How do I switch my landline phones from our old phone modem (Arris B TM502G) to the newer gateway (Cisco DPC 3941T)? I have tried many different ways to un-plug/plug-in the phone line and the coaxial cables, but have no luck using the Cisco for phone service. No dial-tone, no TEL lights. This unit has been activated long ago for internet and wi-fi. Any advice?
... View more