Cisco Unified IP Phone 7970 Series Administration Guide for Cisco Unified CallManager, Release 4.2(3) (for models 7970G and 7971G-GE) - Preparing to Install the Cisco Unified IP Phone on Your Network [Cisco Unified IP Phones 7900 Series]

Table Of Contents

Preparing to Install the Cisco Unified IP Phone on Your Network

Understanding Interactions with Other Cisco Unified IP Telephony Products

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

Understanding How the Cisco Unified IP Phone Interacts with the VLAN

Providing Power to the Phone

Power Guidelines

Phone Power Consumption and Display Brightness

Power Outage

Obtaining Additional Information about Power

Understanding Phone Configuration Files

Understanding the Phone Startup Process

Adding Phones to the Cisco Unified CallManager Database

Adding Phones with Auto-Registration

Adding Phones with Auto-Registration and TAPS

Adding Phones with Cisco Unified CallManager Administration

Adding Phones with BAT

Determining the MAC Address of a Cisco Unified IP Phone

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 CallManager, 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 Phone 7970 Series 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 7970 Series and other key components of the Voice over IP (VoIP) network. It includes these topics:

•Understanding Interactions with Other Cisco Unified IP Telephony Products

•Providing Power to the Phone

•Understanding Phone Configuration Files

•Understanding the Phone Startup Process

•Adding Phones to the Cisco Unified CallManager Database

•Determining the MAC Address of a Cisco Unified IP Phone

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 includes these topics:

•Understanding How the Cisco Unified IP Phone Interacts with Cisco Unified CallManager

•Understanding How the Cisco Unified IP Phone Interacts with the VLAN

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 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

•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 functionality for the Cisco Unified IP Phone, see the "Understanding Security Features for Cisco Unified IP Phones" section.

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/public/sw-center/sw-voice.shtml

Related Topic

•Telephony Features Available for the Phone, page 5-2

Understanding How the Cisco Unified IP Phone Interacts with the VLAN

The Cisco Unified 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 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

Related Topics

•Understanding the Phone Startup Process

•Network Configuration Menu

Providing Power to the Phone

Models in the Cisco Unified IP Phone 7970 Series 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.

These sections provide more information about powering a phone:

•Power Guidelines

•Phone Power Consumption and Display Brightness

•Power Outage

•Obtaining Additional Information about Power

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

The Cisco Unified IP Phone 7970 Series use the CP-PWR-CUBE-3 only.

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

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.

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

•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 to the documentation for your switch for operating system version information.

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.

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) will not allow you to set the brightness to the maximum value.

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

Phone Model

Power Configuration

Max. Power Consumed from a Switch

Phone Screen Brightness

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

6.3 W

Approx. 1/2

Cisco prestandard PoE from a Cisco Switch that supports 7 W or 15.4 W power per port, without bidirectional power negotiation

6.3 W

Approx. 1/2

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

6.3 W

Approx. 1/2

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

10.25 W

Full¹

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

10.25 W

Full

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

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

Power Outage

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.

Obtaining Additional Information about Power

For related information about power, refer to the documents shown in Table 2-3. These documents provide information about these topics:

•Cisco switches that work with the Cisco Unified IP Phone 7970 Series

•The Cisco IOS releases that support bidirectional power negotiation

•Other requirements and restrictions regarding power

Table 2-3 Related Documentation for Power

Document Topics

URL

Cisco Unified IP Phone Power Injector

http://www.cisco.com/en/US/products/hw/phones/ps379/prod_installation_guides_list.html

PoE Solutions

http://www.cisco.com/en/US/netsol/
ns340/ns394/ns147/ns412/networking_solutions_package.html

Cisco Catalyst Switches

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

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_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 CallManager. In general, any time you make a change in Cisco Unified CallManager that requires the phone to be reset, a change is made to the phone's configuration file automatically.

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 CallManager, the phone establishes a TLS connection to Cisco Unified CallManager. Otherwise, the phone establishes a TCP connection.

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.

A phone accesses a default configuration file named XmlDefault.cnf.xml from the TFTP server when these conditions exist:

•You have enabled auto-registration in Cisco Unified CallManager

•The phone has not been added to the Cisco Unified CallManager Database

•The phone is registering for the first time

If auto registration is not enabled and the phone has not been added to the Cisco Unified CallManager Database, the phone registration request will be rejected. In this case, the phone will reset and attempt to register repeatedly.

If the phone has registered before, the phone will access the configuration file named SEPmac_address.cnf.xml, where mac_address is the MAC address of the phone.

