We have 3 UC520 units that are linked together over a WAN.
If one location calls another and gets put on hold, the hold music starts out really choppy for approximately 30-45 seconds and then clears up.
This does not happen if you call the location from an outside line or on internal calls.
I've been banging my head against the wall trying to figure out what is happening but I have yet to find anything. I've tried adjusting playout delays on dial peers, switching phone models, adjusting QoS settings all to no avail.
I'm running software pack 8.0.2 on all of my UCs currently and have had this issue since the units were first installed last year.