Cisco Unified Wireless IP Phone 7921G Administration Guide Release 7.0
Overview of the Cisco Unified Wireless IP Phone 7921G
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Overview of the Cisco Unified Wireless IP Phone 7921G

Table Of Contents

Overview of the Cisco Unified Wireless IP Phone 7921G

Understanding the Cisco Unified Wireless IP Phone 7921G

Features Supported on the Cisco Unified Wireless IP Phone 7921G

Feature Overview

Configuring Telephony Features

Configuring Network Access for the Phone

Providing Users with Feature Information

Understanding Security Features for Cisco Unified IP Phones

Overview of Supported Security Features

Understanding Security Profiles

Identifying Encrypted and Authenticated Phone Calls

Security Restrictions

Overview of Configuring and Installing the Cisco Unified Wireless IP Phone 7921G

Configuring the Cisco Unified Wireless IP Phone 7921G in Cisco Unified Communications Manager

Installing the Cisco Unified Wireless IP Phone 7921G


Overview of the Cisco Unified Wireless IP Phone 7921G


This chapter includes the following sections:

Understanding the Cisco Unified Wireless IP Phone 7921G

Features Supported on the Cisco Unified Wireless IP Phone 7921G

Understanding Security Features for Cisco Unified IP Phones

Overview of Configuring and Installing the Cisco Unified Wireless IP Phone 7921G


Note For healthcare environments, be aware that this product is not a medical device and uses an unlicensed frequency band that is susceptible to interference from other devices or equipment.


Understanding the Cisco Unified Wireless IP Phone 7921G

The Cisco Unified Wireless IP Phone 7921G provides wireless voice communication over an IP network. Like traditional analog telephones, you can place and receive phone calls and access features such as hold, transfer, and speed dial. In addition, because the phone connects to your wireless local area network (WLAN), you can place and receive phone calls from anywhere in your wireless environment.

The Cisco Unified Wireless IP Phone 7921G is an 802.11 dual band wireless device that provides comprehensive voice communications in conjunction with Cisco Unified Communications Manager and Cisco Aironet 802.11b/g and Cisco Aironet 802.11a Access Points (APs) in a private business communications network. This phone model, like other network devices, must be configured and managed. This phone encodes G.711a, G.711u, G.729a, G.729ab, G.722/iLBC, and decodes G.711a, G711b, G.711u, G.729, G729a, G729b, and G729ab. The phone also supports uncompressed wideband (16 bits, 16 kHz) audio.

The wireless IP phone supports multiple lines and most of the IP phone features of other Cisco Unified IP Phones.

Figure 1-1 shows the Cisco Unified Wireless IP Phone 7921G. The table that follows describes the functions of the keys on the phone.

Figure 1-1 Cisco Unified Wireless IP Phone 7921G Buttons and Keys

1

Indicator light (LED)

Provides these indications:

Solid red—Phone is connected to AC power source and battery is charging.

Solid green—Phone is connected to AC power source and battery is fully charged.

Fast blinking red—Incoming call. (Phone can be charging or fully charged.)

Slow blinking red—Voice message. (When connected to AC power source, red light displays longer than when phone is using only the battery.)

Slow blinking green—Phone is using only battery power. Phone is registered with the wireless network and is within service coverage area.

2

Headset port

Port for plugging in a headset or ear bud.

3

Speaker button

Toggles the speaker mode on or off for the phone.

4

Right softkey button

Activates the Options menu for access to the list of softkeys. Sometimes displays a softkey label.

5

Navigation button

Accesses these menus and lists from the main screen:

 

Directory

Line View

Settings

Services

 

Allows you to scroll up and down menus to highlight options and to move left and right through phone numbers and text entries.

6

Select button

Activates the Help menu from the main screen.

Allows you to select a menu item, a softkey, a call, or an action.

7

Power/End button (red)

Turns the phone on or off, silences a ringing call, or ends a connected call.

When using menus, acts as a shortcut to return to the main screen.

8

Pound (#) key

Toggles between locking and unlocking the keypad.

Allows you to enter these special characters when you are entering text:
# ? ( ) [ ] { }

9

Zero (0) key

Enters "0" when dialing a number. Allows you to enter a space or these special characters when you are entering text:
, . ` " | _ ~ '

10

Asterisk (*) key

Toggles between Ring and Vibrate mode.

Allows you to enter these special characters when you are entering text:
* + - / = \ : ;

11

Keypad

Allows you to dial numbers, enter letters, and choose menu items by number.

