We have an HDX-8000. When we attempt to call a commercial number point-to-point down a specific group of trunks to a VOIP Switch, we experience video drops, starting about 5-10 min into the call and then again about every 5-10 min for the duration of the call. We still have audio but no video. Calls do not drop, just the video will drop then come back.
We have another trunk path we can dial down to a Defensed Switch Network number vs a commercial number and those calls do not experience the same video-drop outs.
The PBX here is an Avaya Definity 8720, this in turn is sending our calls to a VOIP switch, not sure at this time the exact name of that VOIP switch. This is only ISDN PRI calls, we are not using IP calls.
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It is always useful to include the currently used Software version as issues experienced may already be addressed in a newer release.
This also allows yourself and others to check against current software release notes.
You have already done most of your troubleshooting by isolating that this only happens on a certain trunk.
Based on this information and the fact that it is some kind of VoIP trunk compression is being used and obviously limiting the ISDN bandwidth of 64Kbits per individual channel to something else or even getting out of sync.
The next step would be to work with the provider of this service to troubleshoot this on their end and to ensure that you get the full bandwidth of a PRI trunk.
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