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Agenda. Introduction to 3GPP Introduction to SIP IP Multimedia Subsystem Service Routing in IMS Implementation Conclusions. Service routing in 3GPP IP Multimedia Subsystem. Teemu Jalava Supervisor: Raimo Kantola Instructor: M.Sc. Markus Isomäki, Nokia Research Center.

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Presentation Transcript
agenda
Agenda
  • Introduction to 3GPP
  • Introduction to SIP
  • IP Multimedia Subsystem
  • Service Routing in IMS
  • Implementation
  • Conclusions
service routing in 3gpp ip multimedia subsystem
Service routing in 3GPP IP Multimedia Subsystem

Teemu Jalava

Supervisor: Raimo Kantola

Instructor: M.Sc. Markus Isomäki, Nokia Research Center

3 rd generation partnership project 3gpp
3rd Generation Partnership Project (3GPP)
  • The 3rd Generation Partnership Project (3GPP) is a collaboration agreement that brings together a number oftelecommunications standards bodies and telecommunications companies.
  • Release ’99 was renamed Release 3
  • Release 4 was out March 2001
    • - IP network
  • Release 5 should be ready in summer 2002
    • - IP multimedia
  • Release 6
    • - All IP network
session initiation protocol sip
Session Initiation Protocol (SIP)
  • Creation, modification and termination of multimedia sessions
  • RCF 2543 -> RCF 3261
  • Request - Reply based transactions
  • Easy to make new extensions
  • ASCII based, clear text, similar to HTTP
  • Uses UDP or TCP
  • URL addressing

Client 1

Proxy

Client 2

INVITE

INVITE

100 Trying

180 Ringing

180 Ringing

200 OK

200 OK

ACK

ACK

Media streams

BYE

BYE

200 OK

200 OK

s i p routing
SIP Routing
  • SIP proxy takes care of user location resolving
  • DNS Service Resource Records (SRV RR) can be used to locate a SIP proxy in an other domain
  • via header is needed to ensure packets route the same way back
  • record-route header is needed is sertain proxies need to be in the routing path
ip multimedia subsystem ims
IP Multimedia Subsystem (IMS)

Call State Control Function (CSCF)

Interrogating-CSCF

  • Accesspoint to domain
  • Hides topology and configuration

(User Agent)

Serving-CSCF

Proxy-CSCF

  • Session control services
  • Registration, AS usage, charging, etc
  • First contact point
  • Provides provicy control and QoS authorization
  • Local services, like emergency calls and local numbering
application servers
Application servers
  • Using:
    • Call Processing Lanquage (CPL)
    • SIP Common Gateway Interface (CGI)
    • SIP Servets
  • What:
    • Presence
    • Instant Messaging
    • Group services

Roles:

  • SIP proxy
  • redirect server
  • Back-to-back-user-agent (B2BUA)
  • User Agent

How:

  • Forking
  • SUBSCRIBE - NOTIFY
  • MESSAGE
  • Third party call control
applic a tion example presence
Application example: Presence
  • Presence enables user to express willingness and availability to communicate
  • Can be used with phonebook to make a "buddy list"
  • Presence updates with REGISTER method
  • Presence download with SUBSCRIBE - NOTIFY
example of service routing
Example of service routing

Example of service routing

s cscf routing decisions
S-CSCF routing decisions
  • Based of Filter Criteria downloaded from Home Subscriber Server (HSS) at user registration
    • User profile
  • Filter Criteria
    • Address of the Application Server to be contacted.
    • Priority
    • Trigger Points (method, presence or apsence of any header, header content, etc)
    • Default Handling
    • Optional Service Information
implementation
Implementation
  • Proof of concept work
  • S-CSCF from a SIP proxy
    • Adding filtering
    • Integrated user profile
    • Configuring user profile
  • Testing with network containing Presence AS, redirection AS and SIP-SMSGW
conclusions
Conclusions
  • SIP based services are easy to make and integrate to the IMS network
  • Configuration is easy
  • Scalable sollution, AS and S-CSCF duplication
  • Release 5 has been delayed from jan 2002 to june 2002, some features have been postponed to Release 6
  • Some pressure from 3GPP to IETF to finalize new SIP RFC and SIP compression
    • These might have some impact to service routing issues
slide16

Thank you!

  • Questions?
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