>>That is not specified anywhere, and that is not general behavior. The registration interval offered by the UA may be something which has been provided by the operator/service >>provider/internet provider. And, the UA may not even know whether it is behind a NAT or not - at least not before it has sent some SIP request, after which it may check the Via etc. > >i have not followed, but isn't there a protocol called stun that an ua should use to figure out it is behind nat or not?
Sure, if the UA knows that the edge proxy supports STUN (I think we have also said that one should not send STUN requests to entities without knowing whether they support it or not), or the UA is aware of other STUN servers. Regards, Christer _______________________________________________ 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
