[h323plus] Negotiate /Renegotiate video channel during call

Simon Horne s.horne at packetizer.com
Sat Nov 26 00:02:21 EST 2011



Here is some simple code to do what you want.

You will need to collect the H323ChannelNumber in the open session to know
which session to close.


PBoolean MyH323Connection::OpenMyVideoSession(H323ChannelNumber & num)


  PBoolean IsOpen = false;

  for (PINDEX i = 0; i < localCapabilities.GetSize(); i++) {

    H323Capability & localCapability = localCapabilities[i];

    if (localCapability.GetMainType() == H323Capability::e_Video) {

      H323Capability * remoteCapability =

      IsOpen = (remoteCapability && logicalChannels->Open(remoteCapability,
H323Capability::e_Video ,num));

        if (IsOpen) 




  return IsOpen; 



PBoolean MyH323Connection::CloseMyVideoSession(const H323ChannelNumber &



    return true;





From: h323plus-bounces at lists.packetizer.com
[mailto:h323plus-bounces at lists.packetizer.com] On Behalf Of J.C Mercier
Sent: 26 November 2011 03:11
To: h323plus at lists.packetizer.com
Subject: [h323plus] Negotiate /Renegotiate video channel during call


Hi all,

Does anyone know if it's possible in H323plus renegotiate for video channel
during a call?

For instance, let's say I started an audio only call and the remote party is
sending either audio only or both audio and video, is there a way for me
start sending my video as the call is already in progress?

And also, if i'm in a video call (sending my video) and i want to switch to
audio only by stopping video (my video transmission) while the call is in
progress, how would go about doing that?

If this is not supported, what approach is supported in H323plus?

Thanks in advance for your help.

Josh C.

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