We made the switch to SIP over cable and I too would not recommend it, calls will drop or not ring at all. I have calls forwarded to a POTS so we don't miss calls when the cable drops or has high ping times. Lucky Comcast has extended Ethernet over fiber in my area, 10mg = $500 Sent from Cisco Technical Support iPad App
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You can't transfer CO lines, just add the button to the other phones. These lines are put on hold and picked up from other phones with that CO line.
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