Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 9.0 (SCCP and SIP)
Cisco Unified IP Phone Installation
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Cisco Unified IP Phone Installation

Cisco Unified IP Phone Installation

Phone Installation Overview

This chapter helps you install the Cisco Unified IP Phone on an IP telephony network.


Before you install a Cisco Unified IP Phone, you must decide how to configure the phone in your network. Then you can install the phone and verify its functionality. For more information, see Cisco Unified IP Phones and Telephony Networks

Before You Begin

Before installing the Cisco Unified IP Phone, review the requirements in these sections.

Network Requirements

For the Cisco Unified IP Phone to successfully operate as a Cisco Unified IP Phone endpoint in your network, your network must meet these requirements:

  • Working VoIP network:

    • VoIP configured on your Cisco routers and gateways

    • Cisco Unified Communications Manager 4.x and later installed in your network and configured to handle call processing

  • IP network that supports DHCP or manual assignment of IP address, gateway, and subnet mask


The Cisco Unified IP Phone displays the date and time from Cisco Unified Communications Manager. The time displayed on the phone can differ from the Cisco Unified Communications Manager time by up to 10 seconds. The Cisco Unified Communications Manager server does not display the local time if it is located in a different time zone than the phones.

Cisco Unified Communications Manager Setup

The Cisco Unified IP Phone requires Cisco Unified Communications Manager to handle call processing. To ensure that Cisco Unified Communications Manager is set up properly to manage the phone and route and process calls, see the Cisco Unified Communications Manager Administration Guide or the context-sensitive help in the Cisco Unified Communications Manager application.

If you plan to use autoregistration, verify that it is enabled and properly configured in Cisco Unified Communications Manager Administration before connecting any Cisco Unified IP Phone to the network. For information about enabling and configuring autoregistration, see the Cisco Unified Communications Manager Administration Guide.

You must use Cisco Unified Communications Manager Administration to configure and assign telephony features to the Cisco Unified IP Phones.

In Cisco Unified Communications Manager Administration, you can add users to the database and associate them with specific phones. In this way, users gain access to Cisco Unified Communications Manager User Option Pages that allow them to configure items such as call forward, speed dial, and voice message system options.

Cisco Unified IP Phone 7931G Components

The Cisco Unified IP Phone 7931G includes these components on the phone or as accessories for the phone.

Network and Access Ports

The back of the Cisco Unified IP Phone includes these ports:

  • Network port: Labeled 10/100 SW

  • Access port: Labeled 10/100 PC

Each port supports 10/100 Mbps half- or full-duplex connections to external devices. You can use either Category 3 or 5 cabling for 10-Mbps connections, but you must use Category 5 for 100 connections.

Use the SW network port to connect the phone to the network. You must use a straight-through cable on this port. The phone can also obtain inline power from a switch over this connection. For details, see Cisco Unified IP Phone Power.

Use the PC access port to connect a network device, such as a computer, to the phone. You must use a straight-through cable on this port.


The handset is designed especially for use with the Cisco Unified IP Phone 7931G. It includes a light strip that indicates incoming calls and voice messages waiting.

To connect a handset to the Cisco Unified IP Phone, plug the cable into the handset and the Handset port on the back of the phone.


The handset does not support wideband audio.


By default, the speakerphone is enabled on the Cisco Unified IP Phone.

Disable Speakerphone

To disable the speakerphone using Cisco Unified CM Administration, perform the following procedure:

    Step 1   Choose Device > Phone and locate the phone you want to modify.
    Step 2   In the Phone Configuration window, check Disable Speakerphone.
    Step 3   Click Apply.


    Although Cisco performs internal testing of third-party headsets for use with the Cisco Unified IP Phones, Cisco does not certify or support products from headset or handset vendors.

    We recommend the use of good-quality external devices; for example, headsets that are screened against unwanted radio frequency (RF) and audio frequency (AF) signals. Depending on the quality of headsets and their proximity to other devices, such as mobile phones and two-way radios, some audio noise or echo can still occur.

    An audible hum or buzz may be heard by the remote party, or the remote party and the Cisco Unified IP Phone user. A range of outside sources such as electric lights, electric motors, or PC monitors can cause humming or buzzing sounds. (In some cases, hum can be reduced or eliminated by using a local power cube or power injector.)


    The Cisco Unified IP Phone 7931G supports wideband headsets.

    These environmental and hardware inconsistencies in the locations where Cisco Unified IP Phones are deployed means that not one single headset solution is optimal for all environments.

    We recommend that customers test headsets in their intended environment to determine performance before making a purchasing decision and deploying en mass.

