SIPT Status Update Jon Peterson Level3 Communications 49
- Slides: 8
SIP-T Status Update Jon Peterson Level(3) Communications 49 th IETF
What is SIP-T? • SIP for Telephones • Not an extension to SIP – a set of practices for interfacing SIP to the PSTN – Encapsulation of ISUP in SIP – Translation of ISUP parameters to SIP headers • Implemented at PSTN gateways, and carried endto-end • Makes as few assumptions as possible about the SIP networks it traverses
SIP-T in a Network (1) INVITE (IAM) GW Proxy Server GW IAM PSTN
SIP-T in a Network (2) INVITE (IAM) GW Proxy Server INVITE (IAM) GW IAM PSTN Reuse of ISUP at terminating gateway
SIP-T in a Network (3) INVITE (IAM) GW Proxy Server GW IAM PSTN Non-gateway ignores ISUP
SIP-T Context and Architectures • Describes a context for the use of SIP-T – As seen in the preceding slides – Defines the problem space of SIP-T • Addition of SIP content negotiation • Encryption or omission of ISUP when the signaling passes to an untrusted source • To become the new umbrella doc?
ISUP MIME draft • Defines a MIME type so ISUP can be carried in SIP • WG Last Call has passed • Several amendations since last IETF – IANA language for variants • Registered strings vs. ‘X-’ strings – Content-Disposition header • ‘signal’ v. ‘session’
Work related to SIP-T • LNP and Freephone indicators in tel URL – draft-yu-tel-url-01 • SIP-ISUP Mapping draft – draft-camarillo-sip-isup-00
