

X

DO

R

F

SEMENSNXDORF

Giao din bo hiu ca Surpass hiQ 9200


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1.5 Kin trc phn cng ca Softswitch HiQ 9200:

Cc khi phn cng ca Softswitch HiQ 9200.

a. Khi iu khin gi (PCU).

Nn tng phn cng ca mt PCU gm cc bn mch MGI (MGI Board) c cm vomt MGIC-LTG, MGIC-LTG ny ng vai tr nh ng kt ni vt l v logic gia MGIBoard v CC-LTG.

* MGI Board c mt b thch nghi SIPAC v c cm vo mt gi LTGN. Giao dinGP-BUS l mt BUS 8 bit v c dng truyn d liu gia MGI Board v GP Board.

MGI Board c trang b mt giao din Ethernet dng lin lc vi cc MG khc

nhau thng qua mng TCP/IP. MGI cng c trang b mt b x l Motorola P C860MHvi 32 Mbytes SDRAM v 8 Mbytes FLASH EPROM dng lu tr cc chng trnh cs.

GP-BUS cho php mt lung gi liu tc bit cao gia MGI Board v MGI-LTG.

* Mi MGI Board c cm vo mt MGIC-LTG. MGIC-LTG c coi l ng ktni vt l gia MGI Board v cc CC-LTG-LTG khc nhau. MGIC-LTG l mt LTG ca

phn cng loi LTGN c to ra gm hai loi l LTG B hoc C v c ti mt phn cbit h tr chc nng ca MGIC. LTGN c trang b mt GP, GS v DIU 120. Cc DIU


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khng c dng cho chc nng giao tip MG m chng c s dng cho mt s chcnng khc.

b. CC- LTG.

Call Control LTG (CC-LTG) l mt LTG ca phn cng loi LTG N vi b nh 128Mbyte, c cu hnh thnh LTG B hoc LTG C v c ti mt phn mm c bit. LTGny h tr chc nng iu khin cuc gi v hot ng nh mt Call Feature Server choVoice Online.

CC-LTG c s dng kt ni:

- Cc trung k o

- Cc thu bao H.323 vi tp tnh nng y hoc rt gn.- Cc thu bao H.323 gc.

S CC-LTG v PCU cn thit tu thuc vo mi kch bn c h tr bi HiQ 9200 vti lu lng o hay theo gi thit.

c. SNMP.

SSNC cung cp cc chc nng MTP (phn truyn bn tin) v SCCP (phn iu khinkt ni bo hiu), cng nh OMAT (phn ng dng, vn hnh v bo dng).

Do s dng cng ngh ATM v cc phn cng mi nht, SSNC c dung lng v tc rt ln.

d. CP.

- S dng h thng a x l cu trc Module hot ng theo nguyn tc chia s ti.

- Ph hp vi cc kch thc khc nhau ca tng i tu theo dung lng: CP 113Cc dung lng 4 triu BHCA (CP 113E c dung lng 12 triu BHCA).

- C kh nng d phng nh s dng cu trc kp i vi nhng khi chc nng

quan trng.- S dng cc b vi x l c tnh nng cao.

- B nh chung c dung lng l : 64MB n 1024MB i vi CP 113C v 512MB n2048MB i vi CP 113E.

- B nh ca mi b x l c dung lng ti a l 64MB i vi CP 113C v 256MBi vi CP 113E.


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1.6 Chc nng phn mm ca cc khi Softswitch HiQ 9200

Cu trc chung phn mm ca Softswitch HiQ 9200.

a. Cc chc nng phn mm ca CC- LTG.

Transfer Program 1 TP1 (chng trnh truyn dn 1).Nhim v ca TP1 l truyn thng tin iu khin phng tin gia nhm trung k

ng dy iu khin cuc gi (CC-LTG) v nhm trung k ng dy iu khn giao dincng phng tin (MGIC - LTG). D liu gia CC-LTG v MGIC - LTG c trao inh bn tin R:MGIC_DATA.

TP1 l mt chng trnh ngi dng vi s mc ni gia trng thi v s kin. N chai i tc giao tip trn CC-LTG l MCU v CCI. Trn MGIC - LTG, chng trnh ngidng TP2 giao tip vi TP1. Giao din gia TP1 v TP2 l mt giao din thng bo.

Media Control Unit MCU (khi iu khin phng tin).

Media Gateway c iu khin thng qua giao thc MGCP. Cc bn tin lin quanc to ra bi ngn giao thc MGCP do CA iu khin. MCU thit lp mt giao din knhmang n MGI Board, n CA v ngn giao thc MGCP. Giao thc hot ng trn MCUc tng thch vi nhng yu cu ca MGCP.

Call Control Interface CCI (giao din iu khin cuc gi).


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Vic truy nhp ca thu bao H.323 vo mng yu cu cn phi c mt giao din iukhin cuc gi. Chc nng ca giao din iu khn cuc gi (CCI) ny bao gm:

+ CCI thit lp mt giao din vi cc chng trnh ngi dng V5.2/DSS1. Ngi dngISDN hot ng bn A ca mt qu trnh thit lp cuc gi s nhn c thng tin bohiu thng qua PCU v CCI m khng qua knh D ca mt truy nhp c bn.

+ Chuyn tr truyn dn cho CA (ch vi H.323 RFS v Pure).

Con ng lin lc ny cng c s dng mang thng tin v v tr ca MediaGateway v chuyn tr cho cc CA.

Media Control Application MCA (ng dng iu khin phng tin).

MCA chu trch nhim truyn thng tin c lin quan n iu khin phng tin giacc MGC v truyn thng tin iu khin phng tin gia CC-LTG bn A v CC-LTG bnB.

MCA gii phng giao tip gia ngi iu khin giao thc ng dng (APH -Application Protocol Handler) mt pha v MCU/CCI pha cn li.

MCA s dng cc quy tc m ho nhn c t chun Q.765.5 C cu truyn dn ngdng - iu khin cuc gi khng ph thuc knh mang (BAT ASE).

Tuy nhin vic m ho v gii m khng c thc hin trn CC-LTG m thc hintrn CA nm trn MGI Board. Thng s ton b l tunneled - nh l d liu trong sut tmt CA n mt CA khc (t CA - A n CA - B).

MG- ISUP/MGC- ISUP.

MGC-ISUP c s dng cho lin lc gia cc MGC cn MG - ISUP iu khin giaodin gia MGC v MG.

MGC-ISUP / MG-ISUP khng iu khin trc tip knh mang m ch iu khin thngtin bo hiu.

Do , MG:ISUP khi u lin lc vi MCU m c cung cp giao din n CA nmtrong PCU thay v vic gi chng trnh chuyn mch theo nhm.

Tng tc gia bo hiu TDM (CAS, SS7, ANIS v ISDN) vi bo hiu cuc gi IP(nh MG-ISUP hay H.323) l c th thc hin c. Vic tng tc phi c thc hin

bng vic quay vng t LTG trung k TDM n mt LTG trung k MG. Knh thoi ctruyn trc tip n mt Media Gateway, cn knh bo hiu c gi trong MGC. Nhnhn c bn tin M:DIGIT_BLOCK th CP c th xc nh c kiu ca bn A v bn


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B, nu mt trong hai kiu khng phi thuc loi IP (trung k TDM hoc thu bao H.323Pure hay RFS) th mt vng LTG ISUP phi c lin kt ni.

b. Cc chc nng phn mm ca PCU.

Hnh 2.5: Cc thnh phn phn mm ca PCU.

Transfer Program 2- TP2.

TP2 thit lp giao din gia CC-LTG/CP v MGI Board. Mt pha ca cc giao din lb m thng bo cn pha kia l GP - BUS m MGI Board c kt ni n.

TP2 cung cp vic truyn dn n gin v d dng nh tuyn gia CC-LTG, CP vMGI Board.

Cc kt ni tch bit gia CP vi TP2 v gia TP1 vi TP2 khng c gim st. Cclnh, cc bn tin v cc thng bo trao i thng qua giao din TP2.

Transfer Program 3 TP3.

Nhim v ca TP3 l gi lnh cho GP BUS nhn c n cc ng dng tng ngv gi mi lnh nhn c ban u t ng dng bt k n MGIC - LTG.

Media Control Unit (MCU).