Press and hold key 1 to access your voice messaging system.

12

One (1) key

Enters "1" when dialing a number. Allows you to access the voice messaging system.

Allows you to enter these special characters when you are entering text:
! @ < > $ % ^ &

13

Answer/Send button (green)

Allows you to answer a ringing call or, after dialing a number, to place the call.

14

Left softkey button

Activates the softkey option displayed on the screen. When customized by the phone administrator or user, allows direct access to the Phone Book or voice messages.

15

Mute button

Toggles the mute feature on or off.

16

Volume button

When the phone is idle, allows you to control the ring volume, turn on the vibrate option, or turn off the ring.

When an incoming call is ringing, allows you to press this button once to silence the ring for the call.

During a call, allows you to control the speaker volume for the handset, headset, and speaker mode.

17

Application button

Configurable button that is used with XML applications, such as Push to Talk or Directory services. See "Setting Up Services" section.


For more information about phone features and how they operate, refer to the Cisco Unified Wireless IP Phone 7921G Phone Guide and Quick Reference for Cisco Unified Communications Manager 4.3, 5.1, 6.0 and Later and Cisco Unified IP Phone Features A - Z on this index:

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

Related Topics

Features Supported on the Cisco Unified Wireless IP Phone 7921G

Overview of Configuring and Installing the Cisco Unified Wireless IP Phone 7921G

Features Supported on the Cisco Unified Wireless IP Phone 7921G

The Cisco Unified Wireless IP Phone 7921G functions much like traditional IP phones allowing you to place and receive telephone calls while connected to the wireless LAN. In addition to traditional phone features, the Cisco Unified Wireless IP Phone includes features that enable you to administer and monitor the phone as a network device.


Caution This product is not a medical device and may use an unlicensed frequency band that is susceptible to interference from other devices or equipment.

This section provides information about these topics:

Feature Overview

Configuring Telephony Features

Related Topics

Configuring Network Access for the Phone

Providing Users with Feature Information

Feature Overview

The Cisco Unified Wireless IP Phone 7921G provides traditional telephony functionality, such as call forwarding and transferring, call pickup, redialing, speed dialing, conference calling, and voice messaging system access, as well as these features:

Wireless web access to your phone number and the corporate directory.

Access to network data, XML applications, and web-based services.

Online customizing of phone features and services from the User Options web pages.

An online help system that displays information on the phone screen.

BLF enhancements, DND-Reject, Calling Party Normalization, and E.164 dialing with plus sign (+).

CSV file support, directed call pickup, Single Button Barge, Join Across Lines enhancement, and intercom with extension mobility.

Related Topics

Configuring Network Profiles

Configuring Features, Templates, Services, and Users

Configuring Telephony Features

You can use Cisco Unified Communications Manager Administration application to set up phone registration criteria and calling search spaces, to configure corporate directories and services, and to modify phone button templates. See the "Telephony Features Available for the Phone" section and Cisco Unified Communications Manager Administration Guide for additional information.

For more information about Cisco Unified Communications Manager Administration, refer to Cisco Unified Communications Manager documentation, including Cisco Unified Communications Manager System Guide. You can also use the context-sensitive help available within the application.

You can access the complete Cisco Unified Communications Manager documentation suite at this location:

http://www.cisco.com/en/US/products/sw/voicesw/ps556/tsd_products_support_series_home.html

Related Topics

Understanding Security Features for Cisco Unified IP Phones

Security for Voice Communications in WLANs

Interacting with Cisco Unified Communications Manager

Telephony Features Available for the Phone

Configuring Network Access for the Phone

Like other network devices, you must configure IP phones to access Cisco Unified Communications Manager and the rest of the IP network using the wireless LAN. There are two methods for configuring network settings such as DHCP, TFTP, and for wireless settings for the phone.

Cisco Unified Wireless IP Phone 7921G web pages

Network Profiles menu on the Cisco Unified Wireless IP Phone 7921G

You can access the configuration web pages by using a browser from your PC. For more information, see Using the Cisco Unified Wireless IP Phone 7921G Web Pages.

You can also configure network settings on the phone itself. For more information about configuring features from the phone, see Chapter 5 "Configuring Settings on the Cisco Unified Wireless IP Phone."

Because the Cisco Unified Wireless IP Phone is a network device, you can obtain detailed status information about it. This information can assist you in troubleshooting problems that users might encounter when using their IP phones. See Chapter 9 "Monitoring the Cisco Unified Wireless IP Phone Remotely," for tips on using this information.

