Cisco 7961G - Understanding How the Cisco Ip Phone Interacts with the Vlan

2-3
Cisco IP Phone Administration Guide for Cisco CallManager, Cisco IP Phone 7961G/7961G-GE and 7941G/7941G-GE
OL-6966-01
Chapter 2 Preparing to Install the Cisco IP Phone on Your Network
Understanding Interactions with Other Cisco IP Telephony Products
For information about configuring Cisco CallManager to work with the
IP devices described in this chapter, refer to the Cisco CallManager
Administration Guide, the Cisco CallManager System Guide, and to the Cisco
CallManager Security Guide.
For an overview of security for the Cisco IP Phone, see the “Understanding
Security Features for Cisco IP Phones” section on page 1-11.
Note If the Cisco IP Phone model that you want to configure does not appear in the
Phone Type drop-down list in Cisco CallManager Administration, go to the
following URL and install the latest support patch for your version of
Cisco CallManager: http://www.cisco.com/kobayashi/sw-center/sw-voice.shtml
Related Topic
• Telephony Features Available for the Cisco IP Phone, page 5-2
Understanding How the Cisco IP Phone Interacts with the VLAN
The Cisco IP Phone 7961G/7961G-GE and 7941G/7941G-GE have an internal
Ethernet switch, enabling forwarding of packets to the phone, and to the access
port and the network port on the back of the phone.
If a computer is connected to the access port, the computer and the phone share
the same physical link to the switch and share the same port on the switch. This
shared physical link has the following implications for the VLAN configuration
on the network:
• The current VLANs might be configured on an IP subnet basis. However,
additional IP addresses might not be available to assign the phone to the same
subnet as other devices connected to the same port.
• Data traffic present on the VLAN supporting phones might 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.