Can I connect PBXtra to an Integrated Access T1?
If you have an integrated Access T1 line that supplies you with internet access and phone lines on the same circuit, you can connect those phone lines to PBXtra. If your existing IAD (T1 box) has RJ-11 ports on it, you can connect them to PBXtra Analog Line Ports using standard RJ-11 cables. If your IAD has both an incoming and outgoing T1 port, you can connect the outgoing port to a PBXtra T1/PRI interface card.