I was really struggling to get faxing working over the Cisco ATA when using the MSFT Teams SIP Gateway. The problem I had was trying to configure the ATA faxing parameters after the device was synced and talking to the MSFT SIP GW. The issue is that ...

Thanks to everyone who added information above. Adding a bit to it: I was able to get the Cisco 192 registered, but always got the fast busy when trying to register. For me that came down to 2 things: 1. I had MFA enabled for the user I was associati...