Cisco Systems UNIFIED OL-23092-01 User Manual
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C H A P T E R 2

Preparing to Install the Cisco Unified IP Phone on Your Network

Cisco Unified IP Phones enable you to communicate using voice over a data network. To provide this capability, the IP Phones depend upon and interact with several other key Cisco Unified IP Telephony and network components, including Cisco Unified Communications Manager, DNS and DHCP servers, TFTP servers, media resources, Cisco prestandard PoE, and so on.

This chapter focuses on the interactions between the Cisco Unified IP Phones 7975G, 7971G-GE,7970G, 7965G, and 7945G and Cisco Unified Communications Manager, DNS and DHCP servers, TFTP servers, and switches. It also describes options for powering phones.

For related information about voice and IP communications, refer to this URL:

http://www.cisco.com/en/US/products/sw/voicesw/index.html

This chapter provides an overview of the interaction between the Cisco Unified IP Phone and other key components of the Voice over IP (VoIP) network. It includes these topics:

Understanding Interactions with Other Cisco Unified IP Communications Products, page 2-2

Providing Power to the Phone, page 2-4

Understanding Phone Configuration Files, page 2-7

Understanding the Phone Startup Process, page 2-9

Adding Phones to the Cisco Unified Communications Manager Database, page 2-11

Using Cisco Unified IP Phones with Different Protocols, page 2-14

Determining the MAC Address of a Cisco Unified IP Phone, page 2-15

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

 

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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 Interactions with Other Cisco

Unified IP Communications Products

To function in the IP telephony network, the Cisco Unified IP Phone must be connected to a networking device, such as a Cisco Catalyst switch. You must also register the Cisco Unified IP Phone with a Cisco Unified Communications Manager system before sending and receiving calls.

This section includes these topics:

Understanding How the Cisco Unified IP Phone Interacts with Cisco Unified Communications Manager, page 2-2

Understanding How the Cisco Unified IP Phone Interacts with the VLAN, page 2-3

Understanding How the Cisco Unified IP Phone Interacts with Cisco Unified Communications Manager

Cisco Unified Communications Manager is an open and industry-standardcall processing system. Cisco Unified Communications Manager software sets up and tears down calls between phones, integrating traditional PBX functionality with the corporate IP network. Cisco Unified Communications Manager manages the components of the IP telephonysystem—thephones, the access gateways, and the resources necessary for features such as call conferencing and route planning. Cisco Unified Communications Manager also provides:

Firmware for phones

Authentication and encryption (if configured for the telephony system)

Configuration, CTL, and Identity Trust List (ITL) files via the TFTP service

Phone registration

Call preservation, so that a media session continues if signaling is lost between the primary Communications Manager and a phone

For information about configuring Cisco Unified Communications Manager to work with the IP devices described in this chapter, refer to Cisco Unified Communications Manager Administration Guide,Cisco Unified Communications Manager System Guide, andCisco Unified Communications Manager Security Guide.

For an overview of security functionality for the Cisco Unified IP Phone, see Understanding Security Features for Cisco Unified IP Phones, page 1-13.

Note If the Cisco Unified IP Phone model that you want to configure does not appear in the Phone Typedrop-downlist in Cisco Unified Communications Manager Administration, go to the following URL and install the latest support patch for your version of Cisco Unified Communications Manager:

http://www.cisco.com/kobayashi/sw-center/sw-voice.shtml

Related Topic

Telephony Features Available for the Phone, page 5-1

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

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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-IPtraffic

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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