Cisco 7965 Stuck at Upgrading Screen

I ran into this issue after factory resetting a Cisco 7965 phones  resulting in it being stuck at the upgrading screen while displaying the MAC address on the bottom left.

Here are a few things that should be checked to resolve this:
DHCP ip helper-address
Phone Load
DHCP Scope

Cisco Unity Express Compatibility Matrix

The following link shows the compatibility of Cisco Unity Express with CUCME, CUCM and Routers:
http://www.cisco.com/en/US/docs/voice_ip_comm/unity_exp/compatibility/cuecomp.htm

This can be used when integrating CUE with CUCM, as an example.

Creating Custom Backgroud Images for IP Phones

The following link explains the process for creating custom background images for Cisco IP phones:
http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7965g_7945g/6_1_3/english/administration/guide/7965cst.html#wp1088046