The XB202204CH X16 (4) phone system bundle is equipped to support (4) outside telephone lines and can support up to (6) outside telephone lines. The (2) port telephone line expansion card (1630-00) can be purchased individually and added installed in the X16 server as an option to expand the system to connect to (6) outside telephone lines. X16 6-line Phone System with Speaker Phone in a 4-pack bundle, Titanium Metallic finish... The X-16 includes a Voice Mail System and Automated Receptionist as standard features! Each phone features (6) telephone lines, (16) digital speakerphones and (4) voice mail ports with 2 hours of message storage.