That is correct. Speed dials like this just follow the next available button on the phone. You can have line buttons on the 500S as well. If using a 525, it would be button 6 as the first button on the 500s. Speed dials just follow after all of the buttons.
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...