I am having an issue with the FXO ports on a uc540. Occasionally the port does not release after you hang up a phone call. The call disconnects, but the green light remain lit and no other calls can be placed at that line. Obviously it is causing problems because the phone line on that port becomes inoperable and must be shutdown and turned up to start working again. Here are the results of the show voice call summary during the lockout.
0/0/0 - - - FXSLS_ONHOOK
0/0/1 - - - FXSLS_ONHOOK
0/0/2 - - - FXSLS_ONHOOK
0/0/3 - - - FXSLS_ONHOOK
0/1/0 - - - FXOLS_REMOTE_RELEASE
0/1/1 - - - FXOLS_REMOTE_RELEASE
0/1/2 - - - FXOLS_ONHOOK
0/1/3 - - - FXOLS_ONHOOK
0/4/0 g711ulaw n S_CONNECT EM_CONNECT
port 0/1/0 and 0/1/1 are the ports in question. I have not seen this behavior before in any of the UC520, UC540 or UC560's that I have dealt with and I am assuming that it is a carrier issue. Not sure what to look for. Any advise would help.
You should read this document.
Find out what type of disconnect the telco is using, and then you will be able to make this work.