Yes I have used the ATA for connection to modems - like any analogue device the ATA is just an adaptor for them be used on VoIP be it modem, fax or phone.
Yes, we have them on Fax machines. I ran into a problem with the ATA dropping faxes but it was a timing issue. Works well now that problem is corrected.
The Call Manager was set to Clock Internal on the Gateway Endpoint, I set it to External and on the Gateway I set clock source line and network-clock-select 1 T1 0/0/0. On the ATA I set the AudioMode to 0X00150015
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