Cisco IP Phone Key Expansion Module Setup Overview
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The Cisco IP Phone 8800 Key Expansion Module adds extra programmable buttons to the phone. The programmable buttons can be set up as phone speed-dial buttons, or phone feature buttons.
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Cisco IP Phone 8800 Key Expansion Module—Single LCD screen module, 18 line keys, 2 pages, two-column display only.
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Cisco IP Phone 8851/8861 Key Expansion Module—Dual LCD screen module for audio phones, 14 line keys, 2 pages, one-column display only.
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Cisco IP Phone 8865 Key Expansion Module—Dual LCD screen module for video phones, 14 line keys, 2 pages, one-column display only.
The Cisco IP Phone 8851/8861 Key Expansion Module and the Cisco IP Phone 8865 Key Expansion Module require Firmware Release 11.2(3) or later. |
You can use more than one expansion module per phone. But each module must be the same type. You cannot mix Cisco IP Phone 8800 Key Expansion Module with a Cisco IP Phone 8851/8861 Key Expansion Module or with a Cisco IP Phone 8865 Key Expansion Module. You cannot mix audio expansion modules with video expansion modules. You also cannot use a video expansion module on an audio phone or an audio expansion module on a video phone.
The following table lists the phones and the number of key expansion modules that each model supports.
Cisco IP Phone Model |
Supported Number of Key Expansion Modules and Buttons |
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Cisco IP Phone 8851 |
2; single LCD screen, 18 line keys, two pages, providing 72 buttons |
Cisco IP Phone 8861 |
3; single LCD screen, 18 line keys, two pages, providing 108 buttons |
Cisco IP Phone 8865 |
3; single LCD screen, 18 line keys, two pages, providing 108 buttons, |
Cisco IP Phone Model |
Supported Numbers of Key Expansion Modules and Buttons |
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Cisco IP Phone 8851 |
2; dual LCD screen, 14 line keys, two pages, providing 56 buttons |
Cisco IP Phone 8861 |
3; dual LCD screen, 14 line keys, two pages, providing 84 buttons |
Cisco IP Phone 8865 |
3; dual LCD screen, 14 line keys, two pages, providing 84 buttons |
Key Expansion Module Power Information
If you use a key expansion module with your IP phone, then Power over Ethernet (PoE) is enough to power your expansion modules. But, your phone must have an IP address in order to charge the expansion module.
A power cube is needed for smartphone or tablet charging when your key expansion module is attached.
A key expansion module uses 48V DC, 5W per module. If you are charging a smartphone or a tablet, note the following:
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Side USB: Up to 500mA/2.5W charging
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Back USB: Fast charging, Supports up to 2.1A/10.5W charging
Configuration |
802.3af Power over Ethernet (PoE) |
802.3at PoE |
Cisco IP Phone Power Cube 4 |
---|---|---|---|
8851 with 1 key expansion module |
Yes |
Yes |
Yes |
8851with 2 key expansion modules |
No |
No See the third note below |
Yes |
8861 with 1 key expansion module |
No |
Yes |
Yes |
8861 with 2 key expansion modules |
No |
Yes See the first note below |
Yes |
8861 with 3 key expansion modules |
No |
Yes See the first note below |
Yes |
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Configuration |
802.3af Power over Ethernet (PoE) |
802.3at PoE |
Cisco IP Phone Power Cube 4 |
---|---|---|---|
8851 with 1 key expansion module |
Yes |
Yes |
Yes |
8851with 2 key expansion modules |
No |
Yes See the third note below |
Yes |
8861 and 8865 with 1 key expansion module |
No |
Yes |
Yes |
8861 and 8865 with 2 key expansion modules |
No |
Yes See the first note below |
Yes |
8861 and 8865 with 3 key expansion modules |
No |
Yes See the first note below |
Yes |
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Key Expansion Module Buttons and Hardware


The following table describes the features of the key expansion module.
LCD screen—Displays the phone number, speed-dial number (or name or other text label), phone service, or phone feature assigned to each button. Icons that indicate line status resemble (in both appearance and function) the icons on the phone to which the key expansion module is attached. |
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1 |
Lighted buttons—Line buttons. Each button or pair of buttons corresponds to one line. The lights beneath each button indicate the state of the corresponding line as follows:
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2 |
Shift buttons—2 buttons. The button for page 1 is labeled as 1 and the button for page 2 is labeled as 2. The lights in each button indicate the state of the page as follows:
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Column Modes
If you are using the Cisco IP Phone 8800 Key Expansion Module, two-column mode is the default on the Cisco IP Phone 8800 Key Expansion Module.
The Cisco IP Phone 8851/8861 Key Expansion Module and the Cisco IP Phone 8865 Key Expansion Module only support one-column mode and these key expansion modules do not support two-column mode.
One-Column Mode
One-column mode in Cisco IP Phone 8851/8861 Key Expansion Module and Cisco IP Phone 8865 Key Expansion Module—Each button on the right of the screen is assigned to a speed-dial number (or name or other text label), phone service, or phone feature. In this configuration, the key expansion module displays up to 14 items on page 1, and up to 14 items on page 2.
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Two-Column Mode
If you are using Cisco IP Phone 8800 Key Expansion Module single-LCD screen expansion module, you can set up the module in two-column mode.
In two-column mode, each button on the left and right of the screen is assigned to a speed-dial number (or name or other text label), phone service, or phone feature. In this configuration, the key expansion module displays up to 18 items on page 1, and up to 18 items on page 2

Allocate a Key Expansion Module Type with the Phone Menu
You can assign the type of key expansion module that the phone supports.
1 |
Press Applications |
2 |
Select . |
3 |
Select the key expansion module type. |
4 |
Press Save. |
Adjust the Screen Brightness (8800 Series)
You can change the brightness of the key expansion module screen to make it easier to read.
1 |
Press Applications |
2 |
Select . |
3 |
Select . |
4 |
Enter a number between 1-12. |
5 |
Enter a number between 4-15. |
6 |
Press Set. |
Modify a Speed Dial on a Key Expansion Module
If one of the line keys on the key expansion module is configured as a speed dial, you can press the line key to change the speed-dial number. You can also verify this change by checking the Unit field on the phone web page. When the line keys on the key expansion module are configured as a blf, blf+call pickup, blf+call park, or call park, you cannot change the speed-dial number when you press the line key.
Before you begin
Configure a key expansion module before you add a speed dial.
1 |
Press a key expansion module speed-dial key for at least 2 seconds. |
2 |
In the Define Speed Dial window, add the speed-dial name and phone number to call when you press the key expansion module speed-dial key. |
3 |
Press Save. |