I think I had a similar problem many years ago at a house. I don't remember all the details, but I do remember that the owner could not talk to the caller.

Just an FYI, when you select a line to make a call, you are muted util you dial a phone number. There may be a case where the phone system is thinking that you are trying to make an outgoing call instead of pickup up an incoming call.

At that time I tried to do an Immediate cut-though on the CO trunk. This worked but it completely messed up the redial function.

Another option is to create a new public numbering plan to use a single digit for an outgoing number. Next time the caller can not hear you , you can press the single digit and the Toshiba will assume that you dialed a valid number and un-mute your phone. You should be able to use a code that you would normally not dial, such as the * or #.

You can try this after you made sure that you don't have a handset, hook-switch, or cord issue.

David
Tele Express Business Systems