The following is a simple guide that we are providing to our customers as an example of how to setup a ATA that is capable of T38 Faxing to register to FreePBX and passthrough T38 packets to our T38 Fax Trunks. Clearly IP Inc provides this as is and does not guarantee this setup will work for you and can not provide support for debugging such a setup.
Configuring Cisco ATA
Log into your Cisco ATA WebGUI and navigate to the Voice Line 1 option
Under the NAT and Network Settings set the following options
NAT Keep Alive Enabled - yes
Network Jitter Level - very high
Under the Proxy and Registration Settings section set the following fields
Proxy - Your FreePBX IP Address or FQDN of your PBX and what port SIP is setup with on your PBX such as 5060.
Register Expires - 300
Under Subscriber Information
Display Name - SIP Extension from your PBX
User ID - SIP Extension from your PBX
Password - SIP Extension Password/Secret from your PBX
Under Audio Configuration
Fax Passthru Method - ReINVITE
Fax T38 ECM Enable - yes
Echo Canc Enable - no
Fax Enable T38 - yes
Fax T38 Redundancy - 3
Fax Tone Detect Mode - callee only
Fax T38 Return to Voice - no
Save your changes and you should be able to send and receive T38 faxes through your PBX now.
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