Cisco Systems OL-8148-01 User Manual

CHAPTER

Preparing to Install the Cisco Unified IP Phone on Your Network

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

This chapter focuses on the interactions between the Cisco Unif ied IP Phone 7970 Series and Cisco Unified CallManager, DNS and DHCP servers, TFTP servers, and switches. It also describes options for powering ph ones.

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

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

This chapter provides an overview of the interaction between the Cisco Unified IP Phone 7970 Series 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 2-8

• Understanding the Phone Startup Process, page 2-9

• Adding Phones to the Cisco Unified CallManager Database, page 2-11

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Understanding Interactions with Other Cisco Unified IP Communications Products

• Using Cisco Unified IP Phones with Different Protocols, page 2-16

• Determining the MAC Address of a Cisco Unified IP Phone, page 2-18

Understanding Interactions with Other Cisco Unified IPCommunications 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. Y ou must also register the Cisco Unified IP Phone with a Cisco Unified CallManager system before sending and receiving calls.

This section includes these topics:

• Understanding How the Cisco Unified IP Phone Interacts with Cisco

Unified CallManager, 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 CallManager

Cisco Unified Call Manager is an op en and industry-standard call processing system. Cisco Unified CallManager software sets up and tears down calls between phones, integrating traditional PBX functionality with the corporate IP network. Cisco Unified CallManager manages the com ponents of t he IP telephony system—the phones, the access gateways, and the resources necessary for such features as call conferencing and route planning. Cisco Unified CallManager also provides:

• Firmware for phones

• Authentication and encryption (if configured for the telephony system)

• Configuration file and CTL file, via TFTP service

• Phone registration

• Call preservation, so that a media session continues if signaling is lost

between the primary CallManager an d a phone)

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Understanding Interactions with Other Cisco Unified IP Communications Products

For information about configuring Cisco Unified CallManager to work with the IP devices described in this chapter, refer to Cisco Unified CallManager

Administration Guide, Cisco Unified CallManager System Guide , and to Cisco Unified CallManager 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 CallManager Administration, go to the following URL and install the latest support patch for your version of Cisco U nified CallManager:

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

Understanding How the Cisco Unified IP Phone Interacts with the VLAN

The Cisco U nified IP Phone 7970 Series 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 traff ic from

the VLAN data traffic.

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Providing Power to the Phone

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:

• V oice traf fic to and from the IP phone (auxiliary VLAN, on the Cisco Catalyst

• Data traffic to and from the PC connected to the switch through the access

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://www.cisco.com/univercd/cc/td/doc/product/lan/index.htm

Power Guidelines

Table 2-1 provides guidelines that apply to external power and to PoE power for

phones the Cisco Unified IP Phone 7970 Series.

Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 7970 Series

Power Type Guidelines

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

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

• The Cisco Unified IP Phone 7970G and 7971G-GE use the

CP-PWR-CUBE-3 power supply.

• The inline power patch panel WS-PWR-PANEL is not compatible

with the Cisco Unified IP Phone.

• 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 t o the documentation for your switch for operating system version information.

Providing Power to the Phone

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 Table 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.

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Providing Power to the Phone

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

Phone Model Powe r Configuration

Cisco Unified IP Phone 7970G

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

Max. Power Consumed from a Switch

6.3 W Approx. 1/2

Phone Screen Brightness

supports 7 W or 15.4 W power per port, without bidirectional power negotiation

IEEE 802.3af Class 3 power from a Cisco switch,

6.3 W Approx. 1/2

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

10.25 W Full

bidirectional power negotiation enabled Cisco prestandard PoE from a Cisco Switch that

10.25 W Full supports 15.4 W power per port, with bidirectional power negotiation enabled

External power — Full

Cisco Unified IP Phone 7971G-GE

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

15.4 W Near full

External power — Full

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

2-6

Note When a phone is powered with a method that does not suppo rt full brightness for

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

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