I have a customer who has an issue with video calls dropping out after 15 mins.
The customer reports that this happens with calls to their SX20 endpoint. The remote device could be either an 8945 IP phone, or a Jabber for windows client.
ie point-to-point call from SX20 to CP-8945G, or SX20 to J4W client.
The call drops out after 15 mins (ie 900 seconds).
Usually I would think this might be an issue with something like "Options ping". But this is an internal call.
Can anyone suggest a place to start?
This issue is more likely due to Session-Refresh timer. We (TAC) have created a external article for this issue. To begin with, I'd refer you to the below link:
There are a few more questions to follow:
1> Are all the endpoints registered to CUCM? Or are some registered to VCS?
2> Do you have any logs to share?
Alternatively, you can raise a TAC SR as well.
I have ran into this in the past and firewall configuration was the culprit. Try the call between endpoints on the same subnet and see if the issue persists.