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‘sos’ URL Similar in spirit to RFC 2142 (“postmaster”) related to RFC 3087 (“Control of Service Context using SIP Request-URI”) Any proxy receiving a SIP request checks whether “To” URL has format sip:sos@(anything) or sips:sos@(anything) If so, handle as emergency call e.g., if URI is sip:sos@(anything), invoke mapping protocol to get PSAP URI If all else fails, home proxy will recognize it ? testable, incrementally deployable can also create special service domains just for emergency services: sip:sos@sos-service-provider.com |