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

Yealink SIP-T46S IP 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

  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 OK.
    • Another way to check the version is via the web GUI by obtaining the IP address from the phone or the Client list table from your router.
      • Log in 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 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  • Phone has an Outdated firmware.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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