Khi iu khin truyn dn (MCU) trn MGI Board mt bn sao MCU trong CC-LTG.Cc nhim v chnh ca n l:

- gi li lnh iu khin phng tin nhn c ban u t CC-LTG qua TP3 chotrng hp tc nhn kt ni thch hp.


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- gi li lnh iu khin phng tin nhn c ban u t trng hp tc nhn ktni cho n CC-LTG MCU qua TP3.

gi li lnh nhn c ban u t MGI-Control n cc trng hp tc nhn kt nic quan tm.

Khi iu khin MGI- MGIC.

MGIC c th c chia thnh hai khi thc hin cc tc v sau:

- Bo dng MGI.

S gim st v iu khin ca GP-BUS.

Truyn dn cc bn tin bo dng MGCP n v t MG / MGIF SW ca CP

Filtering ca cc bn tin bo dng t MG.

- Vn hnh v qun l cho MGI

Cu hnh c bn ca th tc khi ng h thng.

H tr SNMP

Qun l phn mm MGI

SNMP.

SNMP p ng cho phn qun l d liu na c nh ca d liu MGI c tn l d liuMIB. D liu MIB c th c sa i ti mi thi im.

Call Control Interface (CCI).

Giao din iu khin cuc gi (CCI) bao gm cc phn khc nhau cho php lin lcgia iu khin cuc gi H.323 v ngi dng DSS1 ca CC-LTG.

Connection Agent (CA).

CA thit lp ng kt ni n MG hoc n thu bao H.323. N phi hp cc phn x

l cuc gi chy trn MGI Board.CA ch iu khin mt mt pha ca cuc gi (half call). Vic phi hp vi pha

cn li c thc hin bi CC-LTG. Nh m cc CA c th c nh v vt l trncng mt MGI Board hoc trn cc MGI Board khc nhau.

CA giao tip vi MCU hoc CCI v vi MG hoc thu bao H.323. Giao din vi MGc trnh by bi MGAP (im truy nhp MG) tng ng vi lung d liu gia ContextControl v MG. Giao din vi cc thu bao H.323 c trnh by bi iu khin cuc gi


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H.323, giao din ny tng ng vi thng bo trao i gia Context Control v chng giaothc H.323.

Mt giao din n CP s c yu cu khi mt thng bo thit lp cuc gi t thu baoH.323 c nhn trn MGI Board v CA phi xc nh CC-LTG c tc ng bi cc cs d liu CP u vo.

+ Qun l ti nguyn

Phn qun l ti nguyn c yu cu cho vic qun l v cho cc trng hp x l btbuc.

Trong qu trnh thit lp v gii phng cuc gi th DSS1 CC, Context Control v

H.323 Call Control c gi v c gii phng nh cc khi phn mm tng ng. Khiqun l ti nguyn h tr cc chc nng ny.

+ im truy nhp cng phng tin - Media Gateway Access Point (MGAP):

MGAP c p ng cho cc lung d liu gia Context Control, MEGACO/H.248 vMGI Control. MGAP iu khin cc t gc c gi bi Context Control v MGI Controlv phn phi cc lnh.

MGAP thu thp cc s kin t Context Control v xy dng nn mt giao dch H.323,sp xp vo mt bn tin MGCP trong chng giao thc MGCP.

thit lp mt kt ni trung k trn MG, CC-LTG s truyn mt xc nhn trung kTDM nh sau:

name1/[email protected]

v tun theo lut c SMTP.

MGAP phi c kh nng chuyn i MG domain nhn c sang a ch IP ca MG.Cc d liu ny c th c tm thy trong mt bng c qun l bi SNMP trn MGIBoard.

+ H.323 Call Control

H.323 Call Control c yu cu mt pha ca cuc gi. H.323 Call Control p ngcho vic chuyn i bo hiu cuc gi H.323 gia MGI Board v thu bao H.323. H.323Call Control c cc chc nng sau y:

- Nhn ly mt Context Control cho mt thit lp cuc gi nhn c t thu baoH.323.


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- iu khin vic thit lp v gii phng cuc gi pha truy nhp H.323 thng quamt giao din thng bo chnh n chng giao thc H.323.

- Trao i cc thng tin kt ni vi Context Control ca pha i tc.

- Truyn cc thng bo DSS1 theo ng hm iu khin cuc gi n v i chothu bao H.323 vi chng giao thc DSS1.

+ Context Control

Phn chc nng chnh bn trong CA l Context Control (COX), COX lm vic nh mtkhi tng tc gia iu khin cuc gi DSS1 v iu khin cuc gi H.323. Cc bn tin

bo hiu cuc gi c nhn t DSS1 Call Control hay H.323 Call Control v c gi n

Call Control tng ng pha bn kia.+ Port Allocation:

thit lp mt cuc gi H.323 bn A, CA nhn mt bn tin SETUP thng quaH.323. Bc tip theo l phi nhn mt cng thu bao, cng ny nm trn khi CC-LTG.Do vic iu khin kt ni phi ch nh mt CC-LTG, mt giao din V5.2 v mt scng V5.2 s dng cho vic iu khin x l cc cuc gi xa. Hn na, vic iu khin ktni i hi thng tin v kiu thu bao H.323 (Pure - RFS hay FFS) v cc hot ng sau s ph thuc vo loi thu bao (knh mang c i qua HiQ 9200 hay khng).

ginh c thng tin cn thit, khi iu khin kt ni to ra mt bn tin CPQuery, cc bn tin ny mang s thu bao E.164 ca thu bao ang gi. Bn tin ny ctruyn n cng ch nh, v tip tc c gi n CP qua TP3.

Nu mt CC-LTG b hng, CP s cung cp mt CC-LTG th hai (d phng) trong bntin p ng CP. Nu c hai CC-LTG u b hng, CP s cung cp a ch ca mt LTGkhng hot ng. Bn tin SETUP tip theo n CC-LTG c li v yu cu cuc gi H.323c gii phng hng ngc li.

Ngn giao thc MGCP.

Ngn giao thc MGCP cung cp giao din Media Gateway Controller gm mt tp cclnh iu khin kt ni v iu khin cc im ch. Trong phn gii thiu MGCP, hai loicu lnh c nh ngha:

- iu khin lin quan n CA (Create, Modify, Dolete, Notify NotificationRequest).

- iu khin lin quan n Gateway (RestartInProgress, AuditEndpoint,AuditConnection).

Chng c truyn qua UDP.


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Ngn giao thc H.323.

Ngn giao thc cung cp chc nng li thit lp v gii phng cc cuc gi v iu

khin phng tin thng qua giao thc H.245 nh mt th tc kt ni nhanh.


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CHNG 2: GII THIU V TRUNG K O V CC GIAO THCBO HIU S DNG TRONG GII PHP TRUNG K O

2.1 Gii thiu v mng trung k o:

C nhiu dch v thoi tin tin da trn cc dch v logic tp trung trong mng thngminh - Intellingent Network, cc thng bo dch v v cc hi thoi tng tc vi thu bao.

Nh gii php SURPASS Virtual Trunking cc dch v v cc kh nng ny lun sn sngtrong mng ng trc VoIP. SURPASS HiQ 9200 c chc nng nh mt im chuynmch dch v (Service Switching Point - SSP) v ng thi cng thc hin chc nng mtim iu khin dch v (Server Control Point - SCP). kch hot cc thng bo v cc

hi thoi tng tc ngi dng, SURPASS HiQ 9200 nh hng cuc gi n mng IPnh my ch ti nguyn thoi SURPASS HiR 200.

MG c iu khin bi cc MGC ring ca n cho vic thit lp mt kt ni thi gianthc RTP (Real-time-Transport-Protocol) to thnh mt trung k o xuyn qua mngIP. Mt giao thc iu khin MG chun c s dng gia SURPASS HiQ 9200 vSURPASS HiG 1000/1200 l MGCP v c h tr bi giao thc MEGACO theo chunH.248 ca ITU.

i vi mng trung k o, SURPASS HiQ 9200 thc hin:

+ iu khin Media Gateway bng giao thc MGCP/MEGACO.

+ Chc nng cng bo hiu cho kt ni vi mng bo hiu s 7.

+ Cc tnh nng trung k.

