Cisco Systems OL-23092-01 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 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

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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

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-standard call 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 telephony system—the phones, 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, and Cisco 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 Type

drop-down list 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

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

Providing Power to the Phone

Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G 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.

Note When you install a phone that is powered with external power, connect the power supply to the phone

and to a power outlet before you connect the Ethernet cable to the phone. When you remove a phone that is powered with external power, disconnect the Ethernet cable from the phone before you disconnect the power supply.

The following sections provide more information about powering a phone:

• Power Guidelines, page 2-4

• Phone Power Consumption and Display Brightness, page 2-5

• Power Outage, page 2-6

• Obtaining Additional Information about Power, page 2-6

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

Power Guidelines

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

7975G, 7971G-GE, 7970G, 7965G, and 7945G.

Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G

Power Type Guidelines

External power— Provided through the CP-PWR-CUBE-3 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

The Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G use the CP-PWR-CUBE-3 power supply.

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 IP Phone.

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

7945G support IEEE 802.3af Class 3 power on signal pairs and spare pairs.

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

7945G do not support Cisco inline PoE.

• 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.

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

Phone Power Consumption and Display Brightness

The power consumed by a phone depends on its power configuration. See Table 2-1 for a power configuration overview. See Ta b le 2-2 for the maximum power consumed by a phone for each configuration option and the correlating phone screen brightness level.

Note Power consumption values shown in the table include power losses in the cable that connects the phone

to the switch.

Table 2-2 Power Consumption and Display Brightness for Power Configurations

Phone Model Power Configuration

Cisco Unified IP Phone 7975G, 7965G, 7945G

Cisco Unified IP Phone 7971G-GE

Cisco Unified IP Phone 7970G

1. Starts at approximately 1/2 brightness, changes to full brightness when the phone negotiates additional power.

IEEE 802.3af Class 3 power from a Cisco switch, with bidirectional power negotiation enabled

External power — Full

IEEE 802.3af Class 3 power from a Cisco switch (with or without bidirectional power negotiation enabled) or from a third-party switch

External power — Full

Cisco prestandard PoE from a switch that supports a maximum of 7 W power per port, with bidirectional power negotiation enabled

Cisco prestandard PoE from a Cisco Switch that supports 7 W or

15.4 W power per port, without bidirectional power negotiation

IEEE 802.3af Class 3 power from a Cisco switch, without bidirectional power negotiation

IEEE 802.3af Class 3 power from a third-party switch 6.3 W Approx. 1/2

IEEE 802.3af Class 3 power from a Cisco switch, with bidirectional power negotiation enabled

Cisco prestandard PoE from a Cisco Switch that supports 15.4 W power per port, with bidirectional power negotiation enabled

External power — Full

Providing Power to the Phone

Max. Power Consumed from a Switch

Phone Screen Brightness

12 W Full

15.4 W Near full

6.3 W Approx. 1/2

10.25 W Full

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Note When a phone is powered with a method that does not support full brightness for the phone screen, the

phone Brightness control (Settings > User Preferences > Brightness) does not allow you to set the brightness to the maximum value.

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Cisco Systems OL-23092-01 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Understanding Interactions with Other Cisco Unified IP Communications Products

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

Understanding How the Cisco Unified IP Phone Interacts with the VLAN

Providing Power to the Phone

Power Guidelines

Phone Power Consumption and Display Brightness