Chapter 1 An Overview of the Cisco Unified IP Phone

Understanding Security Features for Cisco Unified IP Phones

In an encrypted call, all devices participating in the establishment of the call are authenticated by the Cisco Unified CallManager. In addition, call signaling and media streams are encrypted. An encrypted call offers the highest level of security, providing integrity and privacy to the call. When a call in progress is being encrypted, the call progress icon to the right of the call duration timer in the phone LCD screen changes to the following icon:

Note If the call is routed through non-IP call legs, for example, H.323 or PSTN, the call will be nonsecure even though it is encrypted within the IP network and has a lock icon associated with it.

Related Topic

Understanding Security Features for Cisco Unified IP Phones, page 1-12

Security Restrictions, page 1-21

Supporting 802.1X Authentication on Cisco Unified IP Phones

These sections provide information about 802.1X support on the Cisco Unified IP Phones:

Overview, page 1-18

Required Network Components, page 1-19

Best Practices—Requirements and Recommendations, page 1-19

Overview

Cisco Unified IP phones and Cisco Catalyst switches have traditionally used Cisco Discovery Protocol (CDP) to identify each other and determine parameters such as VLAN allocation and inline power requirements. However, CDP is not used to identify any locally attached PCs, therefore Cisco Unified IP Phones provide an EAPOL pass-through mechanism, whereby a PC locally attached to the IP phone, may pass through EAPOL messages to the 802.1X authenticator in

 

 

Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones

 

 

1-18

 

OL-11524-01

 

 

 

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Cisco Systems 7970G manual Supporting 802.1X Authentication on Cisco Unified IP Phones, Related Topic