MG SURPASS HiG 1000/1200 l mt phn ca h sn phm SURPASS cho thoi lptruyn thng v cc dch v thoi/d liu da trn cc mng gi v cung cp mt cng cth thay i t l cho hi t thoi - d liu. N cung cp y cc chc nng ca mt cngVoIP, cc cng VoIP ny gi vai tr trung tm trong cng ngh mi ny, n iu khin vic

chuyn i d liu thoi sang cc gi IP v ngc li.y l gii php m SURPASS a ra cho cu trc v cc ng dng ca mng truyn

ti li (core), ng trc (backbone). Gii php ny cho php mng vn hot ng tt khimng c m rng v phc v cho mt lu lng ln hn, v thoi v d liu s c tchhp trn mt c s h tng duy nht.

c im ni bt ca gii php trung k o l n c kh nng tnh ton tt c thng squan trng ca mng, bao gm: s kt ni ti a c th phc v cng lc, cung cp c tnhcho tng thu bao, s linh hot v bng thng (bng thng c cung cp khc nhau tu


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Gi (Package): l mt nhm cc tn hiu v s kin c s dng trong qu trnh thchin mt cuc gi. Mt s gi c bn: thng tin chung (Generic media - G), s DTMF (D),Handset (H), ng dy (Line - L), trung k (Trunk - T), my ch truy nhp mng(Network access server - N), my ch thng bo (Announcement server - A),

C php ca cc lnh v p ng trong MGCP:

Lnh:

nh dng ca mt lnh (command) bao gm :Command header v cc thng s

Command header c dng nh sau:

MGCPVerbTransaction _id EndpointNameMGCPVersion EOL(MGCPparam)

Trong :

o MGCPVerd : l m ca cc lnh c s dng trong MGCP.Bao gm cc m lnh nh sau:

Create Connection CRCX: l lnh MGC truyn n MG yu cu tokt ni gia cc Endpoint.

Modify Connection MDCX: truyn t MGC n MG. Lnh ny cs dng khi c tnh ca kt ni cn thay i.

Delete Connection DLCX : c MGC v MG u c th s dng lnhny yu cu xa kt ni. MG s dng lnh ny trong trng hp ng

dy b h hng.Request Notification RQNT: truyn t MGC n MG. MGC yu cu

MG ch n mt s kin no .

Notify NTFY : truyn t MG n MGC nhm thng bo cho MGC khic mt s kin xy ra.

Audit Connection AUCX : y l lnh MGC gi n MG ly ccthng s lin quan n kt ni.

Audit Endpoint AUEP : MGC gi lnh ny n MG xc nh trngthi ca im cui.

Restart in Progress RSIP : y l yu cu ca MG gi n MGC bo hiu cho MGC bit im cui khng hot ng (out of service).

Lu : Cc m lnh phi c vit bng ch in hoa.

o Transaction_id: s xc nh ca mt tng tc, dng phn bit viResponse. N c gi tr t 1 n 999 999 999 v c hai loi transaction_id l sxc nh tng tc hng i v s xc nh tng tc hng v.

o EndpointName: dng xc nh im cui, n bao gm hai phn ltn min ca Gateway qun l im cui v tn cc b trong Gateway .


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2.3 Giao thc bo hiu SIGTRAN Signaling Transport Protocol (SS7 over

IP):Nhim v chnh ca giao thc SIGTRAN l dng truyn thng tin bo hiu SS7 ca

mng PSTN qua mng IP. y l mt giao thc truyn ti mi c xy dng thay thcho giao thc TCP (Transmission Control Protocol) trong vic truyn tn hiu SS7, hay cngi giao thc ny l SS7 over IP..

SIGTRAN ra i nhm thay th cho TCP v giao thc TCP c mt s hn ch nh :

- Cc c ch truyn m bo s tin cy: TCP l giao thc cung cp vic truyn d liutin cy. Vic ny c thc hin thng qua c ch xc nhn v c ch tun t. Mt s ngdng cn s truyn tin cy nhng khng cn s h tr ca 2 c ch trn nn vic s dng

TCP trong nhng trng hp ny s gy ra tr.- Yu cu thi gian thc:Vi vic gy ra tr khng cn thit do s dng cc c ch

trn lm cho TCP khng thch hp vi cc ng dng thi gian thc.

M hnh chc nng:

M hnh chc nng ca SIGTRAN bao gm 3 thnh phn nh sau:

M hnh chc nng ca SIGTRAN

Chc nng chnh ca SIGTRAN l truyn bn tin bo hiu s 7 gia Signaling Gatewayv Media Gateway Controller qua mng IP.

Ch : c nhiu giao thc thch ng (Adaptation protocol) c nh nghanhng ti 1 thi im ch c duy nht 1 giao thc c s dng.

Giao thc SCTP (Stream Control Transport Protocol):

SCTP l giao thc hng kt ni cng cp vi giao thc TCP c chc nng cung cpvic truyn cc bn tin mt cch tin cy gia cc ngi s dng SCTP ngang cp.


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Chc nng ca SCTP.

Trong :

Association startup & teardown: Association trong thut ng SCTP c hiul mt kt ni c thit lp gia 2 im cui trc khi thc hin vic truyn d liungi dng (do SCTP l giao thc hng kt ni). Mi im cui SCTP c xcnh bi 1 a ch IP v s th t cng.Chc nng ny c kch hot to ra mtkt ni khi c yu cu t ngi s dng SCTP.

Sequenced delivery within streams:c s dng xc nh ti thi imkhi to tng s dng v s th t dng d liu (data stream) ca ngi dng trnmt kt ni. Mi dng l mt knh logic mt chiu.

User data fragmentation: Nhim v ca chc nng ny l phn on v tphp bn tin ngi dng .

Acknowledgement & congestion avoidance: Mi bn tin ngi dng ( cphn on hay cha) u c SCTP gn mt s th t truyn TSN (Transmissionsequence number). Ni nhn s xc nhn tt c TSN nhn c k c khi s thnhn khng lin tc.


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Chunk bundling: Mt gi SCTP bao gm mt header chung v mt hay nhiuchunk. Cc loi chunk bao gm ti d liu, khi to, kt thc,

Packet validation: Dng kim tra gi SCTP thng qua trng xc nhn v32-bit checksum.

Path management: Dng chn a ch truyn ch cho mi gi SCTPtruyn i da trn lnh ca SCTP user v trng thi ca ch n.

Cu trc ca gi SCTP:

Cu trc ca gi SCTP

nh dng header chung ca gi SCTP

Vi:

Source/Destination port number: 16 bits ny dng xc nh cng ca ngigi v ngi nhn SCTP.

Verification tag: bn nhn gi ny s dng trng ny kim tra s hp lca ngi gi.

Checksum: 32 bits ny dng cha kt qu checksum ca gi SCTP.


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Adaptation Protocol (xPA, xUA):

M2PA (Message Transfer Part 2 Peer-to-Peer Adaptation): M2PA h tr vic truyn

bn tin SS7 lp MTP3 qua mng IP. Signaling Gateway s dng giao thcthch ng ny ng vai tr nh mt nt trong mng SS7. M2PA c chc nng tng t

nh MTP2.

M2UA (MTP2 User Adaptation): M2UA cng c s dng truyn bn tin lpMTP3 nhng Signaling Gateway s dng n khng phi l mt nt mng SS7.

M3UA (MTP3 User Adaptation): M3UA dng truyn bn tin ca ngi dng lpMTP3 (nh bn tin ISUP, SCCP). Lp ny cung cp cho ISUP v SCCP cc dch v caMTP3 ti Signaling Gateway xa.

SUA (SCCP User Adaptation): SUA nh ngha giao thc truyn bn tin bo hiu ca

ngi dng lp SCCP (TCAP, RANAP). SUA cung cp cho TCAP cc dch v ca lpSCCP ti Signaling Gateway xa.

2.4 Giao thc RTP (Real Time Transport Protocol):

RTP l giao thc dng truyn cc thng tin yu cu thi gian thc nh thoi v hnhnh. RTP v giao thc h tr RTCP (Real Time Control Protocol) l cc giao thc hotng trn lp UDP.

Bn thn RTP khng thc hin mt hot ng no lin quan n s m bo cht lngca thng tin cn truyn ti c yu cu v thi gian thc. N ch n gin cung cp y thng tin ln ng dng lp cao hn lp ny a ra quyt nh hp l d liu vi mccht lng yu cu c x l nh th no.

Cc bn tin RTCP c trao i gia thnh phn s dng phin nhm trao i thngtin phn hi v cht lng ca phin lm vic.

