How to Factory Reset your Phone

This guide provides instructions on how to factory reset all the phones supported by 3CX Phone System. Factory reset will take the phone to the original device settings. This is useful when you cannot get the phone to work and would like to start with a fresh configuration. Most of the phone guides on our blog assume that the phone has been factory reset.

Search for the model of your phone in the following table and use the instructions as needed.

Note: When you Factory Reset your phone, all the settings that you have configured in the device will be lost. You would need to re-provision or re-configure the phone after doing a factory reset.

Cisco 303, Cisco 502g, Cisco 504g, Cisco 508g, Cisco 509g, Cisco 525g


From the phone, navigate to the Menu of the phone > Select Option 14 to factory reset the phone > Press OK

Yealink T-20, T-22, T-26, T-28, T32, T38


Keep “OK” pressed for 10 seconds and then press OK to confirm factory reset

OR On the phone itself, navigate to Menu > Settings > Advanced Settings > Enter the phone password (Default: admin) > Select ‘Reset to Factory’, and press OK. Confirm that you want to reset to factory settings.

Polycom IP 301, 501, 550, 601, 650 and 670


Press and hold 4, 6, 8 and *. You will need the admin password to proceed with factory reset. The default password is ‘456’

Polycom IP 320, 321, 330, 331, 335, 430, 450, 560 and 7000


Press and hold 1, 3, 5 and 7. You will need the admin password to proceed with factory reset. The default password is ‘456’

Polycom IP 4000, 5000 and 6000


Press and hold 6, 8 and *. You will need the admin password to proceed with factory reset. The default password is ‘456

Polycom VVX 1500


Press and hold 2,4 and 6. You will need the admin password to proceed with factory reset. The default password is ‘456’

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  1. Craig

    Amazed that some phones can be factory reset by any user who knows how to do it without a password… Makes more work for the admins.
    All phones should require password for factory reset… And if you forgot the password, then have a method to put the phone into a recovery mode and TFTP new firmware or something.

    August 10, 2012 at 4:22 am
  2. Pingback: SIP Trunks | SIP Trunking » How to Factory Reset your Phone

  3. Igor Snezhko

    Panasonic phones are absent. Please add.

    August 15, 2012 at 4:32 am
  4. @Igor,

    we are not allowed to publish this information how to reset a Panasonic desktop/dect phone.
    You have to get in touch with Panasonic to aq. this information. Sorry

    August 20, 2012 at 9:15 pm
  5. Daryl @ VoIP Systems Sarasota

    When you do a reset for one phone at your location will that effect other phones on your network?

    August 23, 2012 at 9:18 am
  6. Nicholas Sciberras

    @Daryl,

    No, a reset to one phone in your network will not affect the other phones in the network.

    August 27, 2012 at 6:14 pm