To return a Linksys (or Sipura) analog telephone adaptor to an unconfigured state, pick up your attached phone handset and type the following:

****73738#

Press 1# to confirm. Hang up.

The device will reboot with a factory-default configuration. All previously entered configuration settings will be removed.

It is possible for service providers to restrict access to this feature. If you are using a SPA that has been provisioned by a provider, you may need the assistance of the service provider in order to perform this action.

To reset a SPA series phone to its original factory settings, click on the settings button, scroll down to 14 Factory Reset, press the select soft key, and then press the ok soft key to confirm.