02. ngn protocol overview.pdf

8/10/2019 02. NGN Protocol Overview.pdf

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ISSUEISSUE

Fixed Network Curriculum

Development Section

Fixed Network Curriculum

Development Section

OAA000003 NGN ProtocolOverview

OAA000003 NGN ProtocolOverview

2.02.0



Security Level: Internal

2

ObjectiveObjective

Concepts of SoftSwitch interfaces

and protocols

Classification of SoftSwitch protocols

Roles of SoftSwitch protocols and

signaling

After this session, you will learn:




3

About this SessionAbout this Session

Interfaces and Protocols

SoftSwitch Signaling System

SoftSwitch Signaling Classification

SoftSwitch Signaling Bearing




4

Interface and ProtocolInterface and Protocol

An interface is the connection point

between two adjacent network entities,

and a protocol specifies the principles

to be followed for information

interchanging over such connection

points (interfaces) Different protocols

are usually used on different interfaces

and maybe on the same interface aswell.




5

SoftSwitch Interfaces and ProtocolsSoftSwitch Interfaces and Protocols

MRS

IADAMG

TMG

SG

SIP

SIGTRAN

H.248

MGCP

MGCP/SIP/H.323

M G C P /

H . 2 4 8

EPhone

SIP域域域域

SIP

H.323

MML/SNMP

NMS

FTP/FTAM

BC 业务层业务层业务层业务层

控制层控制层控制层控制层

接入层接入层接入层接入层其它网络其它网络其它网络其它网络

SoftSwitch SoftSwitch

SS7

H.323域域域域

PSTN

SCP

I N A P

P A R L A Y

APP Server

S I P / I N A P

M G C P / H . 2 4 8




6

Corresponding Relations between SoftSwitch


Corresponding Relations between SoftSwitch


TCP/IPFTP or FTAMSoftSwitch-BC (Billing Center)

-MML or SNMPSoftSwitch-NMS (Network Management Syst)

UDP/IP、、、、TCP/IPH.323SoftSwitch-H.323

UDP/IPSIPSoftSwitch-SIP (Sesion Initiation Protocol)

MTPSS7SoftSwitch-PSTN/ISDN (Public OldTelephone Network) Integated services data

network)

UDP/IPSIPSoftSwitch-SoftSwitch

UDP/IP、、、、TCP/IPH.323UDP/IPSIP

UDP/IPMGCP

SoftSwitch-Terminal

UDP/IPMGCPSoftSwitch-MRS (Media Resource Server)

UDP/IPMGCP、、、、H.248SoftSwitch-IAD (Integrated access device)

UDP/IPMGCP、、、、H.248SoftSwitch-AMG (Access Media Gateway)

UDP/IP、、、、SCTP/IP、、、、TCP/IPH.248SoftSwitch-TMG (Trunk media Gateway)

M3UA/M2UA/SCTP/IPSIGTRANSoftSwitch-SG (Signalling Gateway)

Signaling Transmission ProtocolsApplication

Protocols

Interface




7

SoftSwitch Protocol SystemSoftSwitch Protocol System

MTP1

IP

TCP

H.248 MGCP SIP

MAC

SS7 H.248 MGCP SIP

MTP3

MTP2

I

SUP

SCTP

IP

MAC

SCTPUDP

IP

MAC

UDP

IP

MAC

UDP

1

2

3

4

5

6

7

OSI

layerlayerlayerlayer

IP

H.323

MAC

H.323

TCPUDPM2UA

M3UA

SCCP

TCAP

INAP




8









9

SS7 SignalingSS7 Signaling

MACMTP1

MTP2

MTP3

SCCP

TCAP

TUP

ISUP

M3UA

IP

INAP

User part

MTP

M2UA

SCTP




10

SIP ProtocolSIP Protocol

Session Initiation Protocol (SIP) is an

application-layer control protocol that

can establish, modify and terminate

multimedia sessions or calls. It is the

core protocol of IETF multimedia data

and control architecture. It can be easily

expanded, conveniently achieved, and

suitable to implement Internet-based

multimedia conference systems.

The NGN Soft-Switch system

interconnects with other Soft-Switch

systems and SIP domain devices via SIP

signaling, achieving the call control

functions between them.

MAC

IP

UDP

SIP

User Part

MTP




11

H.323 ProtocolH.323 Protocol

MAC

IP

H.323

UP

MTP

TCPUDP

Q.931 RAS/H.245

H.323 is a communication control protocol put

forward by ITU. It provides multimedia

communications services over Packet Based

Networks (PBNs). Call control is one of the

major parts of H.323 and can be used to

establish point-to-point media conference andmultipoint media conference.

H.323 defines entities such as H.323 Gateways,

Gatekeepers, Multipoint Controllers, Multipoint

Processors and Multipoint Control Units. H.323

Gateways are between Switched Circuit

Network (SCN) and packet switched network.Gatekeepers provide access control and

address translation services. Multipoint

Controllers (MCs) provide the multipoint control

function for the multiparty conference.

