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Location + service URN (cont’d)
When the asserter is the UAC/Proxy, SIP message is INVITE, this is the current way
Pros:
Simple to use in many use cases
Requires no additional authentication infrastructure (beyond LoST)
Cons:
Fails when Asserter has no location
Fails if LoST information changes
Relies on trusted LoST infrastructure
Endpoint-centric definition of emergency call
PPT Version