Hi Aymeric, An example of where 3pcc or B2BUA might be a better choice would be if some of the UAs invoved in a session to be transferred do not support the REFER method. Generally, the advantage of 3pcc or B2BUA is that they rely on SIP without requiring extensions or feature support.
Thanks, Alan Johnston WorldCom sip:[EMAIL PROTECTED] > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]] On Behalf Of > Aymeric MOIZARD > Sent: Monday, January 21, 2002 9:36 AM > Cc: [EMAIL PROTECTED] > Subject: [Sip-implementors] draft-ietf-sip-service-examples-03.txt > > > > Hi, > the draft "draft-ietf-sip-service-examples-03.txt" > states in the "1. Overview" section that: > > "...Also, these flows do not represent the only way to > implement these services - other approaches such as 3pcc > (Third Party Call Control) or Back-to-Back User Agents > (B2BUA) may be more appropriate in some circumstances." > > Does anybody can help and give some highlights about which > "circumstances" can lead to choosing another approach. > > Thanks > Aymeric > _______________________________________________ > Sip-implementors mailing list > [EMAIL PROTECTED] > http://lists.cs.columbia.edu/mailman/listinfo/> sip-implementors > _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
