I have found that the 7.1.7 on the 525g has an issue. There is no side tone. If you revert to the 7.1.3 you will have sidetone. However the handset volume output is lower with the 7.1.3 Cisco developers are comming out with a new beta and a full rev should be out next month
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...