Related Topics

Using the Cisco Unified Wireless IP Phone 7921G Web Pages

Configuring Settings on the Cisco Unified Wireless IP Phone

Monitoring the Cisco Unified Wireless IP Phone Remotely

Providing Users with Feature Information

If you are a system administrator, you are the primary source of information for Cisco Unified Wireless IP Phone users in your network or company. To ensure that you distribute the most current feature and procedural information, familiarize yourself with Cisco Unified Wireless IP Phone 7921G documentation. Make sure to visit the Cisco Unified IP Phone web site:

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

From this site, you can view additional phone documentation.

In addition to providing documentation, it is important to inform users about available Cisco Unified IP Phone features—including features specific to your company or network—and about how to access and customize those features, if appropriate.

For a summary of the key information that you can provide to phone users, see "Providing Information to Users By Using a Website."


Note The radio frequency (RF) for the Cisco Unified Wireless IP Phone 7921G is configured for a specific regulatory domain. If users attempt to use this phone outside of the regulatory domain, the phone will not function properly and they might violate local regulations.


Related Topic

Providing Information to Users By Using a Website

Understanding Security Features for Cisco Unified IP Phones

Implementing security in the Cisco Unified Communications Manager system prevents identity theft and prevents data, call signaling, and media stream tampering. To reduce or eliminate threats, the Cisco IP telephony network establishes and maintains authenticated and encrypted communication streams between a phone and the Cisco Unified Communications Manager server, digitally signs files before transferring the files to a phone, and encrypts media streams and call signaling between Cisco Unified IP phones. Table 1-1 contains additional information about security.

Table 1-1 Cisco Unified IP Phone and Cisco Unified Communications Manager
Security Topics 

Topic
Reference

Detailed explanation of security, including set up, configuration, and troubleshooting information for Cisco Unified Communications Manager and Cisco Unified IP Phones

Refer to Cisco Unified Communications Manager Security Guide

Security features supported on the Cisco Unified IP Phone

See the "Overview of Supported Security Features" section

Restrictions regarding security features

See the "Security Restrictions" section

Viewing a security profile name when running Cisco Unified Communications Manager 5.0 or later

See the "Understanding Security Profiles" section

Identifying phone calls for which security is implemented

See the "Identifying Encrypted and Authenticated Phone Calls" section

Transport Layer Security (TLS) connection

See the "Networking Protocols Used with Cisco Unified Wireless IP Phones" section

See the "Phone Configuration Files and Profile Files" section

Security and the phone startup process

See the "Understanding the Phone Startup Process" section

Security and phone configuration files

See the "Phone Configuration Files and Profile Files" section

Changing the TFTP Server 1 or TFTP Server 2 option on the phone when security is implemented

See the "Configuring Network Profiles" section

Items on the Security Configuration menu on the phone

See the "Viewing Security Information" section

Unlocking the CTL file

See the "Accessing the CTL File Screen" section

Disabling access to phone web pages

See the "Product-Specific Configuration Options for the Cisco Unified Wireless IP Phone 7921G" section

Troubleshooting

See the "General Troubleshooting Information" section

Refer to Cisco Unified Communications Manager Security Guide, Troubleshooting chapter

Resetting or restoring the phone

See the "Erasing the Local Configuration" section


For information about supported security options for the Cisco Unified Wireless IP Phone 7921G, see the "Authentication Methods" section.

Overview of Supported Security Features

Table 1-2 provides an overview of the security features that the Cisco Unified Wireless IP Phone 7921G supports. For more information about these features and about Cisco Unified Communications Manager and Cisco Unified IP Phone security, refer to Cisco Unified Communications Manager Security Guide.

For information about current security settings on a phone, choose SETTINGS > System Configuration > Security Configuration. For more information, see the "Viewing Security Information" section.


Note Most security features are available only if a certificate trust list (CTL) is installed on the phone. For more information about the CTL, refer to "Configuring the Cisco CTL Client" chapter in the Cisco Unified Communications Manager Security Guide.


Table 1-2 Overview of Security Features 

Feature
Description

Image authentication

Prevents tampering with the firmware image before it is loaded on a phone by using signed binary files (with the extension.sbn). Tampering with the image causes a phone to fail the authentication process and reject the new image.

