Depending on your modem the return result of the ATD%s might help. A return on 82 may be of interest.
NexCom 300 Modem Commands
82 FAX CALLING TONE DETECTED
When answering a call, the
modem has detected a fax calling
Not sure if this in incomming or outgoing though
AT+FCON Facsimile Connection
This response indicates connection with a Fax machine.
Hope it helps
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