2-3
Cisco Unified IP Phone 7906G and 7911G Administration Guide for Cisco Unified CallManager 5.1
OL-11515-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Interactions with Other Cisco Unified Communications Products
Note If the Cisco Unified IP Phone model that you want to configure does not appear
in the Phone Type drop-down list in Cisco
Unified CallManager Administration,
go to the following URL and install the latest support patch for your version of
Cisco
Unified CallManager:
http://www.cisco.com/kobayashi/sw-center/sw-voice.shtml
Related Topic
• Telephony Features Available for the Phone, page 5-2
Understanding How the Cisco Unified IP Phone Interacts with
the VLAN
The Cisco Unified IP Phone 7911G has an internal Ethernet switch, which enables
forwarding of packets to the phone and to the network port and access port on the
back of the phone. The Cisco Unified IP Phone 7906G has an Ethernet port, which
enables forwarding of packets to the phone and to the network port.
If a computer is connected to the access port (Cisco Unified IP Phone 7911G), the
computer and the phone share the same physical link to the switch and the same
port on the switch. This shared physical link affects the VLAN configuration on
the network in the following ways:
• The current VLANs might be configured on an IP subnet basis. However,
additional IP address might not be available to assign the phone to the same
subnet as other devices connect to the same port.
• Data traffic present on the data/native VLAN may reduce the quality of
Voice-over-IP traffic.
• Network security may indicate a need to isolate the VLAN voice traffic from
the VLAN data traffic.
You can resolve these issues by isolating the voice traffic onto a separate VLAN.
The switch port that the phone is connected to would be configured to have
separate VLANs for carrying:
• Voice traffic to and from the IP phone (auxiliary VLAN, on the Cisco Catalyst
6000 series, for example)
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