My problem endpoints have 10 mbps bandwidth and 1 mbps SD video stream. Where I check network? vTS and CUCM is connected at 100 mbps channels to network.

Any ideas? What services I'm must check?

Are there any firewalls between the endpoints and the TelePresence server?

Endpoints showing video for a while, then stopping, and at a relatively consistent timing interval, suggests that there may be a firewall session timeout occurring somewhere within your network.

I'm have no any firewalls between endpoints and the TelePresence server.

I watched the log and a few items seemed strange to me:

 2184 2017/06/30 13:46:14.897 MEDIA                    Info      call N253: reported transmit packet loss: audio: 2 (0.1%), main video: 4294967293 (100.0%), extended video: 0 (0.0%)
     2221 2017/06/30 13:58:24.309 MEDIA                    Info      call N253: reported transmit packet loss: audio: 0 (0.0%), main video: 33 (1.2%), extended video: 0 (0.0%)
     2262 2017/06/30 14:17:37.290 MEDIA                    Info      call N253: reported transmit packet loss: audio: 0 (0.0%), main video: 18 (0.6%), extended video: 0 (0.0%)
     2290 2017/06/30 14:42:20.756 MEDIA                    Info      call N253: reported transmit packet loss: audio: 0 (0.0%), main video: 14 (0.5%), extended video: 0 (0.0%)
     2304 2017/06/30 14:52:52.789 MEDIA                    Info      call N253: reported transmit packet loss: audio: 1 (0.0%), main video: 4294967123 (100.0%), extended video: 0 (0.0%)

~2^32 loss packets since 14:42:20 to 14:52:52? Is this really not a bug?

Video closed on this endpoint just at 14:52:53...

While a call is in progress, check the network switches and anything in between the endpoint and the TelePresence Server to see if you can locate what is causing the packet loss, possible issues could be a misconfigured QoS on a switch or something else consuming all the bandwidth.