On 8/11/14 12:33 AM, Arun Tagare wrote:
Hi Paul,
According to your response as below.
"It is also possible for Alice to use 3pcc O/A techniques to establish a
direct *media* path between Bob and Charlie, while Alice remains in the
signaling path between them"
While Alice remains in the signaling path means it is some thing like
"Conference Call you are talking about"
Correct me if i am wrong.
That depends on what you mean by "some thing like". :-)
You can think of it as a conference hosted by Alice, but where Alice is
muted. Because Alice is muted there is no need for "mixing" of the media
- it is sufficient to "switch" the media. So it is a lower cost operation.
Thanks,
Paul
Thank you,
With Regards
Arun A. Tagare
On Wed, Aug 6, 2014 at 12:30 AM, Sourav Dhar Chaudhuri
<sourav_mi...@yahoo.co.in <mailto:sourav_mi...@yahoo.co.in>> wrote:
Hi Paul,
Thanks a lot for your detailed response. You have answered all
my doubts.
I am really grateful for your email.
Thanks & Regards,
Sourav Dhar Chaudhuri
On Tuesday, 5 August 2014 8:11 PM, Paul Kyzivat
<pkyzi...@alum.mit.edu <mailto:pkyzi...@alum.mit.edu>> wrote:
On 8/4/14 10:12 AM, Sourav Dhar Chaudhuri wrote:
> Hi,
> Is there any way when a answered call [ 200OK is already
provided for initial INVITE and ACK also sent] can be transferred
without using REFER method?
>
> If it is possible without REFER then please let me know
required procedure.
More detail is needed to answer this.
Lets assume that Alice and Bob are in a call. You want a transfer, so
let's assume the transfer target is Charlie.
Further, assume it is Alice that wants to initiate the transfer,
resulting ultimately in Bob talking to Charlie.
A simple answer to your question is for Alice to initiate the call to
Charlie, and then bridge the media between Bob and Charlie. It is also
possible for Alice to use 3pcc O/A techniques to establish a direct
*media* path between Bob and Charlie, while Alice remains in the
signaling path between them.
The reason for REFER is to get Alice out of the signaling path. If there
is a middlebox in the signaling (e.g. a sip pbx or an SBC) then in
principle Alice can ask that middlebox to handle the transfer. But Alice
needs a way to convey the desire to do so. Often REFER is still used for
that, but is intercepted by middlebox, which then uses mechanisms such
as I described above. Some other mechanism, other than REFER, can be
used for that but it will be a proprietary solution.
Does that help?
Paul
_______________________________________________
Sip-implementors mailing list
Sip-implementors@lists.cs.columbia.edu
<mailto:Sip-implementors@lists.cs.columbia.edu>
https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
_______________________________________________
Sip-implementors mailing list
Sip-implementors@lists.cs.columbia.edu
<mailto:Sip-implementors@lists.cs.columbia.edu>
https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
--
With Regards
Arun A. Tagare
+91 9449 029729
_______________________________________________
Sip-implementors mailing list
Sip-implementors@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