    Related Information

    Audio Quality

    Beyond physical, mechanical, and technical performance, the audio portion of a headset must sound good to the user and to the party on the far end. Sound quality is subjective and Cisco cannot guarantee the performance of any headsets. However, a variety of headsets from leading headset manufacturers are reported to perform well with Cisco Unified IP Phones.

    For additional information, see the Headsets for Cisco Unified IP Phones and Desktop Clients page on

    Connect Headset

    You can use the headset with all of the features on the Cisco Unified IP Phone, including the Volume and Mute buttons. Use these buttons to adjust the ear piece volume and to mute the speech path from the headset microphone.

    To connect a headset to the Cisco Unified IP Phone,

      Step 1   Plug the headset into the Headset port on the back of the phone.
      Step 2   Press the Headset button on the phone to place and answer calls using the headset.

      Disable Headset

      You can disable the headset by using Cisco Unified Communications Manager Administration.

      To disable the headset, perform the following steps:

        Step 1   Choose Device > Phone and locate the phone you want to modify.
        Step 2   In the Phone Configuration window, check the Disable Speakerphone and Headset check box.
        Step 3   Click Apply.

        External Device Use

        Cisco recommends the use of good quality external devices, such as speakers, microphones, and headsets that are shielded (screened) against unwanted radio frequency (RF) and audio frequency (AF) signals.

        Depending on the quality of these devices and their proximity to other devices, such as mobile phones or two-way radios, some audio noise may still occur. In these cases, Cisco recommends that you take one or more of the following actions:

        • Move the external device away from the source of the RF or AF signals.

        • Route the external device cables away from the source of the RF or AF signals.

        • Use shielded cables for the external device, or use cables with a better shield and connector.

        • Shorten the length of the external device cable.

        • Apply ferrites or other such devices on the cables for the external device.

        Cisco cannot guarantee the performance of the system because Cisco has no control over the quality of external devices, cables, and connectors. The system performs adequately when suitable devices are attached with good quality cables and connectors.


        In European Union countries, use only external headsets that are fully compliant with the EMC Directive [89/336/EC].

        Install Cisco Unified IP Phone

        You must connect the Cisco Unified IP Phone to the network and to a power source before using it. For a graphical representation of the connections, see Cisco Unified IP Phone 7931G Connections.

        Perform the following steps to install a Cisco Unified IP Phone.

          Step 1   Connect the handset to the Handset port.
          Step 2   Connect a headset to the Headset port. You can add a headset later if you do not connect one now.
          Step 3   Connect the power supply to the Cisco DC Adapter port.
          Step 4   Connect a Category 3 or 5 straight-through Ethernet cable from the switch to the 10/100 SW port.

          Each Cisco Unified IP Phone ships with one Ethernet cable in the box.

          Step 5   Connect a Category 3 or 5 straight-through Ethernet cable from another network device, such as a desktop computer, to the 10/100 PC port.

          You can connect another network device later if you do not connect one now.

          Cisco Unified IP Phone 7931G Connections

          The following figure and table show how to connect your phone.


          DC Adaptor port (DC48V)


          Network port (10/100 SW)


          Access port (10/100 PC)


          Headset port


          Handset port

          Phone Cable Lock

          You can secure the Cisco Unified IP Phone to a desktop using a laptop cable lock. The lock connects to the security slot on the back of the phone, and the cable can be secured to a desktop.

          The security slot can accommodate a lock up to 20 mm. Compatible laptop cable locks include the Kensington laptop cable lock and laptop cable locks from other manufacturers that can fit into the security slot on the back of the phone. See the following figure.

          Figure 1. Connecting a Cable Lock to the Cisco Unified IP Phone

          Mount Phone on Wall

          You can mount the Cisco Unified IP Phone on the wall using special brackets that are available in a Cisco Unified IP Phone wall mount kit. Wall mount kits must be ordered separately from the phones.

          You can also attach the phone to the will without a wall mount kit. In either case, you need the following tools and parts:

          • Screwdriver
          • Screws to secure the Cisco Unified IP Phone to the wall (included with the wall mount kit
          Before You Begin

          To ensure that the handset attaches securely to a wall-mounted phone, remove the handset wall hook from the handset rest, rotate the hook 180 degrees, and reinsert the hook. Turning the hook exposes a lip on which the handset catches when the phone is vertical. For an illustrated procedure, refer to Installing the Universal Wall Mount Kit for the Cisco Unified IP Phone at http:/​/​​en/​US/​products/​hw/​phones/​ps379/​prod_​installation_​guides_​list.html.