Understanding the Phone Startup Process

When connecting to the VoIP network, the Cisco Unified IP Phone goes through a standard startup process, as described in Table 2-4. Depending on your specific network configuration, not all of these process steps may occur on your Cisco Unified IP Phone.

Table 2-4 Cisco Unified IP Phone Startup Process

Process Step

Description

Related Topics

1. Obtaining Power from the Switch

If a phone is not using external power, the switch provides in-line power through the Ethernet cable attached to the phone.

See the "Providing Power to the Phone" section.

See the "Resolving Startup Problems" section.

2. Loading the Stored Phone Image

The Cisco Unified IP Phone has non-volatile Flash memory in which it stores firmware images and user-defined preferences. At startup, the phone runs a bootstrap loader that loads a phone image stored in Flash memory. Using this image, the phone initializes its software and hardware.

See the "Resolving Startup Problems" section.

3. Configuring VLAN

If the Cisco Unified IP Phone is connected to a Cisco switch, the switch next informs the phone of the voice VLAN defined on the switch port. The phone needs to know its VLAN membership before it can proceed with the Dynamic Host Configuration Protocol (DHCP) request for an IP address.

See the "Network Configuration Menu" section.

See the "Resolving Startup Problems" section.

4. Obtaining an IP Address

If the Cisco Unified IP Phone is using DHCP to obtain an IP address, the phone queries the DHCP server to obtain one. If you are not using DHCP in your network, you must assign static IP addresses to each phone locally.

See the "Network Configuration Menu" section.

See the "Resolving Startup Problems" section.

5. Accessing a TFTP Server

In addition to assigning an IP address, the DHCP server directs the Cisco Unified IP Phone to a TFTP Server. If the phone has a statically-defined IP address, you must configure the TFTP server locally on the phone; the phone then contacts the TFTP server directly.

Note You can also assign an alternative TFTP server to use instead of the one assigned by DHCP.

See the "Network Configuration Menu" section.

See the "Resolving Startup Problems" section.

6. Requesting the CTL file

The TFTP server stores the certificate trust list (CTL) file. This file contains a list of Cisco Unified CallManagers and TFTP servers that the phone is authorized to connect to. It also contains the certificates necessary for establishing a secure connection between the phone and Cisco Unified CallManager.

Refer to the Cisco Unified CallManager Security Guide, "Configuring the Cisco CTL Client" chapter.

7. Requesting the Configuration File

The TFTP server has configuration files, which define parameters for connecting to Cisco Unified CallManager and other information for the phone.

See the "Understanding Phone Configuration Files" section.

See the "Resolving Startup Problems" section.

8. Contacting Cisco Unified CallManager

The configuration file defines how the Cisco Unified IP Phone communicates with Cisco Unified CallManager and provides a phone with its load ID. After obtaining the file from the TFTP server, the phone attempts to make a connection to the highest priority Cisco Unified CallManager on the list. If security is implemented, the phone makes a TLS connection. Otherwise, it makes a non-secure TCP connection.

If the phone was manually added to the database, Cisco Unified CallManager identifies the phone. If the phone was not manually added to the database and auto-registration is enabled in Cisco Unified CallManager, the phone attempts to auto-register itself in the Cisco Unified CallManager database.

Note Auto-registration is disabled when security is enabled on Cisco Unified CallManager. In this case, the phone must be manually added to the Cisco Unified CallManager database.

See the "Resolving Startup Problems" section.

Adding Phones to the Cisco Unified CallManager Database

Before installing the Cisco Unified IP Phone, you must choose a method for adding phones to the Cisco Unified CallManager database. These sections describe the methods:

•Adding Phones with Auto-Registration

•Adding Phones with Auto-Registration and TAPS

•Adding Phones with Cisco Unified CallManager Administration

•Adding Phones with BAT

Table 2-5 provides an overview of these methods for adding phones to the Cisco Unified CallManager database.

Table 2-5 Methods for Adding Phones to the Cisco Unified CallManager Database

Method

Requires MAC Address?

Notes

Auto-registration

No

Provides no control over directory number assignment to phone.

Not available when security or encryption is enabled.

Auto-registration with TAPS

No

Requires auto-registration and the Bulk Administration Tool (BAT); updates the Cisco Unified CallManager database with the MAC address and DNs for the device when user calls TAPS from the phone.

Using the Cisco Unified CallManager Administration

Yes

Must add phones individually.

Using BAT

Yes

Can add groups of same model of phone.

Can schedule when phones are added to the Cisco Unified CallManager database.

