Cisco 7961G Administration Guide - Page 50

Understanding Security Features for Cisco Unified IP Phones Chapter 1 An Overview of the Cisco Unified IP Phone Related Topic • Understanding Security Profiles, page 1-17 • Understanding Security Features for Cisco Unified IP Phones, page 1-11 • Security Restrictions, page 1-18 Security Restrictions A user cannot barge into an encrypted call if the phone that is used to barge is not configured for encryption. When barge fails in this case, a reorder tone (fast busy tone) plays on the phone on which the user initiated the barge. If the initiator phone is configured for encryption, the barge initiator can barge into an authenticated or nonsecure call from the encrypted phone. After the barge occurs, Cisco Unified CallManager classifies the call as nonsecure. If the initiator phone is configured for encryption, the barge initiator can barge into an encrypted call, and the phone indicates that the call is encrypted. A user can barge into an authenticated call, even if the phone that is used to barge is nonsecure. The authentication icon continues to appear on the authenticated devices in the call, even if the initiator phone does not support security. 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 1-19 • Required Network Components, page 1-19 • Best Practices-Requirements and Recommendations, page 1-20 1-18 Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE Administration Guide for Cisco Unified CallManager OL-11528-01