SIP <-> SS7 Gateways

SS7 (or C7) is the main signalling for PSTN interconnections. How do we interface between a SS7 network and a SIP network?

• Cosmos SS7-SIP Gateway Turn-key, high performance SS7/C7 solution from Cosmact. Scales from 1E1 to 64E1 per chassis. Supports single point code across multiple chassis. Flexible built in routing/digit manipulation rules for SS7/SIP conversion.
• Verisign offers a SIP to SS7 interconnection service.
• SS7/SIGTRAN SIP access service available at: The Voice Peering Fabric.
• Cantata Technology has an integrated media and signalling VoIP gateway that supports SS7, PRI and CAS for PSTN with SIP and H.323 for IP. IMG1010.
• Squire Technologies' SS7 and VoIP media gateway provides full call control routing and supports SIP, H.323, MGCP, H.248 and SS7, PRI ISDN, CAS, R2 SVI_MG SS7 Media Gateway
• Sangoma SMG: Asterisk SS7 Gateway Integrated Asterisk + SS7 Gateway Solution. Scalable and Expandable Asterisk architecture. Capacity for 16E1+. Telco certified around the world.

Resources

• RFC 3372 - Best current practise: Session Initiation Protocol for Telephones (SIP-T): Context and Architectures (About SIP - PSTN gateways)
• Master Thesis by Gonzalo Camarillo, published 1998 http://standards.ericsson.net/gonzalo/papers/report.pdf
• "Integration of SIP & SS7 for VoIP: Opportunities and Challenges" by James Rafferty at Cantata Technology. SIP Magazine March 2007

Products

• see SS7 Protocol Converters and Gateways

See Also

• SS7
• PSTN
• SIP