Quoting Alan Johnston <[EMAIL PROTECTED]>:
> Patrick,
>
> Thanks for your questions on the draft. The flow could be done either
> way, with
> B sending the REFER to either C or A.
>
> There are two objectives in this flow - that after the REFER is sent,
> neither A
> or C's phone should ring for the resulting INVITE, and that the
> recipient of the
> INVITE can determine that the resulting session between A and C should
> replace
> the existing session between A and B. I thought that sending the REFER
> to C and
> possibly including a Replaces header in the resulting INVITE from C to A
> does
> this rather cleanly.
See remarks below
>
> As for billing issues, I think this flow matches the existing PSTN if
> the
> transfer occurs behind a PBX. For example, if A calls B, then B signals
> the PBX
> to transfer A to C, the call would be hairpined at the PBX, and the B to
> C leg
> would be billed to B.
I am not sure that a PBX works like that.
>
> However, this flow could work either way.
>
> As for the RTP flow between B and C, it is initially set up so that B
> can tell C
> "I'm going to transfer A to you - hold on." Since this is an attend
> transfer
> flow, B should maintain sessions with both A and C in the event of a
> failure.
Yes but why say "hold-on" to C and then ask C to call A . B could ask A to call
C.
> Once B is notified that the transfer has succeeded, a BYE is sent
> tearing down
> this session. Note that B could put C on hold before sending the REFER.
>
> If you have an alternative flow for this example, lets discuss.
>
> Thanks,
> Alan Johnston
> WorldCom
> sip:[EMAIL PROTECTED]
>
> [EMAIL PROTECTED] wrote:
>
> > Sirs,
> >
> > I have questions regarding I-D draft-ietf-sip-service-examples-01.txt.
> > In the the "attended transfer" why B asks C to call A whereas A has
> called B.
> > Could i imagine that after B having in communication with C, B puts C
> on
> > hold and asks A to call C?
> > It could solve some Billing Pbs. A would stay the originator of the
> call and
> > could be charged .
> >
> > In the same examples: What is the RTP flow kept between B and C for ?
> >
> > Thank you for your answers,
> >
> > pm
> > _______________________________________________
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> > [EMAIL PROTECTED]
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>
>
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