Hi,
We have a Avaya Partner ACS system that is only a couple of years old. Ever since we've moved from old AT&T pots lines over to Comcast digital lines we have not been able to see the incoming caller ID. A call to Comcast tech support got us to the "its the PBX system on not our line" answer. When I do plug in a regular single line phone to the Comcast line I do get the caller ID. This is the reason they give us the excuse. The fact that caller ID shows on a regular phone "it must be the phone system." It's a blame game I assume. Let me know if anything can be done to the ACS before I call Comcast to cancel their phone service. I'm regretting moving over to them.