Hai thnh phn chnh m RTP a cho lp trn lp ny quyt nh cht lng truynca cc loi thng tin trn l: s th t ca gi truyn (sequence number) v thi giantruyn ti a ca mt gi (timestamp).

Cu trc gi RTP:

Cu trc gi RTP.

RTP payload l phn cha d liu cn truyn i.

RTP header c cu trc nh sau:


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RTP Header.

Trong :

o V (Version): cho bit phin bn ca giao thc RTP c s dng.

o P (Padding): bit ny cho bit trong gi RTP c s dng chn bit 0 haykhng. Ta s dng chn bit ny sau phn payload khi thng tin c trong phn tikhng lp y phn RTP payload cho trc.

o X (Extension): cho bit header c c m rng ra thm hay khng.V trong mt s ng dng, phn header m rng c thm vo gia phn headerc nh v phn ti (payload).

o CC (Count of Contributing sources): cho bit s lng dng d liuc ghp chung vo 1 gi. Thng thng vic ghp cc dng thng tin cthc hin khi c nhiu user tham gia vo mt phin lm vic (v d nh hi nghtruyn hnh video conference) v CC dng xc nh s ngi tham gia hingh.

o M (Marker): c s dng khi c ng dng yu cu nh du ti 1im no trong dng d liu.

o PT (Payload Type): cho bit kiu d liu c truyn i.

o Sequence number: cho bit s th t c truyn i ca gi. S th tca gi u tin c truyn i trong mt phin hot ng l mt s ngu nhinbt k. Nh vo s th ny m ta s xc nh c gi no b mt v cc gi cn ng th t hay khng.

o Timestamp: cho bit thi gian m octet u tin c ly mu. Bnnhn s dng thng s ny xc nh mnh c th thc hin c yu cu phtthng tin c gi c m bo thi gian thc hay khng. Nu khng th n s

pht li thng tin (playback).


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o Synchronising Source (SSRC) Identifier: l s nhn dng ca ni gcpht d liu.

o Contributing Source (CCRC) Identifier: l s nhn dng ca cc nipht d liu cng tham gia vo phin lm vic vi SSRC.

2.5 Bo Hiu H.323:

H.32x l h giao thc ca ITU-T nh ngha cc dch v a phng tin qua cc mngkhc nhau v H.323 l mt phn trong h ny.

H.323 l giao thc xc nh cc thnh phn, cc giao thc cng nh cc bc thc hin cung cp dch v a phng tin qua mng gi. Cc dch v a phng tin y c thl truyn tn hiu ting, tn hiu hnh thi gian thc v d liu. Mng gi c th l Internet,EN (Enterprise Network), LAN (Local Area Network), MAN (Metropolitan Area

Network), WAN (Wide Area Network).H.323 c th cung cp 1 trong 3 loi dch v l ting, hnh hay d liu cng nh t hp

cc dch v trn nn n c th c ng dng nhiu ni nh ng dng ti nh khchhng, doanh nghip hay cng nghip gii tr. Ngoi ra n c th c s dng cung cpdch v a phng tin a im (multipoint multimedia communications).

Chng giao thc ti u cui H.323

Cc giao thc thuc H.323:

Cc giao thc m ha v gii m cho thoi gm c: G.711 (64kbps), G.722 (64, 56 v48kbps), G.723.1 (5.3 v 6.3kbps) v G.729 (8kbps).

Cc giao thc m ha v gii m cho tn hiu hnh bao gm: H.261 v H.263.

Giao thc bo hiu RAS (H.225.0):

Giao thc RAS (Registration, Admission and Status) l giao thc c s dng thchin vic ng k, qun l vic tham gia ca cc im cui, thay i bng thng, trao itrng thi v loi b ng k gia cc im cui vi GK. Cc bn tin RAS s c trao iqua knh bo hiu RAS v knh bo hiu ny s c thit lp u tin trc khi cc knh


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khc c thit lp. Ngoi ra, cc bn tin RAS c truyn qua giao thc UDP khng tincy nn vic trao i cc bn tin ny c th b timeout v dn n vic chng s c phtli. Cc bn tin RAS truyn qua UDP nh cc cng 1718 (multicast) v 1719 (unicast).

Ch : cc endpoint y c th l Gateway hay terminal.

Cc bn tin RAS c 3 loi:

Yu cu (request) : xRQ.

Xc nhn (confirm) : xCF .

T chi (reject) : xRJ.

Bo hiu H.225 RAS c cc bn tin c bn nh sau:

o Tm kim GK hay xc nh GK (Gatekeeper discovery): gip endpoint

xc nh GK iu khin n. Qu trnh ny c th c thc hin ng hay tnh.i vi qu trnh xc nh tnh th im cui bit trc a ch truyn ti(transport address) hay a ch mng ca GK qun l n. i vi qu trnh xcnh ng th im cui s pht i bn tin multicast GRQ (Gatekeeper discoveryRequest) tm GK iu khin mnh. Cc GK s phn hi bng bn tin GCF(confirm) tr li cho bn tin trn nu n chnh l GK iu khin ca im cui. Ngc li n s p ng bng bn tin GRJ (reject). C th c 1 hay nhiu GKl GK iu khin ca im cui a ra yu cu.

o ng k im cui (Endpoint Registration): qu trnh ng k ccc im cui s dng tham gia vo mt vng hot ng ng thi n thng

bo cho GK qun l n a ch truyn ti cng nh b danh (alias) ca mnh.im cui mun ng k n 1 GK no s gi bn tin RRQ (RegistrationRequest). Nu GK ng cho im cui tham gia vo mng s p ng cho imcui bng bn tin RCF (confirm). Nu khng th im cui s nhn c phnhi RRJ (reject) v n s khng c GK cung cp bt c mt dch v no.

o Xc nh v tr ca im cui (Endpoint Location): y l qu trnh xcnh a ch truyn ti ca mt endpoint trong trng hp ch bit b danh ca n.C GK hay im cui c th thc hin chc nng ny. Bn c yu cu xc nhim cui s pht bn tin LRQ (Location Request). Ni nhn yu cu c p ng

c hay khng th hin qua bn tin phn hi LCF (confirm) hay LRJ (reject).o iu khin vic tham gia (Admission control): y l qu trnh xem

xt s cho php tham gia ca mt endpoint no vo mt phin lm vic. utin, endpoint mun tham gia vo phin lm vic th n s gi yu cu n GKqun l n bng mt bn tin ARQ (Admission Request). Nu GK chp nhn thn s p ng bng bn tin ACF (confirm), ngc li th bn tin ARJ (reject) sc tr v.

o Thot khi kt ni (Disengage): khi c 1 im cui mun thot khimt kt ni th n s gi n GK bn tin DRQ (Disengage Request). Nu yu cu


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trn c ng n s nhn c p ng DCF (confirm), ngc li s nhnc DRJ (reject).

o S thay i bng thng (Bandwidth change): y l chc nng yu cuthay i bng thng cho mt kt ni no , c th c yu cu bi endpointtham gia kt ni hay GK. Bn mun thay i bng thng s pht ra bn tinBRQ (Bandwidth Request). Bn nhn yu cu ny nu chp nhn s phn hi

bng bn tin BCF (confirm), ngc li s p ng bng bn tin BRJ (reject).

o Trao i thng tin trng thi (Status hay cn gi l Information): l qutrnh c s dng bi GK v endpoint endpoint thng bo cho GK cc thngtin trng thi ca mt kt ni no . Khi GK mun bit thng tin trng thi vcuc gi no n s gi bn tin IRQ (Information Request). Endpoint gi trcc thng tin chi tit v cuc gi yu cu bng bn tin phn hi l IRR

(Information Response).o Ngoi ra trong bo hiu RAS cn c mt s chc nng sau: qu trnh

loi b ng k ca mt im cui ra khi vng hot ng v s qun l ca 1GK (Unregistration). Qu trnh ny l qu trnh ngc li vi qu trnh ng k,v cc bn tin c th c trao i khi thc hin chc nng ny l URQ(Unregistration Request), UCF (confirm), URJ (reject). Ngoi ra im cui c th

bit kh dng ca ti nguyn (xem ti nguyn n s dng n gii hn chophp hay cha) bng cch gi bn tin RAI (Resource Availability Indicate). GKs phn hi bng bn tin RAC (Resource Availability Confirm). Mt chc nngkhc na l kch hot mt s loi dch v c bit bng bn tin SCI (Service

Control Indication). Bn tin phn hi l SCR (Service Control Response). Chcnng ny c s dng bi c cc im cui v GK. Mt s bn tin chc nngkhc c s dng trong cc trng hp c bit l Unknown MessageResponse v Non-standard Message.

