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SIGTRAN - An Introduction

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Tareque Hossain
Tareque Hossain

A quick overview of SS7, SIGTRAN, comparison between SS7 and IP stack, where SIGTRAN fits and how everything works together.

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SIGTRAN - An Introduction Tareque Hossain
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
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
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
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
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
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?

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SIGTRAN - An Introduction

  • 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?