On Sep 3, 2007, at 2:59 PM, Hannes Tschofenig wrote:
Hi Dean,
in ECRIT we assumed that the Request URI contains the service URN.
We put that stuff into the Phone BCP document (which unfortunately
still contains an error I just noticed).
That's what we told the 3GPP in the past as well. Hence, they wrote
it in their specs. See TS 24.229, Section 5.1.6.8.3, bullet (1).
Within the ECRIT group we weren't aware that this issue has not
been decided and hence we are a bit concerned about the recent
change given that other SDOs followed our suggestion already.
Do you have an idea what we should do now?
Tell them not to translate the emergency service URN into something
that doesn't preserve the requisite information?
In IMS that should be easy, even if the CSCF is translating into a
routable PSAP entry.
In the broader IETF case, I suspect it means "NEVER retarget a
request URI that contains a service URN unless you're the terminating
PSAP's proxy, and then do so very carefully."
--
Dean
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