[Freeswitch-dev] Software/Hardware interoperability

Mario Gasparoni Jr mariogasparoni at gmail.com
Mon Nov 3 20:59:32 MSK 2014

Hello guys,

I am trying to use FreeSWITCH as a conference server for group calls. I'm
using mod_conference, and I know it works fine with multiple SIP clients
(for testing purposes I use Ekiga and Jitsi on both Windows and Linux).
Audio is mixed individually for each user, and video is switched based on
the active talker, and the same video is sent to all clients.

The problem shows up when I join the group call using a Polycom hardware.
If I configure FreeSWITCH to support H.263 only, it works fine, my Polycom
can display the video sent by FreeSWITCH, including when the active talker
is itself. The other SIP clients work fine as well.

When I configure FreeSWITCH to support H.264 only, the video switching only
works when Polycom is the active talker, otherwise all the users just see
the last video frame sent by Polycom.
If I do a peer-to-peer call between the Polycom and a SIP client, both
configured to use H.264, everything works just fine, which points me that
the problem could be related to the transition between viewing a video
stream with a given resolution and viewing another video stream with a
different resolution, or something related to the non-continuity of video
packets timestamp.

Is there anybody out there that have experienced similar issues? Do you
guys have any suggestion or anything that could help me to make it work

Thanks in advance.

Att. Mário Gasparoni.
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