Giao thc bo hiu cuc gi H.225.0:

y l giao thc h trc cc chc nng bo hiu cho mt cuc gi, c s dng thit lp knh kt ni gia cc endpoint. Qu trnh trao i cc bn tin bo hiu cuc giH.225.0 c thc hin qua knh bo hiu cuc gi, l knh truyn tin cy s dng giao

thc TCP.Cc bn tin H.225.0 c trao i trc tip gia cc endpoint nu khng c GK trong

mng H.323. Nu trong mng c GK, cc bn tin ny c th c truyn trc tip gia ccendpoint hay c truyn thng qua GK ti cc endpoint. Cch thc truyn s c xcnh trong qu trnh thc hin bo hiu RAS, qua bn tin tham gia cuc gi.

Cc bn tin c bn bao gm:


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Bn tin SETUP: c s dng khi mt im cui mun thc hin mt kt nivi mt im cui khc. Nu n s dng cch thc truyn thng qua GK th mun

pht bn tin ny i trc ht n phi nhn c bn tin ACF ca GK.

Bn tin CALL PROCEEDING: bn tin ny cho bit bn tin SETUP cnhn v th tc thit lp cuc gi ang c tin hnh.

Bn tin ALERTING: im cui b gi s pht bn tin ny cho bit n angc cnh bo c 1 cuc gi n n.

Bn tin CONNECT: c pht i bi im cui b gi, nhm thng bo n chp nhn cuc gi.

Bn tin RELEASE COMPLETE: bn tin ny dng kt thc cuc gi.

Ngoi ra cn c cc bn tin khc nh: bn tin PROGRESS, bn tin

FACILITY, bn tin STATUS, bn tin STATUS INQUIRY, bn tin SETUPACKNOWLEDGE v bn tin NOTIFY.

Giao thc bo hiu iu khin H.245:

Bo hiu iu khin H.245 dng trao i cc bn tin iu khin H.245 t u cuin u cui (end-to-end, khng phi l terminal) gia cc im cui H.323 (endpoint). Cc

bn tin H.245 c truyn trn knh iu khin H.245. Knh ny l knh lun l s 0 vlun lun c m (m thng trc).

Cc bn tin H.245 dng trao i v kh nng ca cc terminal v dng yu cum hay ng cc knh lun l. Lu cc knh lun l y l cc knh mt chiu.

C 4 loi bn tin H.245 l bn tin yu cu (Request), bn tin p ng (Response), bntin lnh (Command) v bn tin ch nh (Indication). Mt bn tin yu cu cn phi c ikm theo sau l mt bn tin p ng, trong khi bn tin lnh th khng nht thit cn c

bn tin p ng.

Cc chc nng chnh ca H.245 l :

Trao i kh nng (Terminal Capability Exchange)

Bo hiu knh lun l (Logical Channel Signaling)

Xc nh Master/ Slave (Master/ Slave Determination)

iu khin hi ngh (Conference Control)

2.6 Giao thc bo hiu iu khin SIP (Session Initiation Protocol):

SIP, c xy dng bi IETF, l mt giao thc bo hiu iu khin thuc lp ng dngdng thit lp, iu chnh v kt thc phin lm vic ca mt hay nhiu ngi tham gia.

SIP l mt giao thc n gin, da trn vn bn (text-based) c s dng h trtrong vic cung cp cc dch v thoi tng cng qua mng Internet.


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Cc chc nng ca SIP:

Xc nh v tr ca ngi s dng (user location): Hay cn gi l chc nng dch tn

(name translation) v xc nh ngi c gi. Dng m bo cuc gi n c nginhn d h u.

Xc nh kh nng ca ngi s dng: Cn gi l chc nng thng lng c tnhcuc gi (feature negotiation). Dng xc nh loi thng tin v cc loi thng s linquan n thng tin s c s dng.

Xc nh s sn sng ca ngi s dng: Dng xc nh ngi c gi c muntham gia vo kt ni hay khng.

Thit lp cuc gi: Chc nng ny thc hin vic rung chung, thit lp cc thng scuc gi ca cc bn tham gia kt ni.

X l cuc gi: Bao gm chuyn v kt thc cuc gi, qun l nhng ngi thamgia cuc gi, thay i c tnh cuc gi.

Cc thnh phn ca SIP:

Thnh phn chnh ca SIP l cc Agent v cc Server:

User Agent Client (UAC): Cn c gi l Calling User Agent. L mt ngdng khch (client) c chc nng khi to mt yu cu SIP.

User Agent Server (UAS): Cn c gi l Called User Agent. L mt ngdng ch (server) dng lin lc vi ngi dng khi nhn c yu cu SIP v sau

tr p ng v ngi s dng. Proxy Server: L chng trnh ng dng trung gian dng to yu cu SIP.

Cc yu cu ny c th c phc v ngay ti server hay c chuyn sang serverkhc sau qu trnh chuyn i tn. Proxy server bin dch v c th to li bn tinyu cu trc khi chuyn tip bn tin i. C 2 loi proxy server l proxy server cnh (stateful) v khng nh (stateless). Trong proxy server c nh l server ckh nng lu tr thng tin v mt yu cu v p ng ca n.

Location/Registration Server: L server c cc server cn li s dng ly thng tin v v tr ca ngi c gi.

Redirect Server: L server nhn yu cu SIP, sau tin hnh dch a chnhn t ngi dng sang a ch mi v gi tr v ng dng khch.

Bn tin v p ng trong SIP:

Cc bn tin bao gm:

INVITE: dng mi mt tham gia vo phin lm vic.

ACK: thng bo nhn c bn tin INVITE.

OPTIONS: c s dng khi c yu cu i vi server v vic xcnh c tnh cuc gi.


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BYE: thng bo cho server kt thc cuc gi.

CANCEL: Hy b yu cu va gi.

REGISTER: ng dng khch ng k a ch vi SIP server.Cc m p ng ca SIP:

1xx: Cho bit yu cu c nhn, ang x l yu cu gi n.

2xx: Thnh cng. Hnh ng c nhn thnh cng v c chpnhn.

3xx: Yu cu xc nh li. Mt s hnh ng cn c thc hin hon tt yu cu.

4xx: C li client. iu ny c ngha l trong yu cu c li c php

hay server khng th thi hnh yu cu. 5xx: C li server. iu ny c ngha l server b qu ti thi hnh

hay a ra yu cu.

6xx: Li ton cc. iu ny c ngha l yu cu khng th thi hnh bt c server no.


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CHNG 3: CC NG CNH THIT LP TRUNG K O, THIT LPCUC GI CALL FLOW TRONG HIQ9200

3.1 Thu bao PSTN n thu bao PSTN:

Thnh phn chnh trong qu trnh x l bo hiu trong mng th h mi NGN l MediaGateway Controller (MGC). S khc bit chnh gia MGC v tng i chuyn mch PSTNl vic x l kt ni knh mang. Trong khi cc mch TDM v cu trc ca chuyn mch l

tt c trong chuyn mch PSTN th MGC s dng mt giao din nghi thc iu khincc mch TDM trn Media Gateway (MG).

Chc nng ca SSNC nh l SS7 MTP, Call Control LTG (cn c gi l MCT)cung cp bo hiu ISUP v iu khin MG, CP c nhim v iu khin cuc gi (dch s,nh tuyn, tnh cc) .

Mi mt cng trung k trn hiG c mt nh trong CC LTG c to ra nh l mttrung k o. CP lin lc vi cc trung k o ny. CC-LTG phi iu khin Media gatewayhiG.

Tt c cc thnh phn x l trong Virtual Trunking u da trn phn cng ca tng i

EWSD. Tch hp thm Packet Control Unit (PCU) trong vic cung cp chng giao thcMGCP v kt ni vi mng IP. Chc nng ca PCU nh l mt cng cho php cc CC LTG lin lc vi hiG.

CP kt hp CC LTG v PCU cho vic truyn cc bn tin t CC LTG ti hiG, do khng v mt s lp li no gia CC LTG v PCU. Thng thng tt c cc PCU viMGCP Connection Agent c cng chc nng v c th kt ni vi tt c cc hiG.

