Signaling Transport (SIGTRAN) protocol family

Transport of packet-based PSTN signaling over IP Networks.

For interworking with PSTN, IP networks will need to transport signaling such as Q.931 or SS7 ISUP messages between IP nodes such as a Signaling Gateway and Media Gateway Controller or Media Gateway.

See the IETF's working group sigtran-charter.


  • RUDP: Reliable UDP, the predecessor to SCTP. Only an (expired) Internet Draft, though a version of it is still used by Cisco.

  • SCTP: Stream Control Transmission Protocol, RFC2960

SCTP has PPID's (Payload Protocol IDentifiers, see IANA's list) for the following protocols:

  • M2UA: Signaling System 7 (SS7) Message Transfer Part (MTP)2 - User Adaptation Layer RFC3331

  • M2PA: Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) - User Peer-to-Peer Adaptation Layer (M2PA) RFC4165

  • M3UA: Signaling System 7 (SS7) Message Transfer Part (MTP)3 - User Adaptation Layer (M3UA) RFC4666

  • IUA: ISDN Q.921-User Adaptation Layer RFC4233

  • SUA: Signalling Connection Control Part User Adaptation Layer (SUA) RFC3868

  • V5UA: V5.2-User Adaption Layer (V5UA) RFC3807

  • H248: MEGACO

  • BICC: Bearer Independent Call Control

  • TALI:

  • DUA: Digital Private Network Signaling System (DPNSS)/Digital Access Signaling System 2 (DASS 2)

  • Extensions to the IUA Protocol RFC4129

  • ASAP:

  • ENRP:

  • H323:

  • M2TP:

Which in turn can carry:

  • ISDN: Integrated Services Digital Network

  • Q.921: ISDN Q.921-User Adaptation Layer RFC 3057

  • Q.931: ISDN user-network interface layer 3 specification for basic call control

  • ISUP: ISDN User Part

  • MTP3: Message Transfer Part Level 3

  • SCCP: Signalling Connection Control Part

Imported from on 2020-08-11 23:24:41 UTC