If I undestand correctly, you want the AA to see the fax tones, and direct the call to a fax that is hanging off of a ATA. Is that correct?
You're dealing with two different problems. One, the fax/call routing. The other is the issue with switching fax protocols on the ATA.
The link in the previous post deals with haveing an application detect fax tone, but it does not function very well as an AA. The caller calls in, waits N number of seconds while a voice says something like "press 1 if this is a voice call, 2 if fax...". If the caller presses to, or the script hears fax tone, the script knows how to negotiate the fax. However, it wants to do it with t.37 (or store and forward). Meaning the email will be sent via email to the address listed in the script.
CUE 3.1 has the ability to do store and forward. it's built into the code, and doesn't require the IOS tcl script noted in the previous paragraph. It's a great way to receive faxes.
That may be what you are looking for, but if you have a fax machine attached to an ATA, you're going to want to use t.38, or passthrough. My suggestion is that yaou make sure you're working with an ATA-188 and not the ATA-186.
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