Qu trnh thit lp cuc gi:

1. Tng i PSTN bn I cn chim dng mt ng trung k thit lp cucgi, n gi bn tin SS7:IAM ti MGC ca Softswitch hiQ 9200 vi s trung k CIC

(Circuit Identification Code). Thng tin tng ng ca trung k Media Gateway cqun l vi tn ca khe thi gian, v d nh : PCM1/[email protected].

2. S trung k ny c chuyn t tn hiu SS7 sang giao thc MGCP bi MGCca Softswitch hiQ 9200. Lnh CRCX (create connection) c gi t MGC ti MGthng qua mng IP.

3. Media Gateway (A) chim dng ng trung k TDM v mt cngRTP/RTCP trn mng IP bn I v gi a ch IP ca n ti MGC trong bn tin CRCXAck.


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4. Softswitch hiQ 9200 chim dng mt trung k ni gia Media Gateway B vtng i PSTN bn E, MGC gi mt bn tin IAM vi thng tin CIC ti Gateway v bocho tng i PSTN bn E bit c mt cuc gi n v truyn s thu bao b gi.

5. Thng tin v trung k TDM c chim dng, cng RTP/RTCP, a ch IPca MG bn I cng lnh CRCX c gi ti Media Gateway v tng i bn E.

6. a ch IP ca Media Gateway B v cng RTP/RTCP c gi ti MGC cahiQ 9200 bng lnh CRCX Ack.

7. Lnh MDCX c gi t MGC ti MG bn I bo cho n bit cc thng tinv Media Gateway bn E nh s cng RTP/RTCP.

8. Bn tin SS7 COT (Continuity Test) c truyn ti tng i PSTN bn E.

9. Tng i PSTN bn E gi bn tin ACM v ANM ti MGC ca hiQ 9200.

10. Bn tin ACM, ANM c truyn tip ti tng i bn I.

11. Lu lng RTP c truyn qua li gia hai Media Gateway.

Cuc gi gia hai thu bao PSTN.


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Qu trnh gii ta cuc gi:

Qu trnh gii ta cuc gi din ra khi mt trong hai thu bao tin hnh gc my, qu

trnh ny s din ra tip theo sau cc tn hiu thoi truyn qua lu lng RTP. C hai u lthu bao PSTN nn vic gii ta cuc gi din ra l nh nhau.

Trng hp di y l bn thu bao E gc my trc.

12. Bn tin SS7:Release (REL) c truyn t tng i PSTN bn E nhiQ 9200.

13. Softswitch hiQ 9200 truyn tip bn tin SS7:Release ti tng iPSTN bn thu bao I.

14. Bn tin SS7:Release Complete (RLC) c truyn t hiQ 9200 ntng i PSTN bn E bo kt thc cuc gi thnh cng. Nhm tng i PSTN

bn E cp tone ri cho thu bao ny.15. Bn tin xa kt ni MGCP:DLCX c gi t hiQ 9200 ti MG (E).

16. Bn tin xa kt niMGCP:DLCX c gi ti MG (I) t hiQ 9200.

17. Bn tin MGCP resp thng bo xa kt ni thnh cng t MG (E)gi v cho hiQ 9200.

18. Bn tin MGCP resp thng bo xa kt ni thnh cng t MG (I)gi v cho hiQ 9200.

19. Bn tin SS7: RLC (release complete) c truyn t PSTN bn I n

tng i hiQ 9200 bo kt thc cuc gi thnh cng. Kt thc qu trnh m thoigia hai thu bao.

Qu trnh bo hiu din ra trong Sotfswitch:

ISUP bn I nhn mt bn tin IAM v xng thit lp mt cuc gi (truynM:SIEZURE, M:DB). Sau qu trnh dch cc s din ra bnh thng, n nhn c tinC:SETUP_C c nhn.

CCLTG cung cp cho PCU thng tin ca MGTSAlias v yu cu thit lp mt ktni R:MGIC_DATA (create_con). D liu nhn c chuyn thng qua Connection Agentv giao din MGCP ti MG vi lnh MGCP:CRCX.

Thng s giaCOX v MGAP Ghi ch Thng s MGCP

Termid S nhn dng thit b Connection id

Trans id S nhn dng tng tc Trans id

Loc-payl-transparent-addr

a ch IP/RTP cc bcung cp b MG

Local_connection_descriptor


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PCU truyn bn tin R:MGIC_DATA(CREATE_CONNECTION_ACK vi d liu :a ch IP/RTP bn I, d liu CODEC, CONNECT tip theo) tr li CC LTG.

CC LTG truyn d liu nhn c trong bn tin R:SETUP_COMPLETE ti CC LTG bn E, ci mi va c chim dng bng C:SIEZURE_CBT.

MG:ISUP truyn bn tin O:IAM ti SSNC. Vic ny c bo li vi bn tinISUP:ACM khi gi thnh cng. Sau CC LTG truyn bn tin R:MGIC_DATA (yu cuCREATE_CONNECTION, a ch IP/RTP ca bn I, MG-TSAlias cha thng tin catrung k TDM bn E). MCU nhn d liu ny t Connection Agent truyn ti stack MGCP, y chuyn d liu c truyn ti MG thng qua bn tin CRCX.

Thng s trong MGCP:CRCX.

MG tr li li bng bn tin CRCX:ACK vi a ch IP/RTP ca bn I thng qua stackMGCP ti Connection Agent

Thng s ni s dnggia COX v MGAP

Ghi ch Thng s MGCP

TermidS nhn dng

thit bConnection id

Trans idS nhn dng

tng tcTrans id

Thng s giaCOX v MGAP Ghi ch Thng s MGCP

Trans id S nhn dng tng tc Trans id

chanid Khe thi gian TS S nhn dng Endpoint

Access id Lung PCM S nhn dng Endpoint

Media Gateway S nhn dng MG S nhn dng Endpoint

ctx id S nhn dng cuc gi

Put throughbothway

mode

Local_payl,transparent data

a ch IP/RTP cc b ccung cp bi MG

Local_connection_

descriptor


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Loc-payl-transparent-addr

a ch IP/RTP ccb cung cp b MG


Thng s trong CRCX:ACK

PCU truyn bn tin R:MGIC_DATA ( CRAETE_CONNECTIOM_ACK vi d liu l: a ch IP/RTP ca bn E, d liu CODEC, CONNECT k tip ) tr li CC LTG. CC-LTGchuyn d liu nhn c ti CC-LTG ca bn I.

CC LTG bn I by gi cung cp cho PCU bn I vi d liu nhn c t MG bng bn tin R:MGIC_DATA. D liu ny c truyn thng qua Connection Agent v giaodin MGCP ti MG trong lnh MGCP: MDCX. D liu ny s c truyn ti stackMGCP v c dch sang bn tin MDCX.

Cc thng s trong MGCP:MDCX

MG thng bo li vi bn tin MDCX:ACK

Thng s ni Ghi ch Thng s MGCP

Trans idS nhn dng

tng tcTrans id

Thng s trong MDCX:ACK.

Thng s ni Ghi ch Thng s MGCP

Trans idS nhn dng

tng tcTrans id

Term id Connection id

chanid Khe thi gian TS S nhn dng Endpoint

Access id Lung PCM S nhn dng Endpoint

Media Gateway S nhn dng MG S nhn dng Endpoint

ctx id S nhn dng cuc gi

Put through bothway mode

Local_payl,transparentdata

a ch IP/RTP cc bc cung cp bi MG



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PCU truyn bn tin R:MGIC_DATA ti CC LTG bn I, thng bo cho CC-LTG bnE vi bo co R:APM. By gi, mt yu cu O: COT c truyn ti SSNC, n truyn bntin ISUP:ACM ti tng i qun l thu bao I, qu trnh thit lp kt ni hon thnh vi bntin ISUP:ANM.

Qu trnh x l trong Softswitch (Bn I).

O:IA

M:SIEZURE_CM:B

C:SETUP

R:MGIC_DATA

R:MGIC_DATA(create_con_ack(MBA/BAT))

CRCX

R:MGIC_DATA(transparent_data(MCA/BAT))


COMUE:Create_con_ack(MCA/BAT) CRCX_A

MDCX AC

MDC

R:SUC(MCA/BAT)R:APM(MCA/BA

COMUE:(transparent_data(MCA/BAT))

R:APM(MCA/BAT(connected))

R:AC

R:ANSW

O:ACM

O:ANSWE

ISUP- TP CA/MC MG

PCUCC-


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Qu trnh x l trong Softswitch (Bn I) (tip theo).

