Cisco 6901 Administration Manual page 3

Cisco Unified IP Phone and Telephony Networks
• The current VLANs might be configured on an IP subnet basis. However, additional IP addresses might
• Data traffic present on the VLAN supporting phones might reduce the quality of VoIP traffic.
• Network security may require 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. The switch port that the
phone connects 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)
• Data traffic to and from the PC connected to the switch through the access port of the IP Phone (native
Isolating the phones on a separate, auxiliary VLAN increases the quality of the voice traffic and allows a large
number of phones to be added to an existing network when there are not enough IP addresses for each phone.
For more information, refer to the documentation included with a Cisco switch. You can also access switch
information at this URL:
http://cisco.com/en/US/products/hw/switches/index.html
Related Topics
Phone Startup Process, on page 7
Cisco Unified IP Phone Network Settings Setup
Cisco Unified IP Phone and Cisco Unified Communications Manager Express
Interaction
When the Cisco Unified IP Phone works with the Cisco Unified Communications Manager Express (Unified
CME), the phones must go into CME mode.
When a user invokes the conference feature, the tag allows the phone to use either a local or network hardware
conference bridge.
The Cisco Unified IP Phones do not support the following actions:
Transfer
Conference
Join
Hold
Cisco Unified IP Phone and Cisco Unified Communications Manager Express Interaction
not be available to assign the phone to the same subnet as other devices connected to the same port.
VLAN)
Only supported in the connected call transfer scenario.
Only supported in the connected call transfer scenario.
Supported using the Conference button or Hookflash access.
Supported using the Hold button.
Cisco Unified IP Phone 6901 and 6911 Administration Guide for Cisco Unified Communications Manager 10.0 (SCCP
and SIP)
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