[SIPForum-discussion] Holding A call While It is an Audio/Video Call

[mehmet]

Hi   Mithilesh ,

Thanks for your reply.
I have checked the RFC but it mentions only hold/unhold the streams.
When we have only an audio call, and the received reinvite contains
inactive attribute for the audio, we put the call on hold and indicate
this on the User Interface side(we put the dialog hold beside the
audio stream).

But in my case let's assume we have an audio and video stream with
sendrecv with the remote party.Then after the reinvite with the new
negotiation :

A offers :

      v=0
      o=alice 2890844526 2890844526 IN IP4 host.atlanta.example.com
      s=
      c=IN IP4 host.atlanta.example.com
      t=0 0
      m=audio 49170 RTP/AVP 0 8 97
      a=rtpmap:0 PCMU/8000
      a=rtpmap:8 PCMA/8000
      a=rtpmap:97 iLBC/8000
      a=inactive
      m=video 51372 RTP/AVP 31 32
      a=rtpmap:31 H261/90000
      a=rtpmap:32 MPV/90000
      a=sendrecv

B Answers :

      v=0
      o=bob 2808844564 2808844564 IN IP4 host.biloxi.example.com
      s=
      c=IN IP4 host.biloxi.example.com
      t=0 0
      m=audio 49174 RTP/AVP 0
      a=rtpmap:0 PCMU/8000
      a=inactive
      m=video 49170 RTP/AVP 32
      a=rtpmap:32 MPV/90000
      b=sendrecv

As we see audio stream will be inactive but video stream will be
sendrecv.If we did not have any video stream, we would put the call on
hold and show it on User Interface (GUI) to indicate that the we are
on hold when we receive a=inactive.
But now audio is inactive but video is sendrecv.
what should I do in this case?

Regards
Mehmet

2012/3/29 Mithilesh kumar <kumar.mithilesh at gmail.com>
>
> Hi Mehmet,
>      There are couple of way to solve this scenario.
>       You will have different "a=sendonly" for audio and video in SDP that way you can hold audio and video separately.
>       There are many other ways and you may use
>
>       http://www.ietf.org/rfc/rfc4317.txt
>
>       --- Mithilesh Kumar
>
>
>
> On Wed, Mar 28, 2012 at 6:16 PM, mehmet <eng.mehmetozi at gmail.com> wrote:
>>
>> Hi All,
>>
>> In Sip for only audio call, we use m=audio attribute which is sendrecv, recvonly, sendonly, inactive values to put a call on hold with sending a Re-Invite.
>> This was quite easy but, what if we use the video at the same time?
>> How we will indicate the remote party?Beucase audio and video may not be inactive at the same time always.
>> for audio it is possible to send "inactive" while we send for video "sendrecv" at the same time. If we put the call on hold, we will lose the video but remote party only indicates that audio session will be stopped but video session will go on.
>>
>> Do you know any common discussions on internet on this issue or RFC documents regarding to this information?
>> Could you please inform me about this? Beside this I think that everybody is interested in this issue :)
>>
>> Regards
>> Mehmet
>>
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>
>
>
> --
> Thanks & Regards
>
> Mithilesh Kumar