Customer-site certificate installation

Authenticates each Cisco Unified IP Phone by using a unique certificate. Phones include a manufacturing installed certificate (MIC), but for additional security, you can specify in Cisco Unified Communications Manager Administration that a certificate be installed by using the Certificate Authority Proxy Function (CAPF). Alternatively, you can install a locally significant certificate (LSC) from the Security Configuration menu on the phone. See the "Configuring the Security Certificate on the Phone" section for more information.

Device authentication

Occurs between the Cisco Unified Communications Manager server and the phone when each entity accepts the certificate of the other entity. Determines whether a secure connection between the phone and a Cisco Unified Communications Manager should occur, and, if necessary, creates a secure signaling path between the entities using TLS protocol. Cisco Unified Communications Manager will not register phones unless authenticated by the Cisco Unified Communications Manager.

Cisco Unified IP Phone 7921G supports only the Secure Hash Algorithm-1 (SHA-1) signature algorithm.

File authentication

Validates digitally-signed files that the phone downloads. The phone validates the signature to make sure that file tampering did not occur after the file creation. Files that fail authentication are not written to Flash memory on the phone. The phone rejects such files without further processing.

Signaling Authentication

Uses the TLS protocol to validate that no tampering has occurred to signaling packets during transmission.

Manufacturing installed certificate

Each Cisco Unified IP Phone contains a unique manufacturing installed certificate (MIC), which is used for device authentication. The MIC is a permanent unique proof of identity for the phone, and allows Cisco Unified Communications Manager to authenticate the phone.

Secure SRST reference

After you configure a SRST reference for security and then reset the dependent devices in Cisco Unified Communications Manager Administration, the TFTP server adds the SRST certificate to the phone cnf.xml file and sends the file to the phone. A secure phone then uses a TLS connection to interact with the SRST-enabled router.

Media encryption

Uses SRTP to ensure that the media streams between supported devices proves secure and that only the intended device receives and reads the data. Includes creating a media master key pair for the devices, delivering the keys to the devices, and securing the delivery of the keys while the keys are in transport.

Signaling encryption

Ensures that all SCCP signaling messages that are sent between the device and the Cisco Unified Communications Manager server are encrypted.

CAPF (Certificate Authority Proxy Function)

Implements parts of the certificate generation procedure that are too processing-intensive for the phone, and it interacts with the phone for key generation and certificate installation. The CAPF can be configured to request certificates from customer-specified certificate authorities on behalf of the phone, or it can be configured to generate certificates locally.

Security profiles

Defines whether the phone is non-secure, authenticated, or encrypted. See the "Understanding Security Profiles" section for more information.

Encrypted configuration files

Lets you ensure the privacy of phone configuration files.

Optional disabling of the web server functionality for a phone

You can prevent access to a phone's web page, which displays a variety of operational statistics for the phone.

Phone hardening

Additional security options, which you control from Cisco Unified Communications Manager Administration:

Disabling Gratuitous ARP (GARP)

Disabling access to the Setting menus

Disabling access to web pages for a phone

Note You can view current settings for the GARP Enabled, and Web Access options by looking at the phone's Device Information menu. For more information, see the "Viewing Security Information" section.


Related Topics

Understanding Security Profiles

Identifying Encrypted and Authenticated Phone Calls

Viewing Device Information

Security Restrictions

Understanding Security Profiles

A security profile defines whether a phone is non-secure, authenticated, or encrypted and associated with every Cisco Unified IP Phone that is supported by Cisco Unified Communications Manager Administration. For information about configuring the security profile and applying the profile to the phone, refer to Cisco Unified Communications Manager Security Guide.


Note Security is configured on each Cisco Unified IP Phone. For more information about configuring security, refer to Cisco Unified CallManager Security Guide at http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_maintenance_guides_list.html.


To view the security mode that is set for the phone, from the phone screen, choose SETTINGS > Device Information > Security > Security Mode. For more information, see the "Viewing Security Information" section.

Related Topics

Identifying Encrypted and Authenticated Phone Calls

Viewing Device Information

Security Restrictions

Identifying Encrypted and Authenticated Phone Calls

When security is implemented for a phone, you can identify authenticated or encrypted phone calls by icons on the screen on the phone.

In an authenticated call, all devices participating in the establishment of the call are authenticated by the Cisco Unified Communications Manager. When a call in progress is authenticated, the call progress icon to the right of the call duration timer in the phone screen changes to this icon:

In an encrypted call, all devices participating in the establishment of the call are authenticated by the Cisco Unified Communications Manager. In addition, call signaling and media streams are encrypted. An encrypted call offers the highest level of security, providing integrity and privacy to the call. When a call in progress is being encrypted, the call progress icon to the right of the call duration timer in the phone screen changes to this icon:


Note If the call is routed through non-IP call legs, such as the PSTN, the call might be non-secure even though it is encrypted within the IP network and has a lock icon associated with it.


