[Ieprep] Comment for WG Last Call on draft-ietf-ieprep-sip-reqs-01.txt

Dear all,

in my draft (draft-otty-ieprep-pstn-features-00.txt), I outlined the emergency services implemented in PSTN. As the charter of this WG says, "...consider how it (the Internet) can best support emergency management...", we should have a look how these services can be modeled using SIP. And as the SIP requirements draft covers the requirements for just this modelling, I tried to match those services with SIP.

In short, those services which I called "user-dependent/authenticated emergency call service" and "origin-dependent emergency call service" are (I believe) covered by the SIP requirements document. In my opinion, in the Internet context these services fall together: as there is no "trust by wire model" in the Internet, the origin-dependent call has to be authenticated and authorized as well, to set the appropriate flag(s) according the "SIP priority scheme". 

However, the (basic) emergency call service (or 911 call) has additional requirements. This are:
- for this service, the SIP server needs be able to resolve the dialed URI (e.g. sip:ambulance@closest) to the address of the nearest Emergency Response Center. 
- it must be possible to place this call must from all SIP phones and the user does not need to be authenticated or even not registered.
- then, the call must be able to receive the same priority levels as the other emergency calls to ensure that the call is processed in the SIP proxies and servers when a "catastrophe level" is activated, i.e. the overall service has to be restricted.

I feel, that those requirements have to be reflected somehow in the document under last call.

best regards
-Jörg                                     
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