Adding Phones with Auto-Registration

By enabling auto-registration before you begin installing phones, you can:

•Automatically add a Cisco Unified IP Phone to the Cisco Unified CallManager database when you physically connect the phone to your IP telephony network. During auto-registration, Cisco Unified CallManager assigns the next available sequential directory number to the phone.

•Add phones without first gathering MAC addresses from the phones.

•Quickly enter phones into the Cisco Unified CallManager database and modify any settings, such as the directory numbers, from Cisco Unified CallManager.

•Move auto-registered phones to new locations and assign them to different device pools without affecting their directory numbers.

Note You should use auto-registration to add less than 100 phones to your network. To add more than 100 phones to your network, use the Bulk Administration Tool (BAT). See the "Adding Phones with BAT" section.

In some cases, you might not want to use auto-registration: for example, if you want to assign a specific directory number to the phone or if you plan to implement authentication or encryption, as described in Cisco Unified CallManager Security Guide. For information about enabling auto-registration, refer to "Enabling Auto-Registration" in Cisco Unified CallManager Administration Guide.

Note Cisco Unified CallManager automatically disables auto-registration if you configure the cluster-wide security mode for authentication and encryption through the Cisco CTL client.

Related Topics

•Adding Phones with Auto-Registration and TAPS

•Adding Phones with Cisco Unified CallManager Administration

•Adding Phones with BAT

Adding Phones with Auto-Registration and TAPS

TAPS, the Tool for Auto-Registered Phones Support, works with the Bulk Administration Tool (BAT) to update a batch of phones that were already added to the Cisco Unified CallManager database with dummy MAC addresses. You use TAPS to update MAC addresses and download pre-defined configurations for phones.

You can add phones with auto-registration and TAPS without first gathering MAC addresses from phones.

Note You should use auto-registration and TAPS to add less than 100 phones to your network. To add more than 100 phones to your network, use the Bulk Administration Tool (BAT). See the "Adding Phones with BAT" section.

To implement TAPS, you or the end-user dial a TAPS directory number and follow voice prompts. When the process is complete, the phone will have downloaded its directory number and other settings, and the phone will be updated in Cisco Unified CallManager Administration with the correct MAC address.

Auto-registration must be enabled in Cisco Unified CallManager Administration (System > Cisco Unified CallManager) for TAPS to function.

Note Cisco Unified CallManager automatically disables auto-registration if you configure the cluster-wide security mode for authentication and encryption through the Cisco CTL client.

Refer to Cisco Unified CallManager Bulk Administration Guide for detailed instructions about BAT and about TAPS.

Related Topics

•Adding Phones with Auto-Registration

•Adding Phones with Cisco Unified CallManager Administration

•Adding Phones with BAT

Adding Phones with Cisco Unified CallManager Administration

You can add phones individually to the Cisco Unified CallManager database using Cisco Unified CallManager Administration. To do so, you first need to obtain the MAC address for each phone.

For information about determining a MAC address, see the "Determining the MAC Address of a Cisco Unified IP Phone" section.

After you have collected MAC addresses, choose Device > Add a New Device in Cisco Unified CallManager Administration to begin.

For complete instructions and conceptual information about Cisco Unified CallManager, refer to Cisco Unified CallManager Administration Guide and to Cisco Unified CallManager System Guide.

Related Topics

•Adding Phones with Auto-Registration

•Adding Phones with Auto-Registration and TAPS

•Adding Phones with BAT

Adding Phones with BAT

The Cisco Bulk Administration Tool (BAT) is a plug-in application for Cisco Unified CallManager that enables you to perform batch operations, including registration, on multiple phones.

Before you can add phones using BAT only (not in conjunction with TAPS), you must obtain the MAC address for each phone.

For information about determining a MAC address, see the "Determining the MAC Address of a Cisco Unified IP Phone" section.

For detailed instructions about using BAT, refer to Cisco Unified CallManager Administration Guide and to Cisco Unified CallManager Bulk Administration Guide.

Related Topics

•Adding Phones with Auto-Registration

•Adding Phones with Auto-Registration and TAPS

•Adding Phones with Cisco Unified CallManager Administration

Determining the MAC Address of a Cisco Unified IP Phone

You can determine the MAC address for a phone in any of these ways:

•From the phone, choose Settings > Model Information and look at the MAC Address field.

•Look at the MAC label on the back of the phone.

•Display the web page for the phone and click the Device Information hyperlink.

For information about accessing the web page, see the "Accessing the Web Page for a Phone" section.