I have a server that is hooked to a channel bank (Adit 600). It has eight lines coming from a T1 through this adit's FXO card. This particular * server is used primarily as a PBX and is not connected to the internet and has worked fine since 2006. However recently occasional calls are dropped with an Ahhn, Ahhn, Ahhn sound -- the kind of sound you hear if you leave the receiver of POTS phone off the look for too long. I have switched out the channel bank and it still happens. If I keep the CLI open I don't see any errors when this occurs -- however I can't be positive about this as it all happens very fast. I have also had my telco (XO Communications) out here several times. They say there is nothing wrong with the lines and that it has to be "my hardware" as the circuit is completing as we are able to talk briefly with the caller before the call is dropped. Nothing has been changed at all in the * servers configuration. The server has remained untouched and has not as much as been rebooted in a couple years.<br>
<br>Has anyone ever heard of a similar problem and can anyone suggest how I might fix or diagnose it?<br><br>Thank you very much for your time,<br><br>Richard <br>