Cisco 7925G Administration Guide - Page 27
Establishing and Identifying Protected Calls, Security Restrictions - case
UPC - 882658201943
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Chapter 1 Overview of the Cisco Unified Wireless IP Phone 7925G Understanding Security Features for Cisco Unified IP Phones Note If the call is routed through non-IP call legs, for example, PSTN, the call may be nonsecure even though it is encrypted within the IP network and has a lock icon associated with it. In a protected call, a security tone plays at the beginning of a call to indicate that the other connected phone is also receiving and transmitting encrypted audio. If your call is connected to a non-protected phone, the security tone does not play. Note Protected calling is supported for connections between two phones only. Some features, such as conference calling, shared lines, Extension Mobility, and Join Across Lines are not available when protected calling is configured. Protected calls are not authenticated. Establishing and Identifying Protected Calls A protected call is established when your phone, and the phone on the other end, is configured for protected calling. The other phone can be in the same Cisco IP network, or on a network outside the IP network. Protected calls can only be made between two phones. Conference calls and other multiple-line calls are not supported. A protected call is established using this process: 1. A user initiates the call from a protected phone (protected security mode). 2. The phone displays the icon (encrypted) on the phone screen. This icon indicates that the phone is configured for secure (encrypted) calls, but this does not mean that the other connected phone is also protected. 3. A security tone plays if the call is connected to another protected phone, indicating that both ends of the conversation are encrypted and protected. If the call is connected to a non-protected phone, then the secure tone is not played. Note Protected calling is supported for conversations between two phones. Some features, such as conference calling, shared lines, Extension Mobility, and Join Across Lines are not available when protected calling is configured. Related Topics • Understanding Security Features for Cisco Unified IP Phones, page 1-8 • Understanding Security Profiles, page 1-12 • Security Restrictions, page 1-13 Security Restrictions When using a phone that is not configured for encryption, the user cannot barge into an encrypted call. When barge fails in this case, a reorder tone (fast busy tone) plays on the barge initiator phone. OL-15984-01 Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1) 1-13