When the phone gets to the '* for program' prompt, press '*', then just hit '#' through the prompts until it gets to 'command', then press mute, 73738 (RESET) and then it should reboot and have all the settings reset...
Are you sure your VLAN is routing from the network segment? Could be the DHCP broadcast is picking up the VLAN ID (855) from option 176 but that VLAN might not be trunked to your registration point or the voice VLAN might not be configured on the switchport. Just a thought.
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