The draft draft-polk-sip-rph-in-responses-00 allows UAS(es) to
include resource priority headers in responses.
I'm trying to figure out exactly what these headers really mean in
responses.
RFC 4412 explains what the RPH is used for in requests:
1. The request can be given elevated priority for access to PSTN
gateway resources, such as trunk circuits.
2. The request can interrupt lower-priority requests at a user
terminal, such as an IP phone.
3. The request can carry information from one multi-level priority
domain in the telephone network (e.g., using the facilities of
Q.735.3 [Q.735.3]) to another, without the SIP proxies
themselves
inspecting or modifying the header field.
4. In SIP proxies and back-to-back user agents, requests of higher
priorities may displace existing signaling requests or bypass
PSTN gateway capacity limits in effect for lower priorities.
This all has to do with prioritizing the media channel that is being
established by the request in-question.
So what does it mean to have an RPH in a response? It doesn't seem
that we're using the response to affect the priority of the media
channel. Are we perhaps reporting the priority that was granted to
the media channel on the assumption that the priority granted might
differ from the priority requested?
--
Dean
_______________________________________________
Sip mailing list https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use [EMAIL PROTECTED] for questions on current sip
Use [EMAIL PROTECTED] for new developments on the application of sip
