I have a network as follows
ISDX PBX -- 3660 - 100 MB eth - 7206VXR - ISDX PBX
I am using TCCS for VOIP ( clear channel)and digital E1 modules at each router. The config works ok and all channels connect and voice is okay.
However after a few hours we see line/phase errors at the 3660 E1 controller which results in temporary channel loss as remote controller goes down.
Any suggestions as to why this is happening, the config has been checked as okay, timing ok , PBX's ok.