On Aug 19, 2008, at 7:58 AM, Bartłomiej Kołakowski wrote:
Yes, I have, namely the P-Access-Network-Info header. There are two problems with it: 1. I cannot included called (B) party cell-id in it.
How do you know the B-party's cell ID in advance of a response coming back from them? The usual way to do this in SIP is to have the B-party information in a message coming from the B-party terminal, because until the call resolves into a response (or a request coming from the B-party), one doesn't know which of potentially many B-party terminals might answer.
Of course, your proxy might be prescient, in which case I'd like to ask for its help in managing my stock portfolio . . .
2. RFC says that proxy cannot insert this header, however I guess 3GPP allows P-CSCF to do it. Anyway in my case it will be an IMS AS retrieving location, acting as a proxy.
Theoretically the mobile inserts it, but I'm not currently cognizant of any technical reason why a proxy (such as P-CSCF) couldn't do it.
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