InternetCalls PAP2 SIP Settings
Below are the Line and SIP Setting screenshots that I used to get InternetCalls working with my PAP2. Simply adjust your default PAP2 settings to those highlit in the screenshots and replace the User ID, Password and Dial Plan with those of your own. Remember: Your dial plan should incorporate 00 as the international dialing prefix, these two digits should preceed all of your calls. Click here if you need assistance in writing your own dial plan.
Don't forget to enable STUN on the SIP settings page if you're experiencing one-way audio.