When try to dial or transfer calls to Fax extension from another user extension i received busy tone. But if dial from Fax extension to another user extension or to an outside PSTN line it works fine. Any suggestion will be appreciated. Please find attached config file. Thanks
What you are seeing is expected behavior. Please refer to the caveat section in this document regarding non-user analog extensions:
I need to add that I was referring to transfer in my earlier post. Direct dialing of your extension 410 (fax) from any phone should work. The problem is likely caused by the fact that you have an ephone DN and a POTS dial peer with the same number (410). Please delete ephone-dn 12 and see if that helps.