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Peering & Routing Designs Using Session Controllers & Media Gateways

James Rafferty Voice Peering Forum March 8, 2007. Peering & Routing Designs Using Session Controllers & Media Gateways. Agenda. Cantata Overview Topic Overview Roles and Relationships TDM to IP network All IP networks Applications and Case Studies Summary.

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Peering & Routing Designs Using Session Controllers & Media Gateways

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  1. James Rafferty Voice Peering Forum March 8, 2007 Peering & Routing Designs Using Session Controllers & Media Gateways

  2. Agenda • Cantata Overview • Topic Overview • Roles and Relationships • TDM to IP network • All IP networks • Applications and Case Studies • Summary

  3. Leading provider of enabling technology for the enterprise and service provider markets. Formed by the combination of Excel Switching and Brooktrout Technology Founded in 1984 300+ employees worldwide Global company Headquarters in Needham, Massachusetts Principal offices in MA, NH, CA, Belgium, and Japan Distribution: Enterprise: distributor and reseller network, direct OEM Service Providers: regional distributors, direct OEM sales Unique partner philosophy About Cantata Technology

  4. Overview – Evolving Voice Network • Voice network evolution Trends • PSTN  Hybrid  IP • IP network islands  Federations of IP • Creates need to connect all of the various network possibilities • Traditional – connect via Tier 1 carrier • Peering Model – connect directly between co-located carriers

  5. Complicating Factors • Signaling • Multiple Signaling protocols • IP – SIP, H.323, H.248 • TDM – SS7 ISUP, ISDN PRI, CAS • Media • Various voice codecs • Need support for fax, data and tones • Business • Carriers need to agree to work together, then they can solve the technical matters

  6. Stepping Into the Breach • Solving the signaling problem • Integrated media / signaling gateways can interwork between the PSTN and IP networks • SBCs sometimes used for mediation of signaling between IP networks • Solving the media problem • Media gateways can transcode between different media formats (voice, fax, tones) • Solving the Routing problem • Calls can be routed either by SBC or MGW routing engine • May want to use ENUM for PSTN -> SIP address translation • Connecting the Islands • VoIP Carriers can connect either directly or via a peering fabric • Direct IP connection is possible, but SBCs typically patrol the borders

  7. Cantata’s Integrated Media Gateway IMG 1010 • Provides Essential Media Support • Broad range of VoIP/wireless codecs and T.38 IP fax • Any to Any signaling • SS7 ISUP, ISDN, CAS*, SIP and H.323 • Address Translation • Use ENUM for E.164 phone number -> SIP * • Available in both TDM-IP gateway and IP-IP models • Compact 1U footprint, scalable from 96 to 768 ports • DS3, T1 and E1 interfaces all available • Backed by a world class Cantata support team * Available Q1, 2007

  8. Making the Connection: TDM -> IP SIP / H . 323 SS 7 + TDM IP Carrier TDM Carrier ISDN / CAS IMG 1010 Media Gateway Call 1 – TDM - TDM Call 2 – TDM - IP Media Gateway Functions: PSTN-to-IP Connection >Media >Signaling >Routing

  9. Making the Connection: TDM/IP to IP Session Border Controller SIP / H.323 SIP SS 7 + TDM IP Carrier 1 TDM Carrier ISDN / CAS SIP / H.323 IMG 1010 Media Gateway Call 1 – TDM - TDM Call 2 – TDM – IP – Carrier 1 IP Carrier 2 Media Gateway Functions: PSTN-to-IP Connection >Media >Signaling >Routing SBC Functions: IP-to-IP connection >Firewall and NAT traversal >Policy enforcement >Security >Signaling Interwork (SIP, H.323) Call 3 – IP – IP – Carrier 1 -> 2

  10. TDM/IP to IP with Peering Call 1 – IP – IP (transcode iLBC -> G.729) Session Border Controller SIP SIP / H.323 SS 7 + TDM SIP IP Carrier 1 TDM Carrier SIP / H.323 ISDN / CAS RTP IMG 1010 Media Gateway Media Gateway Functions: PSTN-to-IP Connection >Media >Signaling >Routing IP to IP Connection >Transcoding > ENUM address translation SIP IP Carrier 2 SBC Functions: IP-to-IP connection >Firewall and NAT traversal >Policy enforcement >Security >Signaling Interwork (SIP, H.323) Peering Fabric offers simpler connections among carriers

  11. Summary • Transition from TDM to IP networks underway • Carriers need to connect between diverse networks • Cantata’s IMG 1010 provides TDM – IP signaling, address and media translation • Also transcoding for all-IP networks • Cantata partners with SBC vendors to meet overall carrier needs • IMG can be coupled with SBCs and Peering Fabrics to support a wide variety of connections and call flows

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