[SIP] 3PCC and REFER method
<Javier_Ferreiro_Garcia/UT03329/PLATAFORMAS_DE_SERVICIOS/TSM@tsm.es> Fri, 29 December 2000 13:40 UTC
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From: Javier_Ferreiro_Garcia/UT03329/PLATAFORMAS_DE_SERVICIOS/TSM@tsm.es
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Subject: [SIP] 3PCC and REFER method
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Date: Fri, 29 Dec 2000 11:59:43 +0100
Hi I would like to open again the issue discussed in http://lists.bell-labs.com/pipermail/sip/2000q4/004739.html >>What happens when there is not an active SIP (INVITE) session between the >>referer and referee ? Sending an INVITE in this case may have unwanted >>effects (like initiating a call). Are you proposing that either a) you would >>only send the INVITE/BYE if a corresponding SIP (INVITE) sessions exists or >>b) that REFERS are not allowed outside of a SIP session? > What does a REFER outside of a session mean? and apply this idea to the scenario proposed in draft-rosenberg-sip-3pcc-01.txt Figure 1 and specifically the example included for Click-to-dial application. In this alternative scenario for Click-to-dial, the controller, after receiving the request via HTTP, do not INVITE both A and B, but rather send a REFER to A, asking A to INVITE the CONTROLER ITSELF. When the controller receives the INVITE SDP A from A, checks in its internal database who is supposed to be contacted by A (in this case B) and sends INVITE SDP A to B. In this case I think the re-INVITE loop could be avoided by applying this scenario which is more similar to a normal INVITE between two parties. In this alternative scenario the referer (i.e. the controller) and the referee (i.e. the web-surfer) are OUTSIDE of a SIP session, but INSIDE an HTTP session. It could also be decided the referee to be the IP phone from the customer service representative, if the web-surfer IP phone either does not support REFER or is a PSTN endpoint. The reason to include as content of Refer-To header not B but the controller itself is to let the controller do its job in a more general way (i.e. imagine click-to-dial + mid-call-announcement) If the scenario is not the one described for Click-to-dial, but for Mid Call AnnouncementCapability, the controller does not either set up the call to A or send the REFER method to A, but rather receive the INVITE from A and act as a "termination and reinitiation point" for control purposes (i.e. disconnect and reconnect A to a media server under certain conditions) as defined in draft-rosenberg-sip-3pcc-01.txt Sorry if someone has already suggested this and I have missed it... Comments? -----------------------------< O >----------------------------------- Javier Ferreiro Garcia Consultant Telefonica Moviles Spain Dpto. de Plataformas de Servicios 3rd Generation Intelligent Network Platforms Telf.: +34 630 00 43 13 -----------------------------< O >----------------------------------- _______________________________________________ SIP mailing list SIP@lists.bell-labs.com http://lists.bell-labs.com/mailman/listinfo/sip
- RE: [SIP] 3PCC and REFER method ferreiro_j
- [SIP] 3PCC and REFER method Javier_Ferreiro_Garcia/UT03329/PLATAFORMAS_DE_SERVICIOS/TSM
- RE: [SIP] 3PCC and REFER method Eric Burger