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The fax through ATA stopped to work after the Cisco CallManager Region Configuration changed to use G729 codec for calls to ATAs
Analog telephone adaptors (ATAs) have a hardware limitation that only allows one port to establish calls with the use of the G729 codec. In the case of ATAs that use the Skinny Client Control Protocol (SCCP) in order to register with Cisco CallManager, this port is hardcoded by default to port 0, and therefore port 1 can only use G711 to establish calls.
Since this is a hardware limitation for ATA, it is necessary to revert the Region Configuration on Cisco CallManager to use G711 codec.