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Small Business Resources / Troubleshooting

Grandstream ATA Phone port Status LED is not on or connected analog devices have no dial tone

Last Updated: July 21, 2025

Try the following troubleshooting steps if the Status LED is off or if analog devices have no dial tone:

  • Check to make sure the telephone adaptor has been added to your Ooma Office Manager account.
  • Make sure the port you want to use is assigned to an Ooma Office user.
  • If the device is already assigned to a user, restart the ATA by disconnecting its power, wait for 30 seconds, and thenreconnect its power supply.
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