Multipoint Processors (MPs) enables mixing of

multipoint media streams.

H.323 itself is a protocol set, including such

protocols as RAS, Q.931 and H.245. RAS is

transmitted on UDP, Q.931 is transmitted on

TCP and H.245 is transmitted on UDP.




12

MGCP and H.248MGCP and H.248

Media Gateway Control Protocol is a master/slave equipment control

protocol that provides signaling and call control for Media Gateways and

Voice over IP (VoIP) terminal devices (the Media Gateway Controller

controlling the Media Gateway). The protocol is a combination of simplegateway control protocols and IP equipment control specifications.

H.248/Megaco is a successor to MGCP and will finally replace it, while

their protocol concepts are thoroughly different. With the development of

NGN, the media control protocols between the MGC and the MG will beunified to H.248 gradually.

SoftSwitch Soft-Switch System acts as a MGC in the distributed gateway

model and controls various Media Gateways (such as Access Gateways,

Trunking Gateways, Residential Gateways, Media Resource Servers, etc.)via MGCP/H.248.




13

MGCP and H.248MGCP and H.248

MAC

IP

UDP

MGCP

UP

MTP

SCTP/TCP

H.248




14









15

SoftSwitch Signaling ClassificationSoftSwitch Signaling Classification

Signaling transport protocol – Signaling transport layer protocol

provides SoftSwitch with signaling transport services. One

application protocol of SoftSwitch can usually use multiple transport

protocols. For example, H.248 can use SCTP/TCP/UDP.

Bearer control protocol is a kind of master/slave protocol used for

Media Gateway Controller (MGC) to control Media Gateways (MGs),

such as Access Gateways, Trunk Gateways and Residential Gateways

from external call elements like a Call Agent (SoftSwitch).

Call control protocol – A protocol used to control call setup,

connection and termination. The call control protocols used in

SoftSwitch are ISUP of SS7, SIP and H.323. In a VoIP domain, SIP and

H.323 serve for call control in multimedia conference. ISUP is the call

control protocol used for the switched circuit network. 。。。。




16

Signaling Transmission ProtocolsSignaling Transmission Protocols

IP, TCP, UDP.

SCTP: Stream control transport protocol

M2UA - - User adaptation layer protocol of SS7 MTP2.

M3UA - - User adaptation layer protocol of SS7 MTP3.

MTP (Message Transport Protocol) - - SS7 network

protocol of TDM.

SCCP - -Providing INAP with signaling transmission

service




17

Bearer Control ProtocolsBearer Control Protocols

Bearer control protocol is used to control media

gateways.

MGCP and H.248 protocols




18

Call Control ProtocolsCall Control Protocols

ISUP and INAP -- Switched circuit network control

protocols.

H.323 and SIP - -Call control protocols in packet

switched network




19

AttentionAttention

Bearer control protocols are non-peer-to-peer protocols,

used between MGC and MG only, while call control

protocols are peer-to-peer protocols, used betweenMGC and MGC, that is, namely, inter-office signaling.

MGCP and H.248 protocols accomplish the bearer

control functions in the communication between TMG

and MGC, and the call control protocol above them is

ISUP. In communication between AG and MGC, ISUP

has the call control functions (for example, identification

of hanging on, hanging off, etc.) in addition to the bearer

control functions.




20








Security Level: Internal21

Question/issueQuestion/issue

What protocols does SoftSwitch adopt?

In what occasions are these protocols

used?




AnswerAnswer

-FTP or FTAMSoftSwitch-BC

-MML or SNMPSoftSwitch-NMS

UDP/IPSIPSoftSwitch-SIP entity

MTPSS7SoftSwitch-PSTN/ISDN

UDP/IPSIPSoftSwitch-SoftSwitch

UDP/IPSIPUDP/IPMGCPSoftSwitch-Ephone

UDP/IPMGCPSoftSwitch-MRS

UDP/IPMGCP、H.248SoftSwitch-IAD

UDP/IPMGCP、H.248SoftSwitch-AMG

UDP/IP、SCTP/IP、TCP/IPH.248SoftSwitch-TMG

M2UA/SCTP/IPSIGTRANSoftSwitch-SG

Signaling TransportProtocols

Application ProtocolsInterface




SummarySummary

SoftSwitch uses the following protocols: SIGTRAN,

MGCP, H.248, H.323, SIP and ISUP.

SIGTRAN protocol group is used when SoftSwitch is

interconnected with PSTN, over which the ISUP protocol

is borne. MGCP and H.248 protocols are used for

interconnection with various MGs. H.323 and SIPprotocols are used for interconnection among

SoftSwitch devices, and meanwhile, H.323 can also be

used for interworking with H.323 media terminal, while

SIP can be used for interworking with SIP terminal.

02. ngn protocol overview.pdf

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