Can anyone offer any advice for configuring a Cisco SPA112 for faxing with 3CX using a fax machine for both incoming and outgoing faxes? I know it's not a supported device by 3CX but I also know others have done it with success. I currently have one in a test environment and one deployed. The one in the test environment will send but won't receive and the one deployed to a client will receive but won't send. When I send a fax, I hear the handshake but the fax always fails with a communication error. Thanks for any help.