Hi all,

My customer converted to AT&T Fiber with the CO lines broken out to SIP/analog on the AT&T ports, now after the move the customer is stating that they cannot hear the caller and what I experienced myself that I could barely hear them when I called.

The problem appears to be intermittent and in house calls sound fine.

I've done the calibration per NEC tech and that hasn't solved the issue.

I'm going to take a CO line simulator to site to compare My line versus AT&T

Any suggestions would be appreciated.

Thanks,

Mark