Calls cut out after 7 to 13 minutes

[kkayace]

Call to or from the site are cutting out after 7 to 13 minutes.

I'm not sure what information would be needed to help me fix this issue but i am willing to provide what ever is needed.
i have attached a pcap from our provider Prodosec.

[david55]

The channel technology for a start. You need to turn up the channel driver debugging until you get a clear indication of which side is clearing and, at least if it is Asterisk, why.

A variable delay is strange, but the typical cause is a router's dynamic rule timing out. It could also be a session timers failure.