Gao, AFAIK, providing aspecific service, P/S-CSCF and AS are defined as B2BUA. >Yes. I agree with you. > >But I tried to give you one example(P-CSCF). > >The order of signals in P-CSCF's view can be different with UAC's view. > >For example, UPDATE and 200OK before 4xx. Then P-CSCF can have different session state. > > > >> Christer, >> >> >Hi, >> > >> >There are also "B2BUAs acting as proxies", that do not terminate the >> >dialogs. >> >> "B2BUAs acting as proxies" is a terrible entities ! >> It should behave as B2BUA. >> >> Regards, >> >> Shinji _______________________________________________ Sipping mailing list https://www.ietf.org/mailman/listinfo/sipping This list is for NEW development of the application of SIP Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip Use sip@xxxxxxxx for new developments of core SIP
