The phones are PoE from either the Cisco 3548 switches or a Power Dsine PoE midspan. We have 5 different buildings on the campus all using Cisco PoE switches or non-PoE Cisco switches and the Dsine PoE midspans.
The phones are running the most recent firmware which is 3.1.8.
This problem was not happening until we upgraded this site from older Polycom firmware and and older version of FreePBX and Asterisk. We are currently rinning FreePBX distro 1.812.210.
We are having the same reboot problem at another site that is also running the same Polycom firmware and FreePBX/Asterisk version.