April 20, 2023 53rd IETF - SIPPING 1
sos
Henning SchulzrinneColumbia University
April 20, 2023 53rd IETF - SIPPING 2
Summary
Address convention:– sip:sos@local-domain if known– sip:sos@aor-domain if not known– also: sos.service (e.g., sos.police, sos.fire,
sos.rescue) for specific services
Should UA translate 911 and 112 to sos?
First proxy that recognizes sos routes to appropriate emergency call center– maybe just use sos@aor-domain always
April 20, 2023 53rd IETF - SIPPING 3
Summary of discussion Out of scope: service behavior
– no caller-initiated disconnect even PSTN can’t do this
– call back Out of scope: finding appropriate
emergency call center– likely to be country-specific– currently, proprietary protocols (e.g., Intrado)
but use of universal identifier simplifies UA design:– accidental disconnect prevention– inclusion of location information
April 20, 2023 53rd IETF - SIPPING 4
Going forward
Status: WG item? I? BCP? PS? Unlike service URIs, agreement very
helpful– prevent accidental assignment to non-
emergency use (e.g., ad-hoc conference)– UA behavior
Informal coordination with NENA transition WG
Consider it ready for WGLC (except for IANA consideration section)