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Yealink SIP-T46S IP Phone: Phone Displays No Service
8x8 Support

Yealink SIP-T46S IP Phone: Phone Displays No Service

Symptom

Yealink SIP-T46S phone LCD display shows the message No Service. There is no dial tone, and you are unable to make or receive calls. 

Applies To

Yealink SIP-T46S

Resolution

Troubleshooting

  1. In cases where the phone had been properly working for a long time and is only suddenly afflicted with these error messages, power cycling your network is often able to clear it up.
  2. Next , check if the firmware is up-to-date. Recommended Firmware is 66.84.0.15
    • Check the firmware of the phone by pressing the OK button.
    • Another way to check the version is via Web GUI by obtaining the IP address from the phone or the Client list table from your router.
      • Login to the phone's IP address (default user/password: admin/admin)
      • Navigate to "Status > Status > Firmware Version"

Firmware.PNG

3.  If the firmware does not match the recommended you can download the firmware version here.

  • Download the T46S(T48S,T42S,T41S)-66.84.0.15.rom file.
  • Next, go to "Settings > Upgrade > Select and Upgrade Firmware."
  • Click "Choose File" choose the firmware file saved previously, and press "Upgrade."
  • The phone will reboot and update it's firmware, once done proceed to the next step.

4.  Make sure to provision the phone to 8x8 server.

  • Go to "Settings > Auto Provision" 
    • Enter Server URL: https://ylcfg.8x8.com/yealink/
    • Click on Autoprovision Now
    • The phone will reboot twice and once booted, will have the chance to Activate.

 

Other helpful network troubleshooting:

  • Swap out the Ethernet cord connecting the phone to the network for a different one (to see if a faulty cord might be the issue).
  • Is the phone connected to a wall jack? If so, try connecting it directly to a networking device (router or switch).
  • If the phone is connected to a networking device, try plugging it into a different port on the device (to see if a faulty port is the issue).
  • If accessible, review the firewall/router settings and be sure to disable the following:
    • SIP-ALG
    • SPI
    • Firewall

Try setting a static IP on the phone, which has been known to help resolve these issues. 

Cause

  • Phone has an Outdated firmware
  • Phone is unable to successfully register a SIP account with our services.

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