DTMF routing

 

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The method Zetafax uses for DID routing is to recognize DTMF tones sent to the fax server just after it answers the call, telling it what number was dialed. These are the musical tones generated by most telephones when the number keys are pressed.

 

Even without giving each user their own fax number, you can still get the same effect by getting the sender to key in extra digits after Zetafax answers the call. This is normally done by adding them to the fax number, after a few "pause" characters. Because of the relatively high level of sophistication required this is suitable for expert fax senders only!