To connect a landline phone to an Xfinity modem, plug a standard telephone into the gateway’s TEL 1 port using an RJ11 cable, and ensure you have active Xfinity Voice service. This process lets you set up landline phone service through your existing Xfinity internet connection, either for a single phone or to energize your home’s wired phone jacks.
What you need to connect a landline phone to an Xfinity modem
Before you start, confirm you meet these prerequisites:
- An active Xfinity Voice subscription. A data-only internet plan will not work.
- A voice-capable Xfinity gateway or modem that has phone ports. Standard data-only modems lack the necessary hardware.
- A standard landline telephone with an RJ11 plug.
- An RJ11 telephone cable (often included with the gateway or available at electronics retailers).
- The gateway must be powered on and connected to Xfinity internet for voice service to function.
Check your Xfinity modem has a phone port
Not every Xfinity modem supports landline connections. Look on the back of your gateway for a port labeled TEL 1, this is the voice port. If you are using a customer-owned modem or gateway, verify compatibility before purchasing by signing in to My Device Info on Xfinity’s website, entering your address, and selecting Search. The tool will confirm whether the device supports Xfinity Voice and the required internet speed. Voice-capable hardware is a separate consideration from internet-only equipment, so check specifically for phone port support.
Plug your phone into the TEL 1 port
- Locate the TEL 1 port on the back of your Xfinity gateway.
- Connect one end of the RJ11 telephone cable to the TEL 1 port.
- Connect the other end of the cable to your landline phone’s base or handset cord.
- Pick up the phone and listen for a dial tone. If you hear one, your phone is successfully connected.
Connect your home’s phone jacks to the Xfinity modem
To feed your existing house phone wiring, so every wall jack works, you need to run a standard modular phone cord from the gateway’s TEL 1 port to the nearest wall phone jack. However, a critical prerequisite: you must first disconnect the old telephone company’s inside wiring from the prior service. If the inside wiring was previously used by another provider, that wiring must be completely detached from their line before connecting it to Xfinity Voice. Once the old wiring is disconnected, plug the cord from TEL 1 into the wall jack; this energizes all jacks on that circuit. Note that the telephone line modem connector type is an RJ11 modular plug, which fits both the gateway’s voice port and standard wall jacks.
Troubleshooting: no dial tone or service issues
- Check for Xfinity outages first. Xfinity says to check for an outage in Xfinity.com or the Xfinity app first. Use Xfinity.com or the Xfinity app to see if there is a known service interruption in your area.
- Restart the gateway. In the Xfinity app, open WiFi > Troubleshoot > Restart your Gateway. Xfinity documents the same app flow on mobile devices: sign in with the Xfinity ID and password, then use the WiFi icon, choose Troubleshoot, and tap Restart your Gateway. Alternatively, Xfinity says you can restart equipment by unplugging power, waiting 30 seconds or 1 minute depending on the help page, then plugging it back in.
- Understand voice-modem light meanings. The gateway’s phone port status lights indicate whether the voice service is active. Refer to Xfinity’s support content for your specific gateway model to interpret the lights.
- Verify cable connections. Ensure the RJ11 cable is firmly inserted into both the TEL 1 port and the phone. Try a different cable if available.
Frequently Asked Questions
Can any modem work for Xfinity Voice?
No. The modem or gateway must be voice-capable and listed as compatible in Xfinity’s My Device Info tool. A standard data-only modem will not support phone service.
Can I keep my existing phone number?
Yes. Xfinity offers number porting, allowing you to transfer your current landline number to Xfinity Voice. You can request this during the setup or activation process.
Do I need extra equipment beyond the phone and cable?
No additional equipment is required for a single phone. If you want to use multiple phones through your home’s wired jacks, you only need the RJ11 cable and to disconnect the old provider’s wiring, no extra splitters or adapters are necessary.
How do I activate Xfinity Voice service?
Activation can be done through the Xfinity app by signing in with your Xfinity ID, then going to Account > Set up equipment or devices > Xfinity Gateway or Modem under the Internet section. The primary user or a manager must complete activation, which Xfinity's activation page says setup via the app can take about 20 minutes. Xfinity says the primary user or a manager must activate the device in the app.
What if I still have no dial tone after troubleshooting?
If you have checked for outages, restarted the gateway, and verified all cable connections, contact Xfinity customer support for further assistance. They can check your account status and help diagnose hardware issues.