          To mount the phone on the wall without using the wall mount kit, follow these steps:


          Use care to not damage wires or pipes located inside the wall when securing screws to wall studs.

            Step 1   Remove the footstand if it is attached to the phone.

            To remove the footstand, disengage the footstand tabs from the phone by grasping and gently squeezing the footstand at the top and bottom, near where the stand attaches to the phone.

            Step 2   Insert two screws into a wall stud, matching them to the two screw holes on the back of the phone.

            The holes fit standard phone jack mounts.

            Step 3   Hang the phone on the wall.

            Phone Startup Verification

            After the Cisco Unified IP Phone has power connected to it, the phone begins its startup process by cycling through these steps.

            1. These buttons flash on and off in sequence:

              • Mute
              • Speaker
              • Line 1 (amber)
            2. The phone screen displays the Cisco Systems, Inc., logo screen.

            3. These messages display as the phone starts:

              • Verifying load (if the phone load does not match the load on the TFTP server). If this message displays, the phone start up again and repeats steps 1 and 2 above. The phone also displays the download progress and names of files it downloads and upgrades.
              • Configuring IP.
              • Updating the Trust List.
              • Updating Locale.
              • Configuring CM Unified List.
              • Registering.
            4. The main phone screen displays:

              • Current date and time
              • Primary directory number
              • Additional directory numbers and speed dial numbers, if configured
              • Softkeys

            If the phone successfully passes through these stages, it has started up properly. If the phone does not start up properly, see the Startup Problems.

            Network Settings

            If you are not using DHCP in your network, you must configure these network settings on the Cisco Unified IP Phone after installing the phone on the network:

            • IP address

            • IP subnet information (subnet mask for IPv4 and subnet prefix length for IPv6)

            • Default gateway IP address

            • TFTP server IP address

            You also may configure the domain name and the DNS server settings, if necessary.

            Collect this information and see the instructions in Cisco Unified IP Phone Settings

            Cisco Unified IP Phone Security

            The security features protect against several threats, including threats to the identity of the phone and to data. These features establish and maintain authenticated communication streams between the phone and the Cisco Unified Communications Manager server, and digitally sign files before they are delivered.

            For more information about the security features, see the Cisco Unified IP Phone Security Features. Also, refer to Cisco Unified Communications Manager Security Guide.

            Install Locally Significant Certificate

            You can initiate the installation of an Locally Significant Certificate (LSC) from the Security Configuration menu on the phone. This menu also lets you update or remove an LSC.

            Make sure that the appropriate Cisco Unified Communications Manager and the Certificate Authority Proxy Function (CAPF) security configurations are complete:

            • The CTL or ITL file should have a CAPF certificate.
            • The CAPF certificate must exist in the /usr/local/cm/.security/certs folder in every server in the cluster.
            • The CAPF is running and configured.

            For more information, see the Cisco Unified Communications Manager Security Guide.

            To configure an LSC on the phone manually, perform the following procedure. Depending on how you have configured the CAPF, this procedure installs an LSC, updates an existing LSC, or removes an existing LSC.

            To configure an LSC on the phone, follow these steps:

            Before You Begin

            Before You Begin

              Step 1   Obtain the CAPF authentication code that was set when the CAPF was configured.
              Step 2   From the phone, press the Applications Menu button, then choose Settings > Security Configuration.

              You can control access to the Settings Menu by using the Settings Access field in the Cisco Unified Communications Manager Administration Phone Configuration Settings window. For more information, see the Cisco Unified Communications Manager Administration Guide.

              Step 3   Press **# to unlock settings on the Security Configuration menu.

              If a Settings Menu password has been set up, SIP phones present an "Enter password" prompt after you enter **#.

              Step 4   Scroll to LSC and press the Update softkey. The phone prompts for an authentication string.
              Step 5   Enter the authentication code and press the Submit softkey.

              The phone begins to install, update, or remove the LSC, depending on how the CAPF was configured. During the procedure, a series of messages appears in the LSC option field in the Security Configuration menu so that you can monitor progress. When the procedure completes successfully, the phone displays Installed or Not Installed.

              The LSC install, update, or removal process can take a long time to complete. You can stop the process at any time by pressing the Stop softkey from the Security Configuration menu. (Settings must be unlocked before you can press this softkey.)

              When the phone successfully completes the installation procedure, it displays "Success." If the phone displays "Failure," the authorization string may be incorrect or the phone may not be enabled for upgrading. Refer to error messages generated by the CAPF and take appropriate actions.

              You can verify that an LSC is installed on the phone by pressing the Applications Menu button, choosing Settings > Model Information, and ensuring that the LSC setting shows Installed.