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Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)
OL-20861-01
Chapter 8 Configuring Features, Templates, Services, and Users
Telephony Features Available for the Cisco Unified IP Phone
Automatic Port
Synchronization
When the Cisco Unified CM administrator uses the
Remote Port Configuration feature to set the speed
and duplex function of an IP phone remotely, loss
of packets can occur if one port is slower than the
other.
The Automatic Port Synchronization feature
synchronizes the ports to the lowest speed among
the two ports, which eliminates packet loss. When
automatic port synchronization is enabled, it is
recommended that both ports be configured for
autonegotiate. If one port is enabled for
autonegotiate and the other is at a fixed speed, the
phone synchronizes to the fixed port speed.
Note If both the ports are configured for fixed
speed, the Automatic Port Synchronization
feature is ineffective.
Note The Remote Port Configuration and
Automatic Port Synchronization features
are compatible only with IEEE 802.3AF
Power of Ethernet (PoE) switches.
Switches that support only Cisco Inline
Power are not compatible. Enabling this
feature on phones that are connected to
these types of switches could result in loss
of connectivity to Cisco Unified CM, if the
phone is powered by PoE.
To configure the parameter in the Cisco
Unified CM Administration application,
choose Device > Phone, select the appropriate
IP phones, and scroll to the Product Specific
Configuration Layout pane.
To configure the setting on multiple phones
simultaneously, enable Automatic Port
Synchronization in the Enterprise Phone
Configuration (System > Enterprise Phone
Configuration).
Barge Allows a user to join a non-private call on a shared
phone line. Barge features adds a user to a call and
converts it into a conference, allowing the user and
other parties to access conference features.
Note The Cisco Unified IP Phone can still use
barge when the Built in Bridge Enable
service parameter is set to off. To prevent a
user from using the barge feature on the
The Cisco Unified IP Phone, you must
disable Barge in Feature Control Policy for
the phone.
For more information, refer to:
• Cisco Unified Communications Manager
Administration Guide, “Cisco Unified IP
Phone Configuration” chapter.
• Cisco Unified Communications Manager
System Guide, “Cisco Unified IP Phone”
chapter.
• Cisco Unified Communications Manager
Features and Services Guide, “Barge and
Privacy” chapter.
• Cisco Unified Communications Manager
Administration Guide, “Feature Control
Policy Configuration.”
Table 8-1 Telephony Features for the Cisco Unified IP Phone (continued)
Feature Description Configuration Reference