1. PSAP Callback Identifier
PSAP Callback Identifier
IETF#84, Vancouver, Canada
Ericsson AB 2011

2. NUTSHELL Identifier, present in the INVITE request of a PSAP callback
NUTSHELL
Identifier, present in the INVITE request of a PSAP callback
Helps network entities to identify, and give special treatment to, PSAP callback calls.
PSAP does not instruct network how to treat PSAP callback call.
Helps the UA, that made the associated emergency call, to identify the PSAP callback call.
PSAP callback can traverse different entities/networks than the associated emergency call
Ericsson AB 2011

3. PROPOSAL SIP Priority header field to indicate emergency
Priority: emergency
Not PSAP callback call specific indicator
Simply indicates emergency
Network policies to determine whether call is a PSAP callback call.

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