Cisco Systems OL-23089-01 User Manual

CHAP T E R

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 phones depend upon and interact with several other key Cisco IP Telephony and network components, including Cisco Unified CM, Domain Name System (DNS) and DHCP servers, TFTP servers, media resources, and Cisco prestandard PoE.

This chapter focuses on the interactions between the Cisco Unified IP Phone 7931G and Cisco Unified CM, 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 (you must be a registered Cisco.com user):

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

This chapter includes these topics:

• Understanding Interactions with Other Cisco Unified IP Communications Products, page 2-1

• Providing Power to the Phone, page 2-3

• Understanding Phone Configuration Files, page 2-5

• Understanding the Phone Startup Process, page 2-6

• Adding Phones to Cisco Unified CM, page 2-7

• Using Cisco Unified IP Phones with Different Protocols, page 2-10

• Determining the MAC Address of a Cisco Unified IP Phone, page 2-12

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 CM system before sending and receiving calls.

This section includes these topics:

• Understanding How the Cisco Unified IP Phone Interacts with Cisco Unified CM, page 2-2

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

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Understanding Interactions with Other Cisco Unified IP Communications Products

Understanding How the Cisco Unified IP Phone Interacts with Cisco Unified CM

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

For an overview of security functionality for the Cisco Unified IP Phone, see the “Understanding

Security Features for Cisco Unified IP Phones” section on page 1-11.

Note If the Cisco Unified IP Phone model that you want to configure does not appear in the Phone Type

drop-down list in Cisco Unified CM Administration, go to the following URL and install the latest support patch for your version of Cisco Unified CM:

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

Understanding How the Cisco Unified IP Phone Interacts with the VLAN

The Cisco Unified IP Phone 7931G has 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 the same switch port. This shared physical link has these implications for the network VLAN configuration:

• Although the current VLANs may 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 VoIP 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)

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• 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

Providing Power to the Phone

The Cisco Unified IP Phones 7931G can be powered with external power or with Power over Ethernet (PoE). External power is provided through a separate power supply. PoE is provided by a switch through the Ethernet cable attached to a phone.

• Power Outage, page 2-3

Providing Power to the Phone

Power Outage

• Power Guidelines, page 2-4

• Obtaining Additional Information about Power, page 2-4

Your accessibility to emergency service through the phone is dependent on the phone being powered. If there is an interruption in the power supply, Service and Emergency Calling Service dialing will not function until power is restored. In the case of a power failure or disruption, you may need to reset or reconfigure equipment before using the Service or Emergency Calling Service dialing.

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Providing Power to the Phone

Power Guidelines

Table 2-1 provides guidelines that apply to external power and to PoE power for the Cisco Unified IP

Phones 7931G.

Table 2-1 Guidelines for Powering the Cisco Unified IP Phones 7931G

Power Type Guidelines

External power— Provided through a Cisco external power supply.

External power—Provided through the Cisco Unified IP Phone Power Injector.

PoE power—Provided by a switch through the Ethernet cable attached to the phone.

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

The CP-PWR-CUBE-3 external power supply may be used with the Cisco Unified IP Phones 7931G.

The Cisco Unified IP Phone Power Injector may be used with any Cisco Unified IP Phone. Functioning as a midspan device, the injector delivers inline power to the attached phone. The Cisco Unified IP Phone Power Injector is connected between a switch port and the IP Phone, and supports a maximum cable length of 100m between the unpowered switch and the phone.

• The Cisco Unified IP Phones 7931G supports IEEE 802.3af Power

over Ethernet.

• To ensure uninterruptible operation of the phone, make sure that the

switch has a backup power supply.

• Make sure that the CatOS or IOS version running on your switch

supports your intended phone deployment. Refer to the documentation for your switch for operating system version information.

Obtaining Additional Information about Power

For related information about power, refer to these documents:

• Cisco Catalyst Switches—Cisco switches that work with the Cisco Unified IP Phones:

http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.htm l

• Cisco IOS Software—Cisco IOS releases that support bidirectional power negotiation:

http://www.cisco.com/en/US/products/sw/iosswrel/products_ios_cisco_ios_software_category_ho me.html

• Other requirements and restrictions regarding power:

–

Cisco Unified IP Phone Power Injector Installation Guide

–

Power Over Ethernet Solutions—Introduction

–

Integrated Service Routers:

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

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