On occasions I notice that our incoming voice message (on IVR) and music-on-hold audio is jerky. At first I thought the file sizes were too big so I reduced them down to <200k each. This didn't help. The server I'm running 3CX on is quite beefy - 4Gb RAM, plenty hard drive space and dual xeon processor. I do have some other stuff running on this machine but processor and RAM utilization is low. I am running 3CX on three ISDN lines ie 6 lines in total, thru a Patton box. Any ideas?