To connect a telephone line to your NETGEAR Nighthawk CM1150V Voice Cable Modem:
- Connect one end of the phone cable to the Tel1 (Voice) port on the rear panel of the modem.
- Connect the other end of the phone cable to the telephone.
- Call Comcast XFINITY customer service at 1-800-XFINITY (1-800-934-6489) or 1-855-OK-BEGIN and ask them to register the phone lines.
The Tel (Voice) LED blinks while the phone is being registered and then displays solid white.
Note: After the voice line is registered, a dial tone is audible when the phone is off the hook.
For more information, see How can I troubleshoot my cable modem?.
Last Updated:07/07/2025
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Article ID: 000060508