Service URN (Uniform Resource Name)

Service URN (Uniform Resource Name) is a URN with “service” as the first component supplied as an input in a LoST request to an ECRF to indicate which service boundaries to consider when determining a response. A Request URI with the service URN of “urn:service:sos” is used to mark a call as an emergency call. See RequestURI in SIP (Session Initiation Protocol).

NENA-STA-010, NENA i3 Standard for Next Generation 9-1-1