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.

Protocols

• 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