[asterisk-users] Video calls using Cisco phones are 176x144(QCIF) and 15FPS both ways

Matt Rabbitt mrabbitt at chief-technologies.com
Mon Mar 31 08:47:39 CDT 2014

What would need to be changed in the source code to accommodate this?  Can
the imageattr attribute be hard coded into h264_format_attr_sdp_generate()
in res_format_attr_h264.c?

On Mon, Mar 31, 2014 at 9:07 AM, Joshua Colp <jcolp at digium.com> wrote:

> Matt Rabbitt wrote:
>> We are experiencing an issue with our Cisco 9971 and 8945 phones where
>> H264 video calls are connecting at 176x144 resolution instead of
>> 640x480.  Soft clients can connect at higher resolutions and the 9971
>> can even receive video at a higher resolution (although it still sends
>> 176x144).
>> I contacted one of the developers and he suggested the passthrough of
>> SDP attributes is not working correctly.  Has anyone else experienced
>> this problem?  We're running Asterisk 11.8.1.
>> Below are the video parts of the sip debug for one of the phones during
>> a video call.  Should I be seeing the "a=imageattr" in the SIP OK message?
> It looks as though the passthrough for "fmtp" is indeed working but as the
> "imageattr" attribute is currently unsupported/not used/not passed through
> it is probably causing your resolution problem.
> Cheers,
> --
> Joshua Colp
> Digium, Inc. | Senior Software Developer
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - US
> Check us out at: www.digium.com & www.asterisk.org
> --
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