Cisco Systems OL-23092-01 manual Related Topics

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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network

Understanding Interactions with Other Cisco Unified IP Communications Products

Understanding How the Cisco Unified IP Phone Interacts with the VLAN

The Cisco Unified IP Phones 7975G, 7971G-GE, 7970G, 7965G, and 7945G 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 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)

•Data traffic to and from the PC connected to the switch through the access port of the IP phone (native VLAN)

Isolating the phones on a separate, auxiliary VLAN improves the quality of the voice traffic and allows a large number of phones to be added to an existing network where 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 related documentation at this URL:

http://cisco.com/en/US/products/hw/switches/index.html

Related Topics

•Understanding the Phone Startup Process, page 2-9

•Network Configuration Menu, page 4-5

Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5

 

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Contents A P T E R Related Topic Telephony Features Available for the Phone,Related Topics Providing Power to the Phone Power GuidelinesPower Type Guidelines Phone Screen Phone Power Consumption and Display BrightnessMax. Power Phone Model Power Configuration Switch BrightnessObtaining Additional Information about Power Power OutageUnderstanding Phone Configuration Files OL-23092-01 Purpose Related Topics Understanding the Phone Startup ProcessSee Understanding Phone Configuration Files Security Guide, Security by DefaultRequires MAC Method Address? Adding Phones with Auto-RegistrationAdding Phones with Auto-Registration and Taps Procedure Adding Phones with BATUnified IP Phone, Using Cisco Unified IP Phones with Different Protocols See Configuring Startup Network Settings,Converting a New Phone from Sccp to SIP Deploying a Phone in an Sccp and SIP Environment Determining the MAC Address of a Cisco Unified IP PhoneOL-23092-01
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