I have the strange situation that an H323 gateway (2801) that is connected to a FAX server sometimes forgets to close the B-channels.
For example I execute "show voice call status" I get the message: No active calls found. But when I do a "show isdn status" I see that Layer 3 has 2 Active calls.
The result is of cource that you receive a busy tone.
Although I have not figured out what is causing this, I would like to know if there is a command that says: "if there are no active calls, clear the ISDN interface" It would saolve this problem.