Cisco Systems 71 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 by 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 components, including Cisco Unified Communications Manager.

This chapter focuses on the interactions between the Cisco Unified IP Phones 7962G, 7942G, 7961G, 7961G-GE, 7941G, and 7941G-GE 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 the following topics:

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

• Providing Power to the Cisco Unified IP Phone, page 2-3

• Understanding Phone Configuration Files, page 2-5

• Understanding the Phone Startup Process, page 2-7

• Adding Phones to the Cisco Unified Communications Manager Database, page 2-8

• Using Cisco Unified IP Phones with Different Protocols, page 2-11

• Determining the MAC Address for a Cisco Unified IP Phone, page 2-13

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 Communications Manager system before sending and receiving calls.

This section includes the following 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 2-2

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Understanding Interactions with Other Cisco Unified IP Telephony Products

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 file and CTL file, via 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 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 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 7962G, 7942G, 7961G, 7961G-GE, 7941G, and 7941G-GE 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 addresses

might not be available to assign the phone to the same subnet as other devices connected to the same port.

• Data traffic present on the VLAN supporting phones might 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.

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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 increases 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 switch information at this URL:

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

Providing Power to the Cisco Unified IP Phone

The Cisco Unified IP Phones 7962G, 7942G, 7961G, 7961G-GE, 7941G, and 7941G-GE 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

• Power Outage, page 2-4

• Obtaining Additional Information about Power, page 2-5

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Providing Power to the Cisco Unified IP Phone

Power Guidelines

Table 2 -1 provides guidelines for powering the Cisco Unified IP Phones 7962G, 7942G, 7961G,

7961G-GE, 7941G, and 7941G-GE.

Table 2-1 Guidelines for Powering the Cisco Unified IP Phones 7962G, 7942G, 7961G, 7961G-GE, 7941G, and

7941G-GE

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.

External power—Provided through inline power patch panel WS-PWR-PANEL

• The Cisco Unified IP Phones 7962G, 7942G, 7961G, and 7941G use the

CP-PWR-CUBE-3 power supply.

• The Cisco Unified IP Phone 7961G-GE and 7941G-GE use the CP-PWR-CUBE-3

external power supply only.

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 Phones 7962G, 7942G, 7961G, and 7941G support Cisco inline

PoE, but the Cisco Unified IP Phones 7961G-GE, and 7941G-GE do not.

• The Cisco Unified IP Phones 7962G, 7942G, 7961G, 7961G-GE, 7941G, and

7941G-GE support IEEE 802.3af Class 2 power on signal pairs and spare pairs. The Cisco Unified IP Phones 7961G-GE, and 7941G-GE are not compatible with Cisco switches that are not IEEE compliant.

• 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.

The inline power patch panel WS-PWR-PANEL is compatible with the Cisco Unified IP Phones 7962G, 7942G, 7961G, 7961G-GE, 7941G, and 7941G-GE.

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.

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Obtaining Additional Information about Power

For related information about power, refer to the documents shown in Tab le 2-2 . These documents provide information about the following topics:

• Cisco switches that work with the Cisco Unified IP Phones 7962G, 7942G, 7961G, 7961G-GE,

7941G, and 7941G-GE

• The Cisco IOS releases that support bidirectional power negotiation

• Other requirements and restrictions regarding power

Table 2-2 Related Documentation for Power

Document Topics URL

Cisco Unified IP Phone Power Injector

PoE Solutions http://www.cisco.com/en/US/netsol/ns340/ns394/ns147/ns412/net

Cisco Catalyst Switches http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_prod

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

Cisco IOS Software http://www.cisco.com/en/US/products/sw/iosswrel/products_ios_

http://www.cisco.com/en/US/products/ps6951/index.html

working_solutions_package.html

ucts_support_series_home.html

cisco_ios_software_category_home.html

Understanding Phone Configuration Files

Configuration files for a phone are stored on the TFTP server and define parameters for connecting to Cisco Unified Communications Manager. In general, any time you make a change in Cisco Unified Communications Manager that requires the phone to be reset, a change is automatically made to the phone’s configuration file.

Configuration files also contain information about which image load the phone should be running. If this image load differs from the one currently loaded on a phone, the phone contacts the TFTP server to request the required load files. (These files are digitally signed to ensure the authenticity of the files’ source.)

In addition, if the device security mode in the configuration file is set to Authenticated and the CTL file on the phone has a valid certificate for Cisco Unified Communications Manager, the phone establishes a TLS connection to Cisco Unified Communications Manager. Otherwise, the phone establishes a TCP connection. For SIP phones, a TLS connection requires that the transport protocol in the phone configuration file be set to TLS, which corresponds to the transport type in the SIP Security Profile in Cisco Unified Communications Manager Administration.

Note If the device security mode in the configuration file is set to Authenticated or Encrypted, but the phone

has not received a CTL file, the phone will continuously try to obtain a CTL file, so that it can register securely.

If you configure security-related settings in Cisco Unified Communications Manager Administration, the phone configuration file will contain sensitive information. To ensure the privacy of a configuration file, you must configure it for encryption. For detailed information, refer to the “Configuring Encrypted

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