[OpenSIPS-Users] Transfer issue with Cisco unified call manager

[Sasmita Panda]

Hi ,

    I have encountered similar issue . B2BUA mode of opensips not able to
change the SDP . I have tried to do this with Opensips-1.11 . I think it
cant even change the SDP .

         As for my understanding , Opensips only work as a middle man
between two  User Agent . It only change the signaling part(like : Route ,
Via , From etc ) but not the SDP part .

     I think it cant be don't by this module automatically . If this is
possible to do then I will be helpful also .

*Thanks & Regards*
*Sasmita Panda*
*Network Testing and Software Engineer*
*3CLogic , ph:07827611765*

On Tue, May 17, 2016 at 2:40 PM, Chen-Che Huang <acmicrox at gmail.com> wrote:

> Dear all,
>
> For collaboration purpose and some reasons, we have set up a kind-of-weird
> architecture with Cisco unified call manager (abbreviated CUCM) as follows.
>
> client A
> client B <---->OpenSIPS SIP proxy<---->CUCM
> client C                   |
>                          RTP proxy
>
>
> The OpenSIPS SIP proxy here acts as clients to CUCM. For each client, the
> OpenSIPS SIP proxy creates a unique socket to CUCM. All the requests and
> responses between clients and CUCM pass through the OpenSIPS SIP proxy. All
> the RTP packets between clients are relayed by RTP proxy.
>
> Although this architecture is kind-of-weird, it works for client
> registration and call setup. However, in this architecture, we cannot
> support a particular call transfer case.
> Client A calls client B (OK)
> Client A transfers the call to client C (OK)
> Client A transfers the call to make client B talk to client C (Failed in
> terms of media relay).
>
> The SIP signalling flow is basically okay. The problem is that we cannot
> let
> client B and client C's RTP packets relayed by the RTP Proxy because the
> SIP
> messages in this case are two separate dialogs (the CUCM acts in B2BUA
> mode). I have do a preliminary study to address issue by using the B2BUA
> module of the OpenSIPS but the module seems not to have the ability to
> modify SDP.
>
> Has anyone encountered similar issues or had any suggestion on this issue?
> Many thanks for any comments.
>
> Yours sincerely,
> Chen-Che
>
>
>
>
>  where client A transfers the call to make client B and client C with each
> other. Because CUCM acts like in B2BUA mode,
>
>
>
> --
> View this message in context:
> http://opensips-open-sip-server.1449251.n2.nabble.com/Transfer-issue-with-Cisco-unified-call-manager-tp7602968.html
> Sent from the OpenSIPS - Users mailing list archive at Nabble.com.
>
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