Related Topics

Understanding Security Features for Cisco Unified IP Phones

Understanding Security Profiles

Security Restrictions

Security Restrictions

When using a phone that is not configured for encryption, the user cannot barge into an encrypted call. When barge fails in this case, a reorder tone (fast busy tone) plays on the barge initiator's phone.

If the phone is configured for encryption, the user can barge into an authenticated or non-secure call from the encrypted phone. After the barge occurs, Cisco Unified Communications Manager classifies the call as non-secure.

If the phone is configured for encryption, the user can barge into an encrypted call, and the phone indicates that the call is encrypted.

A user can barge into an authenticated call, even if the phone that is used to barge is non-secure. The authentication icon continues to display on the authenticated phones in the call, even if the initiator's phone does not support security.

Overview of Configuring and Installing the Cisco Unified Wireless IP Phone 7921G

When deploying a new IP telephony system, system administrators and network administrators must complete several initial configuration tasks to prepare the network for IP telephony service. For information and a checklist for setting up and configuring a complete Cisco IP telephony network, refer to the "System Configuration Overview" chapter in the Cisco Unified Communications Manager System Guide.

To add wireless IP phones to the IP network, system administrators also must perform a site survey to determine where to place and install access points (APs) for wireless voice coverage. For detailed information about a voice over WLAN deployment, refer to the Cisco Enterprise Mobility 3.0 Design Guide.

After you have set up the IP telephony system and configured system-wide features in Cisco Unified Communications Manager, you can add IP phones to the system.

The following topics provide an overview of procedures for adding Cisco Unified IP Phones to your network:

Configuring the Cisco Unified Wireless IP Phone 7921G in Cisco Unified Communications Manager

Installing the Cisco Unified Wireless IP Phone 7921G

Configuring the Cisco Unified Wireless IP Phone 7921G in Cisco Unified Communications Manager

To add phones to the Cisco Unified Communications Manager database, you can use:

Auto-registration

Cisco Unified Communications Manager Administration

Bulk Administration Tool (BAT)

BAT and the Tool for Auto-Registered Phones Support (TAPS)

For more information about these choices, see the "Methods for Adding Phones to Cisco Unified Communications Manager" section.

For general information about configuring phones in Cisco Unified Communications Manager, refer to the "Cisco Unified IP Phone" chapter in the Cisco Unified Communications Manager System Guide.

For a checklist of tasks for configuring the phone in Cisco Unified Communications Manager, see the "Configuring the Cisco Unified Wireless IP Phone 7921G in Cisco Unified Communications Manager" section.

Related Topics

Installing the Cisco Unified Wireless IP Phone 7921G

Configuring Features, Templates, Services, and Users

Configuring the Cisco Unified Wireless IP Phone 7921G in Cisco Unified Communications Manager

Installing the Cisco Unified Wireless IP Phone 7921G

After you have added the phones to the Cisco Unified Communications Manager database, you can complete the phone installation. You (or the phone users) can install the phone at the users's location. The Cisco Unified Wireless IP Phone Installation Guide that ships in the box with each phone provides directions for assembling the phone and accessories and charging the battery.

Prior to using the phone to connect to the wireless LAN, you need to configure a network profile for the phone. You can use the Cisco Unified Wireless IP  Phone 7921G web pages to set up the network profile and other phone settings, or you can configure the network profile using phone menus.

If you use auto-registration with Cisco Unified Communications Manager, you need to update the specific configuration information for the phone such as associating the phone with a user, changing the softkey template, or directory number.


Note Before you install a phone, even if it is new, upgrade the phone to the current firmware image. For information about upgrading, refer to the Readme file for your phone which is located at: http://www.cisco.com/cgi-bin/tablebuild.pl/ip-7900ser-crypto


For a checklist of tasks for installing the phone, see the "Installing the Cisco Unified Wireless IP Phone 7921G" section.

Related Topics

Understanding the Cisco Unified Wireless IP Phone 7921G

Configuring the Cisco Unified Wireless IP Phone 7921G in Cisco Unified Communications Manager

Installing the Cisco Unified Wireless IP Phone 7921G

Troubleshooting the Cisco Unified Wireless IP Phone 7921G