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Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 6.0
OL11954-01
Chapter 1 An Overview of the Cisco Unified IP Phone
Understanding Security Features for Cisco Unified IP Phones
on page 4-32 for more information. If you do not disable this port and
subsequently attempt to attach a PC to it, the switch will deny network
access to both the phone and the PC.
• Configure Voice VLAN—Because the 802.1X standard does not account for
VLANs, you should configure this setting based on the switch support.
–
Enabled—If you are using a switch that supports multi-domain
authentication, you can continue to use the voice VLAN.
–
Disabled—If the switch does not support multi-domain authentication,
disable the Voice VLAN and consider assigning the port to the native
VLAN. See the “Security Configuration Menu” section on page 4-32 for
more information.
• Enter MD5 Shared Secret—If you disable 802.1X authentication or perform
a factory reset on the phone, the previously configured MD5 shared secret is
deleted. See the “802.1X Authentication and Status” section on page 4-43 for
more information.
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 barge initiator's phone.
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 Communications Manager 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.
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