ACK

Create_con

ADD _RQUchanID accessID

ADD_CNFctxtID

SIEZECOX

ADD RQU ctxt

ADD_RQU_MG(chanID, ccessID,MG, ctxtID,put_through_bothway)

Create_con_ack(transp_addr, codec,

connected_fw)

ADD_CNF( termID,Loc_payl_trsp_addr)

ADD_CNF_MG( termID,Loc_payl_trsp_addr,transID, ctxtID)

R:MGI_DATA(create_

Createconnection

R:MGI_DATAcreate con ac

ModifyConnectio

Transp_data(rem_payl_transp_ad

dr, codec,connected_fw+

notification)

MOD_RQU( termID,Loc_payl_trsp_addr)

MOD_RQU_MG( termIDs,ctxtID,codec,rem_payl_trans_addr,transID, put_through_bothqway)

Transp_dataconnected

MOD_CNFMOD CNF M

R:MGI_DATA

COX MGAP MGCPMCU

R:MGI_DATA(transp_data)


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Qu trnh bo hiu trong Softswitch (Bn E).

R:SUC(MCA/BA

C:SIEZURE C

R:MGIC_DATA(create_con(MBA/BAT))


CRCX


R:MGIC_DATA(create_con_ack)

COMUE:transparent_data(MCA/BAT) CRCX_A

COMUE:create_con_ack

O:COT

O:ACO:ANSW

R:ACM

R:ANSWE

ISUP- TP TP CA/MC MG

O:IAM

R:APM(MCA/BA

PCUCC-

R:APMMCA/BAT

(connected)


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R:MGI_DATA(transp_data)

R:MGI_DATAtrans data

R:MGI_DATA(create_caon_ack)

Qu trnh bo hiu trong Softswitch (Bn E).

Bo hiu cuc gi PSTNtoPSTN c s dng giao thc BICC v SIP:Khi hai Media Gateway kt ni ti hai Softswitch khc nhau, qu trnh thit lp cuc

gi din ra phc tp hn. Hai Softswitch c th s dng giao thc BICC hoc giao thc SIP lin lc vi nhau.

Kt ni da trn giao thc BICC ISUP*:

Qu trnh thit lp cuc gi din ra cng tng t vi trng hp trn.Tn hiu iukhin cuc gi (BICC*) c s dng nhm truyn thng tin v kh nng ca knh truyngia hai MGC.

Create_con(transp_data:codec,rem_ip_trsp_addr,connected_fw) ADD _RQU (codec,

rem_ payl_trsp_addr)

ADD_CNF(ctxtID,

SIEZECOX

ADD_RQU(accessID,chanID,MG,

ctxtID,termID,put_throung_both_way)

ADD_RQU_MG(rem_payl_trsp_addr,codec,chanID_accessID,put_through_bothway,transp_

ID)

ACK

transp_data(loc_payl_trsp_addr,codec,connect_fw+notification)

ADD_CNF( termID,loc_payl_trsp_addr)

ADD_CNF_MG( termID, loc_payl_trsp_addr,transID, transID)

R:MGI_DATA(create_con)

Createconnection

Transp_dataconnected

create_con_ac

COX MGAP MGCPMCU


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BICC ISUP* : l giao thc dng lin lc gia hai MGC, nhm truyn d liu IPgia hai MG. N l tn hiu vn chuyn thng tin v kh nng ca knh truyn, da trnchun ITU-T Rec.Q.1901 CS2 v iu khin thit lp cuc gi trn trung k BICC o. Ncng c b sung thm chc nng chuyn i tn hiu truyn ti v c th c truyngia hai Softswitch nh l bn tin SS7 over IP (BICC* over IP).

Qu trnh thc hin cuc gi nh sau:

1. Tng i PSTN yu cu cp mt trung k ri khi to cuc gi bng cchtruyn thng tin v s trung k (CIC) ti hiQ 9200 thng qua tn hiu SS7 trong bntin IAM ca ISUP.

2. S trung k ny sau c MGC ca hiQ (O) chuyn t SS7 sang giao thcMGCP. Bn tin ny c truyn ti MG (I) thng qua mng IP.

3. Media Gateway hiG 1000/1200 truyn li i ch IP ca n cho SoftswitchhiQ 9200.

4. Bn tin c truyn t hiQ 9200 (O) bn gi ti hiQ 9200 (D) ca bn cgi thng qua giao thc BICC*.

5. Softswitch hiQ 9200 (D) cp mt trung k cho tng i PSTN gi n.

6. hiQ 9200 gi a ch IP ca Media Gateway hiG (I) ti hiG (E).

7. hiG (E) truyn li a ch IP ca n cho hiQ 9200 (D).

8. a ch IP ca hiG (E) c gi qua cho hiQ 9200 (O) bng BICC*.

9. hiQ 9200 (O) truyn a ch IP ca hiG c gi ti hiG ch gi.10. Khi vic chim dng trung k din ra thnh cng th tng i

PSTN/ISDN thng bo li bn tin SS7 ISUP Address Complete Message bobt u truyn tn hiu thoi.

11. Bn tin ny c truyn t hiQ 9200 (D) ti hiQ 9200 (O) thng quagiao thc BICC*.

12. Bn tin c truyn ti tng i PSTN/ISDN c gi t hiQ 9200(O).

13. Tng i PSTN/ISDN c gi gi li bn tin bo sn sng nhn cucgi.

14. hiQ 9200 (D) gi bn tin bo sn sng nhn cuc gi cho hiQ 9200(O).

15. hiQ 9200 (O) truyn bn tin sn sng nhn cuc gi cho tng i chgi.

16. Lu lng RTP truyn qua li gia hai Media Gateway truyn tnhiu thoi ca hai thu bao.


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Trnh t thit lp cuc gi.

Kt ni da trn giao thc SIP:

MGC c hai giao din SIP ni l SIP-NNI (dng cho cuc gi SIP) v SIP-T.

SIP NNI dng trong kt ni gia thu bao SIP v mng PSTN.

SIP T m nhim vic truyn ti IP ca ISUP gia hai MGC.Trong trng hp, vic truyn a cc bn tin gia ny gia MGC v tng i PSTN

vn ging nh cc kt ni trc. Tuy nhin c mt s khc bit l bn tin ACM ctruyn i cha cp tn hiu hi m chung cho bn gi.


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Qu trnh thc hin c din t nh hnh sau:

Dng giao thc SIP kt ni hai MGC.


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3.2 Thu bao PSTN n H.323 (RFS hay Pure)

Hot ng:

Hnh di y m t cuc gi Phone-to-H.323 (RFS)

Kch bn cuc gi Phone to H.323 (RFS/PURE)

Bn A: HiQ h tr CA pha A vi thng tin MG-TSAlias, thng tin ny gi d liu nMG. MG tr v CA a ch IP/RTP ca bn A. CA gi mt bn tin CREATECONNECTION ACK cng vi a ch IP/RTP tr li CC-LTG.

Bn B: Nhn c mt bn tin thit lp cuc gi SETUP cng vi a ch IP/RTP cabn A. Bn tin SETUP c gi tip n thu bao B. Khi thu bao B tr li cuc gi, ngi a ch IP/RTP ca mnh tr li pha A.

Bn A: khi nhn c bo co MGIC-DATA, a ch IP/RTP ca bn B mang theoc c vo MG hon thnh d liu kt ni.

Phn u tin ca vic thit lp kt ni bao gm vic ng k ca ngi dng H.323vo mng.


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Gatekeeper o ca u cui ngi dng H.323 c qun l trong H.323 Client vkhng s dng mt th tc tm kim H.323 no.

Th tc ng k bao gm cc bc:

Gi yu cu ng k t Client ti HiQ 20.

HiQ 20 truy vn v nhn p ng t my ch th mc HiQ 30.

Quyn hn ca ngi dng H.323 c gi trong b nh ca HiQ 20.

HiQ 20 gi xc nhn ng k tr li Client.

