Ok, and you have the phone plugged into the modem without an issue?
If you access the modems control panel (for the MAX that should be http://10.0.0.138 and go to advance then telephony) what does it show the current status for phone connection?
If you access the modems control panel (for the MAX that should be http://10.0.0.138 and go to advance then telephony) what does it show the current status for phone connection?