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8x8 Support

Internal Server Error on Cisco IP Phones and ATA Adapters


Your Cisco SPA phone or ATA adapter reads Internal Server Error and prevents dialing out.

Applies To

  • Cisco SPA phones
  • Cisco ATA adapters


  1. Lift handset (or initialize speakerphone).
  2. Dial * 6 8.
  3. Hang up.
  4. Wait about 30 seconds, then attempt dial out again.


Most likely, you may have attempted to use (or inadvertently dialed) an invalid or unsupported "star code," such as * 6 7 or * 6 9, which is known to cause this error.

Additional Information

See below for lists of supported star codes for:

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