andmeside irt 0030 loeng 1116. nov. 2005 avo ots telekommunikatsiooni õppetool raadio- ja...
TRANSCRIPT
AndmesideIRT 0030
loeng 11 16. nov. 2005
Avo Ots
telekommunikatsiooni õppetoolraadio- ja sidetehnika instituut
Kokkuühendamine
ATM Networks
IWF
PSTN/ISDN Rec. Q.2931, PNNI
Frame Relay
Networks
IP-based Networks
Rec. Y.1310
IETF RFCs
IWF
IWF
Rec. I.555Rec. I.580
Rec. Q.931
ATM OSF & NM, M series Rec.
SNMP based
FR OSF & NM
PSTN/ISDN
IWF
SS7 Network
Rec. I.580Rec. Q.700 series
Wireless access
IWF
Võrkude ühiskasutus
Ethernet
AdhocNetwork
AdhocNetwork
cdma2000 1xoperator 1
cdma2000 1xoperator 2
GPRS
Edge
WLAN
WebServer
IPNetwork
IPNetwork
Võrguliikluse jaotus
Time slots
Arr
ival
rat
e
tts
T
C
Temporarilybuffered
What is SIP?
• Session Initiation Protocol protocol that establishes, manages (multimedia) sessions– also used for IM, presence & event
notification– uses SDP to describe multimedia sessions
• Standardized by IETF, 3GPP (for 3G wireless), PacketCable
Building Applications On Sip
• Applications for example instant messaging can be built on SIP. Such applications are quick to write with any SIP toolkit and are easily extensible.
Useragent
Proxyserver
Proxyserver
User agentACK
OK
invite invite
OK
ACK
invite
OK
ACK
LDAPserver
LDAP server
[email protected]> 138.47.19.103
Session mobility• Walk into office, switch
from cell phone to desk phone– call transfer problem SIP
REFER• related problem: split
session across end devices– e.g., wall display + desk
phone + PC for collaborative application
– assume devices (or stand-ins) are SIP-enabled
– third-party call control
Why Phone NUMBERS?• Users should not be burdened with device addresses,
when it’s people they really care about• Addresses should be mnemonic and empower
enterprises to manage the identities of their userssip:[email protected]
• It’s time to put E.164 phonenumbers behind us!
• A.G. Bell did not say:
“+1-617-252-1232, come here. I need you!”
SIPProxy
DNSSIP-PBXGateway
PBX
INVITE (sip:[email protected])
INVITE(sip:[email protected])
DNS SRV query sip.udp.bigu.edu
telephoneNumberwhere mail=”bob”
PRI / CASbigu.edu
CampusDirectory
SIP User Agent
Bob's Phone
SIP.edu Architecture (Phase 1)
DNS
INVITE (sip:[email protected])DNS SRV query
sip.udp.bigu.edu
bigu.edu
SIP User Agent
SIP.edu Architecture (Phase 2)
locationDB
If Bob has registered, ring his SIP phone; Else, call his extension through the PBX.
REGISTER(Contact: 207.75.164.131)
INVITE (sip:[email protected])
SIPProxy
SIPRegistrar
Bob's SIP Phone
PBX PSTN
SIP/PRIGateway
SIP.edu Configuration
SIP Server
Campus Network
Internet
DNS Server
LDAP Server
PBX PSTN
SIP/PRIGateway
DNS SRV Lookup
SIP Server
Internet
DNS Server
DNS SRV
LDAP Server
Campus Network
PBX PSTN
SIP/PRIGateway
SIP INVITE
SIP Server
Internet
DNS Server
SIP
LDAP Server
Campus Network
PBX PSTN
SIP/PRIGateway
LDAP Lookup
SIP Server
Internet
DNS Server
LDAP
LDAP Server
Campus Network
PBX PSTN
SIP/PRIGateway
Call Sent to PBX Gateway
SIP Server
Internet
DNS Server
SIP
LDAP Server
Campus Network
PBX PSTN
SIP/PRIGateway
Media Stream via Gateway to PBX
SIP Server
Internet
DNS Server
RTP
LDAP Server
Campus Network
PBX PSTN
SIP/PRIGateway
SIP.edu Configuration
SIP Server
Internet
DNS Server
LDAP Server
Campus Network
PBX PSTN
SIP/PRIGateway
SIP to PBX and PSTN Calling
SIP Server
Internet
DNS Server
LDAP Server
Campus Network
PBX PSTN
SIP/PRIGateway
PBX and PSTN to SIP Calling
SIP Server
Internet
DNS Server
LDAP Server
Campus Network