From the UC500 Q&A, meaning you don't need to buy anything additional to use 2 or 4 IP Communicator:
Yes, the Cisco Unified Communications 500 Series supports Teleworker configuration. There are two Teleworker licenses that can be registered to the Cisco Unified Communications 500 Series 8-user and 16-user configurations in addition to the 8 or 16 IP phones physically connected to the PoE ports on the system. Additionally, four Teleworker licenses can be registered to the Cisco Unified Communications 500 Series 32 user- and 48-user configurations in addition to the 32 or 48 IP phones physically connected to the system through PoE ports. These licenses can be applied to remote teleworkers, to local Cisco Unified Wireless IP Phone 7921G models, or to Cisco IP Communicator softphone clients (offsite or local). Customers choose how these additional licenses are deployed. The Cisco Unified Communications 500 Series supports Easy VPN server and uses the Cisco 871 Integrated Services Router as the Easy VPN remote. Easy VPN server supports Cisco VPN client and Microsoft VPN client.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...