Cisco Systems OL-8555-01 User Manual

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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 Cisco Unified IP Phones depend upon and interact with several other key Cisco Unified IP Telephony and network components.

This chapter focuses on the interactions between the Cisco Unified IP Phone 7960G and 7940G and Cisco Unified CallManager, DNS and DHCP servers, TFTP servers, and switches. It also describes options for powering phones. For related information about other major components in a Voice over IP (VoIP) network, refer to Cisco IP Telephony Solution Reference Network Design (SRND) for Cisco Unified CallManager 4.0, which is available at this URL:

http://www.cisco.com/go/srnd

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 7960G and 7940G and other key components of the Voice over IP (VoIP) network and includes these topics:

• Understanding Interactions with Other Cisco Unified IP Telephony Products,

page 2-2

• Providing Power to the Cisco Unified IP Phone, page 2-4

• Understanding Phone Configuration Files, page 2-6

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Understanding the Phone Startup Process

• Understanding the Phone Startup Process, page 2-7

• Methods for Adding Phones to the Cisco Unified CallManager Database,

page 2-10

• Determining the MAC Address of a Cisco Unified IP Phone, page 2-14

Understanding Interactions with Other Cisco Unified IP Telephony 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 CallManager system before sending and receiving calls.

This section covers the following 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 CallManager is an open and industry-standard call processing system. Cisco Unified CallManager software runs on a Windows 2000 server and sets up and tears down calls between phones, integrating traditional PBX functionality with the corporate IP network. Cisco Unified CallManager manages the components of the 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

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• Phone registration

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

between the primary CallManager and a phone)

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 for the Cisco Unified IP Phone, see the

“Understanding Security Features for Cisco Unified IP Phones” section on page 1-12.

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 Unified CallManager:

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 7960G and 7940G 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.

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Understanding the Phone Startup Process

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

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Providing Power to the Cisco Unified IP Phone

You can power a Cisco Unified IP Phone from an external power supply, from a switch port, or from a power source between the phone and the switch.

The Cisco Unified IP Phone can be powered by the following sources:

• External power source—Optional Cisco AC adapter and power cord for

connecting to a standard wall receptacle.

• WS-X6348-RJ45V 10/100 switching module—Inline power provider to the

Cisco Unified IP Phone when connected to a Catalyst 6000 family 10/100BaseTX switching module.

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This module sends power on pins 1 & 2 and 3 & 6, which are also used to transmit Ethernet signals. Before the switch sends power, it tests for the presence of a Cisco Unified IP Phone, avoiding damage to other Ethernet devices.

Note Only the network port supports inline power from the

Cisco Catalyst switches.

• WS-PWR-PANEL—Power patch panel that allows the

Cisco Unified IP Phone to be connected to existing Catalyst 4000, 5000, and 6000 family 10/100BaseTX switching modules.

This module sends power on pins 4, 5, 7, & 8, which are not used for Ethernet signaling. Like the inline power, the power patch panel also attempts to verify that the attached device is a Cisco Unified IP Phone before providing power.

Power Outage

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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.