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Cisco Unified IP Phone Guide for Cisco Unified Communications Manager 8.5(1) (SCCP and SIP) 47
Making and Receiving Secure Calls
Depending on how your system administrator configured your phone system, your phone may support
making and receiving secure calls.
Your phone can support these types of calls:
• Authenticated call—The identities of the phones participating in the call have been verified.
• Encrypted call—The phone is receiving and transmitting encrypted audio (your conversation)
within the Unified CM network. Encrypted calls are authenticated.
• Protected call—The phone is a secure (encrypted and trusted) device on the Unified CM server and
is configured as a “Protected Device” in Unified CM Administration.
If “Play Secure Indication Tone” is enabled (True) in Unified CM Administration, the protected
phone plays a secure or nonsecure indication tone at the beginning of the call:
–
When end-to-end secure media is established through the Secure Real-Time Transfer Protocol
(SRTP) and the call status is secure, the phone plays the secure indication tone (three long
beeps with brief pauses).
–
When end-to-end nonsecure media is established through the Real-Time Protocol (RTP) and
the call status is nonsecure, the phone plays the nonsecure indication
tone (six short beeps
with brief pauses). (This capability is a change with this
release.)
If the Play Secure Indication Tone option is disabled (False), no tone is played.
• Nonprotected call—The phone does not have a “Protected Device” status in Unified CM. No
secure or nonsecure indication tone is played.
• Nonsecure call—The phone is not protected on the Unified CM server and the call status is
nonsecure.
For more information, see your system administrator.
Your system administrator also configures the VPN Client feature as needed. If it is enabled and the
VPN Client mode is enabled on the phone, you are prompted for your credentials as follows:
• If your phone is located outside the corporate network—You are prompted at login to enter your
credentials based on the authentication method that your system administrator configured on
your
phone.
• If your phone is located inside the corporate network—
–
If Auto Network Detection is disabled, you are prompted for credentials, and a VPN
connection is possible.
–
If Auto Network Detection is enabled, you cannot connect through VPN so you are not
prompted.