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SIP & SS7

SIP & SS7. James Rafferty, Cantata Technology. Agenda. Overview SS7 + SIP in the Converged Network SIP and SS7 Applicable Standards Use Cases Challenges What’s Ahead? Resources Summary. Overview. SIP (Session Initiation Protocol) has won the IP Standards Wars

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SIP & SS7

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  1. SIP & SS7 James Rafferty, Cantata Technology

  2. Agenda • Overview • SS7 + SIP in the Converged Network • SIP and SS7 • Applicable Standards • Use Cases • Challenges • What’s Ahead? • Resources • Summary

  3. Overview • SIP (Session Initiation Protocol) has won the IP Standards Wars • SIP is an important part of the current and emerging IP Networks • Most new deployments use SIP • SIP is the key protocol for the IP Multimedia Subsystem (IMS) • SS7 is the dominant signaling protocol used on Landline and Wireless networks • It has been particularly successful for 2nd generation wireless networks

  4. SS7 + SIP in Converged Network • SS7 will typically be found on the edge of the converged network • ISUP (ISDN User Part) used for Call Control • TCAP (Transaction Capabilities Application Part) used for various database lookups such as Local Number Portability (LNP) and Caller Name Lookup (CNAM) • SIP used for backhaul of signaling or in the core between gateways • SS7 can either be converted to SIP or transported via SIP-T

  5. SIP and SS7 - Applicable Standards • Key SS7 Standards are from ITU, ETSI and ANSI • Country specific variants are very common; usually based on ITU or ANSI • Latest SIP Standard is RFC 3261 • Many additional RFCs which document additional methods • Several standards for SIP – SS7 interworking • IETF RFC 3372 – SIP-T • Transfer ISUP elements via SIP with MIME body parts • IETF RFC 3398: SIP – SS7 Mapping • Map ISUP parameters to SIP headers (where available) • ITU-T Q.1912.5: More extensive SIP-SS7 Mapping with “SIP-I” • SIP-I extends beyond SIP-T ; includes more SS7 fields • 3GPP TS 29.163: Similar to Q.1912.5 • This is part of the IMS suite of standards

  6. Use Case: SS7 to SIP Conversion Signal Transfer Point SS7ISUP SS7ISUP PLMN SS7ISUP SIP IPNetwork SIP Cell Phone IPPhone

  7. Use Case: SS7 Bridging via SIP-T Signal Transfer Point Signal Transfer Point SS7ISUP SS7ISUP IPNetwork SIP - T SS7ISUP SS7ISUP PLMN/RAN PLMN/RAN RAN Protocols RAN Protocols Cell Phone Cell Phone

  8. Use Case: Privacy of Identity Enforce CLIP/CLIR setting on SIP Identity Headers CLIP/CLIR service on Privacy of Identity Signal Transfer Point SS7ISUP SS7ISUP PLMN SS7ISUP SIP IPNetwork SIP Cell Phone IPPhone

  9. Challenges • Tremendous amount of SS7 based infrastructure in place • Transition strategies for using SS7 and SIP together are critical to manage capital expenditures • SS7 variants require switches and gateways which support the variants • Non-standard uses of SIP are common and hard to eliminate once in the network • Interop between equipment from different vendors is a “way of life” for the converged network • Best of Breed Enabling Technology Components • Creates opportunities for System Integrators

  10. What’s Ahead? • Lots of momentum behind IMS, which uses both SIP and SS7 • More formal model for SIP use at core • SS7 used at the edges and converted to SIP or SIP-I IMS Architecture Example • Many operators not waiting for IMS • Wireline vendors making extensive use of SIP “as is” • SS7 network in place and working; easier to add SIP for backhaul or new services • SS7 is well entrenched for services and will remain in place for years to come

  11. IMS Architecture SS7 signaling converted at edge

  12. Resources • Internet Engineering Task Force: www.ietf.org • Provides RFCs for SIP, RTP and some aspects of SS7 / IP interworking • Hitchhiker’s Guide to SIP: • http://www.ietf.org/internet-drafts/draft-ietf-sip-hitchhikers-guide-03.txt • International Telecommunications Union: www.itu.int • Develops SS7 series of recommendations and NGN • Third Generation Partnership Program (3GPP): www.3GPP.org • Develops IP Multimedia Subsystem and related standards • Cablelabs: www.cablelabs.org • Develops standards for Cable use of IMS • Article: Integration of SIP and SS7 for Voice over IP • http://www.tmcnet.com/sip/0307/feature_articles_integration_of_sip_ss7_for_voip.htm

  13. Summary • SS7 remains the dominant signaling protocol in today’s network • SIP is the key next generation VoIP Protocol • Integration of SS7 and SIP critical to leverage existing operator investments • Several strategies possible for transition to more IP centric infrastructure • Many vendors using SIP to build new services on their existing SS7 network • IMS is coming, but not the only way forward for operators making IP investments

  14. Thank You!

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