Extension to a ATA for Fax?

I am trying to use a grandstream for a fax. Has anyone setup an ATA with freepbx and then used it as a fax? I’m not having any luck

It is a normal extension. It just works. You may need to limit max fax speed or something, but it is simply a call.

Do you mean you cannot make the Grandstream connect properly as an extension and make and receive calls?

It registers fine, I have it setup with T38, but when you try to call the phone at the other end of the gateway it never rings.

Can you post a call log?

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