TelePresence Server 8710 Resolution for presentation
We are using TPS 3.0(48) latest FCS version. We connect a third party SIP endpoint which supports H.264 and BFCP (No TIP).
We use this endpoint to display presentation video (video:slides) from TPS conference participants via BFCP.
Our SIP endpoint only supports XGA resolution for presentation (1024x768 @ 5 FPS), and when we answer the call from TPS we indicate it like this in SIP SDP 200 OK message:
Media Description, name and address (m): video 65512 RTP/AVP 126
Bandwidth Information (b): AS:4000
Media Attribute (a): sendrecv
Media Attribute (a): rtpmap:126 H264/90000
Media Attribute (a): fmtp:126 profile-level-id=42801F;max-fps=18000; max-rcmd-nalu-size=3320
Media Attribute (a): content:slides
Media Attribute (a): label:12
When meeting starts and one of the participants in TPS connects a laptop with XGA resolution, content is displayed correctly in our SIP third party endpoint, but...when resolution in laptop is set to a higher value we see TPS sending 720p resolution towards us. (EX60, MX200, EX90)
We analyzed the H264 streams and see the following:
Although there is no profile level defined for XGA in H.264, we use the most suitable which is 3.1.
Our requirement is that TPS will send to our endpoint exactly XGA, not lower and not higher. We expect the TPS to perform transcoding of the presentation to XGA prior to sending it to us. Is our SIP SDP incorrect, is there a way to achieve this?
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You can use the CLI command 'show risdb query sip' to check the status of SIP Trunks on Cisco Unified Communications Manager (Unified CM, CUCM).
admin:show risdb query sip
----------- SIP Information -----------
Number of SIP entries: 1
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