Cisco Unified IP Conference Phone 8831 User Guide for Cisco Unified Communications Manager 9.0
Features of your Cisco Unified IP Phone
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Features of your Cisco Unified IP Phone

Features of your Cisco Unified IP Phone

The Cisco Unified IP Conference Phone 8831 is a full-featured single line conference station that provides voice communication over an IP network. It functions much like a digital business phone, allowing you to place and receive calls and to access features such as mute, hold, transfer, speed dial, call forward, and more. In addition, because conference stations connect to your data network, they offer enhanced IP telephony features, including access to network information and services, and customizable features and services.

The conference station provides a backlit LCD screen, support for up to ten speed-dial numbers, and a variety of other sophisticated functions. Optional microphone extension kits provide enhanced room coverage that can be further expanded by linking two units together.

In addition to basic call-handling features, your conference station can provide enhanced productivity features that extend your call-handling capabilities. Depending on configuration, the conference station supports:

  • Access to network data, XML applications, and web-based services.
  • Online customizing of conference station features and services from your User Options web pages.

Buttons and hardware

The Conference Phone has two primary components:
  • Display Control Unit (DCU)
  • Sound Base
In addition, the following optional extension kits can be added to or used with the conference phone:
  • Wired Microphone Extension Kit
  • Wireless Microphone Extension Kit and Charger

For your conference phone to work, it must be connected to the corporate IP telephony network.

Display Control Unit

The Display Control Unit (DCU) is tethered to the Sound Base via a micro USB connector.

You can use the graphic and table below to identify buttons and hardware on the DCU.

Table 1 Display Control Unit buttons and softkeys
  Item Description


Phone screen

LCD screen that displays conference phone menus and features.



Four programmable keys.


Navigator with Select key

2-way navigation bar and Select key that allows you scroll menus and select items on the display.


Call button

LED backlit call button.

Press this key to:
  • Go Off Hook
  • Answer an incoming call
  • Obtain a dial tone to initiate a call
  • Resume a call
  • Release a call



Allows you to dial phone numbers and enter letters.


Mute button

Toggles the Mute feature. A red back light indicates a call is on mute.


Volume rocker

2-way rocker switch that raises the volume of the speaker.


For details on DCU LED behavior, see LED state definitions.

Sound Base

The Sound Base provides 360 degree audio coverage via four built-in microphones and supports a full duplex speaker phone.

To provide enhanced room coverage, two sound base units can be linked together.

You can use the graphic and table below to identify buttons and connections on the Sound Base.

Table 2 Sound Base buttons



1, 2, 3

LED indicators

Three LED indicators provide call status information. For details on LED behaviour, see LED state definitions.


Mute button

Backlit mute button.

Wireless extension microphone and charger kit

The optional wireless extension microphone and charger kit unit contains two omni-directional wireless microphones, a charger unit and two country specific AC power clip adaptors for powering the charger unit. Connecting a microphone kit enhances the room coverage of the conference station.

Table 3  Wireless microphone and charger buttons and features
Item Description


Omni-directional wireless microphones


LED charge status indicator


Charger tray


Mute button


Battery compartment


Charging contacts


Please see the FCC ID approval number under the Battery Cover for CP-MIC-WRLS-S-US= Wireless Microphone. FCC ID: LDKMICWR0776


Please see the Canada IC approval number under the Battery Cover for the CP-MIC-WRLS-S-US= Wireless Microphone. IC: 2461B-MICWR0776

Wired extension microphone kit

The optional wired extension microphone kit includes two wired omni-directional microphones. Connecting a microphone kit enhances the room coverage of the conference phone. The sound base has two wired microphone ports and you can connect one or both wired microphones.

If the conference phone is connected to another sound base in Linked Mode, the primary base station supports one or two wireless microphones, or it supports one wired microphone. The secondary unit supports only one wired microphone; a wireless microphone cannot be connected to a secondary Sound Base. You cannot mix microphone kits: if you plan to connect a microphone to both sound bases, they must both be wired microphones.


Wired and wireless microphones cannot be used at the same time, and the wireless microphones have a higher priority. Attempting to connect a wired microphone to a conference phone that has paired or connected channels results in a warning to the user that the wired microphone is disabled. To solve this problem, unpair any paired or connected wireless microphones before connecting a wired microphone.

Table 4 Wired microphone buttons
Item Description


Mute button.

