Cisco Unified IP Phones are full-feature telephones that provide voice communication over the data network that your computer uses, which allows you to place and receive phone calls, put calls on hold, transfer calls, make conference calls, and so on.
In addition to basic call-handling features, your phone can provide enhanced productivity features that extend your call-handling capabilities. Depending on the configuration, your phone supports:
Access to network data, XML applications, and web-based services.
Online customizing of call features and services from your Cisco Unified Communications Manager User Options web pages.
A comprehensive online help system that displays information on the phone screen.