Bad video quality Room Kit Mini <> DX80 after 5 seconds

[Dries De Gendt]

Hi,

Lately, some new Cisco Room Kit Mini's where installed along with a Cisco DX80. All devices are registered to a 3rd party SIP server (hosted on our internal network) and connected to Cisco 1Gbps interfaces.

However, when we initiate a videocall, the image is only remains sharp for 5 seconds. After that, the resolution for both incoming and outgoing video drops to 512x288.

I've tried analyzing the logs and it appears that "Mari" is lowering the bandwith to 256Kbps for some reason.

2021-08-06T09:53:02.623+02:00 appl[3363]: Mari I: Rtp_RateAdjustment_cb: MainVideo, port 2370, new maxTotalRate:256 kbps current RtpRate:2920 kbps (new RtpBudget:192k), current FecRate:0 kbps (new FecBudget:0k), R:0, portRate: 2920 kbps, trafficCtrl: 3000 kbps

Disabling this experimental feature doesn't help either.

Does anyone have another suggestion? It appears like this has something to do with RTCP kicking in?

[Wayne DeNardi]

You could configure them for H.323 and make a call directly between them to confirm your network and the endpoints work correctly.  If then don't work that way, your network may be an issue (could be firewall ALG/inspection) - if they do work, then that suggests there is something in your SIP server that needs reconfiguring.