Problem

Your Aastra IP phone's screen reads No Service or Web Apps. (This sometimes happens suddenly after weeks or months of working properly.)

Cause

The phone is unable to register with the SIP server.

Resolution

In cases where the phone had been properly working for a long time and is only suddenly afflicted with these error messages, a network power cycle is often able to clear it up.

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

You can also try setting a static IP on the phone, which has been known to help resolve these issues.

If the error persists, continue to the Extension Settings section of this troubleshooting.

Restart the phone (unplug it from the power source, then plug it back in). Watch for the following as it comes on:

  1. If the phone becomes stuck at 20%, click here for alternate steps.
  2. At 45%, it will try to download the config file.
  3. If it goes to 48% and displays a Bad Cfg File error, verify that there is a user profile assigned to the extension in Account Manager. We recommend you then contact 8x8 Technical Support.
  4. If it reaches 50% with no errors, proceed to the Troubleshooting tab.
  5. If the phone boots up but displays "No Service," verify that there is a user profile assigned to the extension in Account Manager.

Complete all of the following steps on the phone itself. Use the up and down arrow buttons to scroll through the menu options, and the right arrow button to select Enter.

Please note that your local phone settings (including speed dials, line key assignments, and forwarding) may be erased during this process.

Step 1: Erase local configuration.
  1. Press the Options button.
  2. Select Admin Menu, then press Enter.
  3. Enter password (typically 54321 or 22222), then press Enter.
  4. Select Erase Local Configuration.
  5. When the phone asks to restart, press Cancel.
  6. Wait for one minute. If this does not resolve the error, proceed to Steps 2 and 3.
Step 2: Factory reset the phone.

Note: The following will erase any local settings on the phone, such as speed dials, line key assignments, forwarding, etc.

  1. Press the Options button.
  2. Select Admin Menu, then press Enter.
  3. Enter password (typically 54321 or 22222), then press Enter.
  4. Select Factory Default.
  5. When prompted, allow the phone to restart itself.
  6. Continue below to Step 3.
Step 3: Disable certificate validation.
  1. Press the Options button.
  2. Select Admin Menu, then press Enter.
  3. Enter password (typically 54321 or 22222), then press Enter.
  4. Select Config Server.
  5. Select HTTPS Settings.
  6. Select Cert Validation.
  7. Select Enable, then change it from YES to NO.
  8. Confirm the change.
  9. Press GOODBYE to return to the main screen of the phone.
  10. Power-cycle the phone—disconnect it from the power source for 10 seconds, then reconnect and allow it to power on.

No resolution?

Contact 8x8 Technical Support.