SIGTRAN - An Introduction
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The document introduces Sigtran, a protocol suite that provides reliable signaling transport for telephony systems, specifically for SS7 protocols over IP networks. It contrasts the SS7 signaling system with the Sigtran protocol stack, highlighting the benefits of the Stream Control Transmission Protocol (SCTP) in terms of flexibility and redundancy. As traffic demands increase, Sigtran offers a solution to alleviate capacity issues in PSTN networks by transitioning to IP infrastructure.
SIGTRAN - An Introduction
- 1. SIGTRAN - An Introduction Tareque Hossain
- 2. SS7 & SIGTRAN ! SS7 ! Stands for Signaling System No. 7 ! A set of telephony signaling protocols which are used to set up public switched telephone network calls throughout the world ! SIGTRAN ! Stands for Signaling Transport ! An IETF task force that defined the specifications for a protocol family to provide reliable datagram service and user layer adaptation (UA) for Signaling System 7 (SS7) & ISDN protocols over IP
- 3. Comparison of SS7 & IP Stack INAP HTTP TCAP TCP SCCP IP MTP3 DLL MTP2 Ethernet MTP1 MTP: Message Transfer Part SCCP: Signalling Connection Control Part TCAP: Transaction Capabilities Application Part INAP: Intelligent Network Application Part
- 4. SIGTRAN Protocol Stack TCAP SCCP MTP3 ISDN M3UA M2UA M2PA SUA IUA SCTP IP M3UA: MTP3 User Adaptation Layer M2PA: MTP2 User Peer-to-Peer Adaptation Layer SUA: SCCP User Adaptation Layer IUA: ISDN User Adaptation Layer SCTP: Stream Control Transmission Protocol
- 5. SCTP ! A new transport protocol with time sensitive signaling in mind ! Flexible enough for general use ! SCTP can use multi-homed endpoints for redundancy as opposed to TCP strictly connecting 2 endpoints ! TCP is byte streamed, application is responsible for structuring data. SCTP is message oriented, defining structured frames of data at transport layer ! Provides multi-streaming capability: data is split into multiple streams, each independently sequenced
- 6. SS7/ SIGTRAN Network Architecture PSTN Phone MGC MGC SSP IP Network STP STP SG SG IP Phone SCP SSP MG MG SoftSwitch PSTN Phone SG: Signaling Gateway MGC: Media Gateway Controller STP: Service Transfer Point MG: Media Gateway SCP: Service Control Point SSP: Service Switching Point
- 7. Future of SIGTRAN ! Traffic increased by Local Number Portability & SMS has pushed SS7 networks beyond capacity ! SIGTRAN allows PSTN network to offload traffic to IP networks ! PSTN infrastructure is many times larger and far reaching than IP networks ! SIGTRAN will last as long as PSTN networks last ! Questions? Comments?