NO DIAL TONE AFTER NEW GATEWAY INSTALLED.

I just updated my old Xfinity Modem to the new Gateway (white) and am having an issue, no landline dial-tone. Before you ask, everything worked well for about a decade. No changes or upgrades except for the new Gateway. The phone jack is plugged into 1. I tried the other ports just for the heck of it, nothing no change, no dialtone..... I believe I need the "provisioning" done behind the scenes....can someone please do this for me?