I am having an issue with a client that has 2 locations. Both locations use SPA512G phones with about 10-15 users per location. QoS settings and bandwidth is not an issue. The problem is all the phones will reboot throughout the day. At least 2-3 times. The phones are currently running on 7.5.2b firmware. Could this be the problem? I have seen threads talking about this issue with the SPA514G phones and the resolution to the problem was to upgrade to 7.5.5.
Configure Multicast Paging on the Cisco IP Phone 7800 Series or 8800 Series Multiplatform Phone
The Cisco IP Phone 7800 and 8800 Series Multiplatform Phones provide voice communication over an Internet Protocol (IP) network...
Add Call Park on a Cisco 7800 or 8800 Series Multiplatform Phone Key Expansion Module
Call park allows the user of the phone to put an incoming call on hold so that the call can be retrieved on another phone. A call is park...