Cisco IP Phone 7800 Series - Secure Calls

Secure Calls
Your administrator can take steps to protect your calls from tampering by people outside your company. When
you see a lock icon displayed on your phone during a call, your phone call is secure.
Cisco IP Phone 7800 and 8800 Series, Cisco IP Conference Phone 7832, and Cisco ATA 190-SC User Guide for Webex Calling (formerly Spark
Call)
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Make Basic Calls from Your Conference Phone
Secure Calls