SIGTRAN and SIP-T

 

The IETF's Signalling Transport working group has developed SIGTRAN to address the transport of packet-based PSTN signalling over IP Networks, taking into account functional and performance requirements of the PSTN signalling. For interworking with PSTN, IP networks will need to transport signalling such as Q.931 or SS7 ISUP messages between IP nodes such as a Signalling Gateway and Media Gateway Controller or Media Gateway.

Applications of SIGTRAN include Internet dial-up remote access and IP telephony interworking with PSTN.

See the IETF site