So far as I know, many SIP UAs are using P-Asserted-Identity to display the real user. Please have a look at RFC3325. If the B2BUA knows which callee answered the call, it can insert this header. Then the UA will display the calling and called party accordingly.
Jerry Yin Mitel Networks. > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Paul > Kyzivat > Sent: Thursday, May 24, 2007 9:40 AM > To: George AK > Cc: [email protected] > Subject: Re: [Sip-implementors] B2BUA - Contact header? > > > > > George AK wrote: > > Hi, > > > > When UserA send INVITE which goes thru a B2BUA to UserB, > should the B2BUA puts its address in the Contact header field? > > If it doesn't insert its own contact address then it is a proxy rather > than a B2BUA. > > > In that case, UserA will see only B2BUA's Contact address in > the 200 OK response. > > Yes, that is the point. > > > How will UserA know, who actually answered the call? > > What do you mean by "actually answered the call"? > > As far as SIP is concerned, it is the B2BUA that answered the call, > though it may be acting as a surrogate for something else. > > Its hard for User A to make an accurate determination of who it is > talking to in any case. There is some work on called party identity that > you can look into. (I forget the name of the draft right now.) > > Paul > > > thanks in advance. > > > > rgds, > > George > > > > > > --------------------------------- > > Looking for people who are YOUR TYPE? Find them here! > > _______________________________________________ > > Sip-implementors mailing list > > [email protected] > > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