Di y l cc bc ca th tc thit lp cuc gi:

Thit lp cuc gi Phone to H.323

Bn tin IAM ca bo hiu s 7 c gi n HiQ 9200, yu cu mt HiG 1000.

HiQ 9200 gi bn tin to kt ni MGCP:CRCX n HiG, HiG chn mt ngtrung k v mt cng RTP/RTCP pha mng IP v gi a ch cng chn n HiQ 9200trong bn tin CRCX_ack.

HiQ 9200 gi yu cu nhn n HiQ 20 kim tra vic nhn v chuyn s E.164thnh a ch IP, v ch ra kiu cuc gi c nh tuyn. Thng tin ny c gi tr liHiQ 9200 trong bn tin xc nhn.

HiQ 9200 gi bn tin H.225 Setup n H.323 thng bo c cuc gi n v ach RTP/IP ca HiG pha A.


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H.323 khi u vng yu cu nhn v xc nhn nhn n HiQ 20 qua bn tinRAS:ARQ v HiQ 20 tr li bng bn tin RAS:ACF.

H.323 User gi bn tin cnh bo H.225 Alert v a ch ca n ti HiQ 9200.

HiQ 9200 gi bn tin SS7:ACM gi m bo ch cho thu bao ang gi.

H.323 user gi bn tin kt ni H.225 Connect ti HiQ 9200.

Lnh MDCX c gi t HiQ 9200 n HiG bao gm c a ch cng RTP/IP caH.323 user. HiG gi li bn tin bo nhn MDCX-ACK ti HiQ 9200.

HiQ 9200 gi bn tin tr li ANM n pha PSTN thng bo bt u cuc gi.

- Cuc gi c thc hin trn mt knh.

3.3 H323 (FSB hoc Pure) ti thu bao PSTN:


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Bn A: Mt bn tin SETUP nhn c t CA. CA s xc nh mi quan h gia CCLTG v loi H.323 da vo mt bn tin nghi vn CP. Bn tin SETUP s gi tip ti CCLTG cn nhn.

Bn B: Pha B nhn bn tin CREATE_CONNECTION cng vi a ch IP/RTP ca Av thng tin MG-TSAlias. Nhng d liu ny s c gi v MG. MG s phn hi a chIP/RTP ca chnh n ti CA, v gi tip ti A ging nh mt d liu trong sut.

Bn A: a ch IP/RTP ca B c gi tip ti u cui H.323 bng bn tinSETUP_RESPONSE.

Phn u tin ca qu trnh thit lp kt ni bao gm vic ng k ca ngi dngH.323 vo mng.

Gatekeeper o ca u cui ngi dng H.323 c qun l trong H.323 Client vkhng s dng mt th tc tm kim H.323 no.


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Bc Qu trnh thc hin

1 Yu cu ng k t client ti hiQ920

2 HiQ 20 truy vn v nhn p ng t my ch th mc HiQ 30

3Quyn hn ca ngi dng H.323 c gi trong b nh ca

HiQ 20.

4HiQ 20 gi xc nhn ng k tr li Client.

Th tc thit lp cuc gi:

Tc ng gatekeeper trong hiQ9200 b qun l bi H.323 client v khng c th tctm gatekeeper no c s dng.

Bc Qu trnh thc hin

1 Gi yu cu nhn v xc nhn nhn gia H.323 user v hiQ920 truy nhp vo hiQ9200 ca cuc gi t thu bao H.323

2 H.225 SETUP: Thng bo thit lp cuc gi c cha trong ach RTP/IP ca H.323 client

3 Gi yu cu nhn ti hiQ20 ti kim tra nhn ca hiQ9200

4 IAM ti PSTN

5 CRCX ti hiG cha a ch IP/RTP ca A (H.323 user) v CRCX-ACK cha a ch RTP/IP ca bn B(hiG)

6 ACM nhn t node PSTN

7 Gi bn tin cnh bo H.225 t hiQ9200 ti H.323 user cha ach RTP/IP ca B(hiG)


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8 ANM t hiQ ti node PSTN

9 Lnh MDCX c gi i t hiQ9200 ti hiG m kt ni

10 Bn tin kt ni H.225 t hiQ9200 ti H.323 user

11 Thc hin kt ni qua mt knh


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3.4 H.323 (RFS/PURE) n H.323 (FFS) phi hp vi vng lp ISUP.

Bn A (vi vng lp ISUP):bn A, tin trnh x l mt cuc gi c thc hinging vi tin trnh H.323 (RF/PURE) to Phone. im khc bit duy nht l trong vd ny, cuc gi t khi CA thay cho cuc gi H.323 RF/PURE v khi CA thaycho vng lp ISUP c t ti khi MGIC ti bn A. Chc chn rng trng hp 2cuc gi ny c th c t ti 2 khi MGIC khc nhau.

Bn B: nhn c bn tin SETUP cha thng tin v MG-TSAlias. Nhng dliu ny c ti v khi MG. Khi MG s tr a ch IP/RTP ca n ti khi CA.

Khi CA chuyn tip a ch IP/RTP thng qua bn tin SETUP ti thu bao B. Khithu bao B tr li cuc gi, khi CA s nhn c a ch IP/RTP ca thu bao B va ch IP/RTP c ti ti khi MG hon thnh kt ni d liu trong khiMG.


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3.5 H.323 (FFS) n H.323 (RFS/PURE) phi hp vi vng lp ISUP.

Bn A: nhn c bn tin SETUP vi a ch IP/RTP ca thu bao H.323. KhiCA quyt nh khi CC-LTG c lin quan thng qua s truy vn ca CP v chuyntip bn tin SETUP ti khi CC-LTG nhn. Khi CC-LTG tr v bn tin SETUP-ACK c cha thng tin v MG-TSAlias. Khi CA s ti d liu ca khi MG-TSAlias cng vi a ch IP/RTP ca thu bao ti khi MG. a ch IP/RTP ny lic chuyn tip ti thu bao H.323 vi bn tin SETUP-RESPONSE.

Bn B (vi vng lp ISUP): tin trnh x l cuc gi bn B c thc hinging vi tin trnh Phone to H.323 (RF/PURE). S khc bit duy nht l trong v dca chng ta cuc gi CA thay cho cuc gi H.323 RF/PURE v khi CA thay chovng lp ISUP c t ti khi MGIC bn A. Chc chn l trng hp 2 cuc giny c th c t ti 2 khi MGIC khc nhau.


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3.6 H.323 (FFS) n H.323 (FFS)

Bn A: Nhn c bn tin SETUP vi a ch IP/RTP ca thu bao H.323. KhiCA quyt nh khi CC-LTG c lin quan thng qua s truy vn ca CP v chuyntip bn tin SETUP ti khi CC-LTG nhn. Khi CC-LTG tr v bn tin SETUP-ACK c cha thng tin v MG-TSAlias. Khi CA s ti d liu ca khi MG-TSAlias cng vi a ch IP/RTP ca thu bao ti khi MG. a ch IP/RTP ny lic chuyn tip ti thu bao H.323 bn A vi bn tin SETUP-RESPONSE.

Bn B: Bn tin SETUP c cha thng tin v MG-TSAlias s c nhn t tngi EWSD. Nhng d liu ny s c ti n khi MG. Khi MG s tr a ch

IP/RTP ca n ti khi CA. Khi CA chuyn tip a ch IP/RTP qua bn tin SETUPti thu bao B. Khi thu bao B tr li cuc gi, khi CA s nhn c a chIP/RTP ca thu bao B v a ch c ti n khi MG hon thnh kt ni dliu trong khi MG.


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TI LIU THAM KHO

1. Nguyn Xun Khnh.Bi ging H Thng Chuyn Mch, Hc vinCng ngh Bu Chnh Vin Thng TPHCM, 2011.

2. L Quc Cng. Mng th h sau, Hc vin Cng ngh Bu Chnh

Vin Thng TPHCM, 2005.3. H Bo Quc. Bo co thc tp Tt nghip: Trin khai NGN ca

VNPT, D04VTA1, Hc vin Cng ngh Bu Chnh Vin ThngTPHCM, 2008.

4. Phan Thi Dng. Bo co Lun vn Tt nghip: Gii php Trungk o ca SIEMENS, D03VTA1, 2007.

5. SIEMENS,Hardware HiQ9200.6. SIEMENS, Call Flows HiQ9200.

hiq9200 giai phap trung ke ao ngn surpass cua siemens

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