> > For 10, I believe that it would work if an upstream evil B2BUA does > > topology hiding since the proxy uses the Via in the Request and not > > the Path in the response. > [JRE] What I meant was, if a proxy receives a REGISTER > request with only a single element in the Via header field, > how does it know whether the request came from a UA or from a > topology-hiding B2BUA? This is probably an unlikely situation > for a REGISTER request (UA -> B2BUA -> proxy), but can we rule it out?
Ah, "upstream" vis-a-vis the UAC, as opposed to "upstream" vis-a-vis the outbound proxy. Of course a B2BUA can screw things up. If one decides to have a B2BUA between the Outbound proxy and the UAC (which seems to be a weird place for putting it), then obviously the B2BUA would have to comply to outbound for outbound to work. I would think that normally, the B2BUA would be on the other side or the outbound proxy, or even co-located with it. There are plenty of opportunities for a B2BUA to mess things up. I don't believe it would make sense to say anything about it. _______________________________________________ Sip mailing list https://www.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
