How to reset the Avaya 5610 phone to defaults

When the phone boots up press * to modify settings.
Keep pressing # to get to the "Enter Command" screen.
Press "HOLD" key once and then press 25327
After that press # and confirm the reset to defaults action.

VLAN and IP Phones

http://marketingtools.avaya.com/knowledgebase/ipoffice41en/mergedProjects/ipphoneinst/index.htm?vlanandipphones.htm