2-3
Cisco Unified IP Phone 7906G and 7911G Administration Guide for Cisco Unified CallManager
OL-10008-01
Chapter2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Interactions with Other CiscoUnified 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 CiscoUnified 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, page5-2
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:
•Although current VLANs might be configured on an IP subnet basis,
additional IP addresses may not be available to assign the phone to the same
subnet as other devices that 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 necessitate the isolation of the VLAN voice traffic
from the VLAN data traffic.
You can resolve these issues by isolating the voice traffic onto a separate VLAN,
so that the switch port to which the phone is connected uses separate VLANs for
the following types of traffic:
•Voice traffic to and from the IP phone (auxiliary VLAN, on the
Cisco Catalyst 6000 series, for example)