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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
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An Overview of the Cisco Unified IP Phone
The Cisco Unified IP Phones 7970G/7971G-GE are full-featured telephones that
provide voice communication over an Internet Protocol (IP) network. They
function much like digital business telephones, allowing you to place and receive
phone calls and to access features such as mute, hold, transfer, speed dial, call
forward, and more. In addition, because Cisco Unified IP Phones are connected
to your data network, they offer enhanced productivity features, including access
to network information, XML applications, and customizeable features. The
phones also support security features that include file authentication, device
authentication, signaling encryption, and media encryption.
The Cisco Unified IP Phones 7970G/7971G-GE provide a color touchscreen,
support for up to eight line or speed dial numbers, context-sensitive online help
for buttons and features, and a variety of other sophisticated functions.
The Cisco UnifiedIP Phone, like other network devices, must be configured and
managed. The phone supports G.711aLaw, G.711uLaw, G.729, G.729a, G.729b,
G.729ab audio compression, and G.722 wideband.
This chapter includes the following topics:
•Understanding the Cisco UnifiedIP Phones 7970G/7971G-GE, page 1-2
•What Networking Protocols Are Used?, page1-5
•Understanding the SIP Protocol, page1-8
•What Features are Supported on the Cisco
UnifiedIP Phones 7970G/7971G-GE?, page 1-9
•Understanding Security Features for Cisco Unified IP Phones, page1-12