Phone screen

The LCD screen of the phone is located on the DCU. The idle or home screen displays information about the status of calls and features.

If the conference phone is in an offline state, the idle screen displays the message Phone is not registered and the Apps softkey remains available.

You can use the graphic and table below to identify the features and functions available on the screen.

Table 5  Phone screen layout.
  Item Description



Displays date, time, and current directory number. Displays menu name when applicable.


Line details and other phone information

Displays line label, call details, and status messages such as missed calls, message waiting, and line forwarding information.


Call State icon

Indicates the status of a call, such as ringing, hold, encrypted or connected call.


Softkey labels

Displays softkeys for currently available features or actions.

5, 6

Feature icons

These icons are displayed when an associated feature, such as extension microphones (5) or Link mode (6) is connected.

Phone screen icons

Table 6 Phone screen icons



On hook

Off hook

Ringing in



Shared line

Microphone connected

Linked mode


Phone screen cleaning


Use only a soft, dry cloth to wipe your conference station display screen. Do not use any liquids or powders on the phone, as they can contaminate phone components and cause failures.

Phone connections

Network and power are connected to the phone from the Sound Base. The mini-USB connection for the DCU, the wired microphone ports and the daisy chain port for the Linked Mode feature are also located on the base.

You can use the graphic and table below to identify connections and ports on the Sound Base.

Table 7 Sound Base connections and ports
  Item Description


Network port

Network port (10/100 SW) connection. IEEE 802.3af power enabled.


Wall power

Local power connection.


Mini USB port

Connects the base station to the DCU.


When connecting the USB cable, firmly press down on the ferrite bead to ensure it is seated correctly between the posts.


Wired microphone ports

Two RJ11 microphone ports. An optional wired microphone can be connected to each port.


Linked Mode daisy chain port

Supports the connection of two base stations in Linked Mode.

Connect mini-USB cable to DCU

The following images show how to install the USB cable.

    Step 1   Insert the mini-USB connector into the port on the base of the phone.
    Step 2   Seat the ferrite bead between the posts.
    Step 3   Push the bead down firmly.
    Step 4   Leave some slack in the cable.
    Step 5   Thread the cable in the cable channel.

    Install ferrite bead on network cable

    The following images show how to install the ferrite bead on the network cable.

      Step 1   Align the ferrite bead with the head of the network cable and move the ferrite bead along the cable until there is a gap of 1.0 mm +/- 0.3 mm between the bead and the connector.
      Step 2   Place the cable into the ferrite bead channel and loop the cable around the ferrite bead so that the cable exits the bottom of the bead.
      Step 3   Hold the cable in the ferrite bead channel and close the ferrite bead. Both snaps on the ferrite bead should engage.

      Remove ferrite bead

          Command or Action Purpose
        Step 1 Disengage the snap enclosure with a small screwdriver as shown in the figure.  


        General IP Phone information

        Power-saving mode

        Your conference station supports the Cisco EnergyWise (EW) program. Your system administrator sets up sleep (power down) and wake (power up) times for your conference station to save energy. In the sleep state, the LED for the sound base Mute button becomes solid gray, and the DCU powers off.

        Ten minutes before the scheduled sleep time, you receive a message that the conference station will power down at a specific time. If the power-saving mode is enabled by your system administrator, you hear your ringtone play. The ringtone plays according to the following schedule:

        • At 10 minutes before power down, the ringtone plays four times
        • At 7 minutes before power down, the ringtone plays four times
        • At 4 minutes before power down, the ringtone plays four times
        • At 30 seconds before power down, the ringtone plays 15 times or until the phone powers down

        If your conference station is inactive (idle) at the sleep time, it powers down. If your conference station is active (for example, on a call), it waits until it has been inactive for a period of time before removing power.

        After the conference station goes to sleep, press the Mute button on the sound base to wake the conference station up. You cannot wake the conference station using the DCU. After it is inactive for a period of time, the conference station goes back to sleep. At the set wake time, the conference station powers up.

        Wake and sleep times are also linked to the configured days that you normally work. If your requirements change (for example, your work hours or work days change), contact your system administrator to have your conference station reconfigured.

        For more information about EnergyWise and your conference station, contact your system administrator.

        Feature availability

        Depending on the conference station system configuration, features included in this guide might not be available to you or might work differently on the conference station. Contact your support desk or system administrator for information about feature operation or availability.