Cisco Unified IP Phone 3905 User Guide for Cisco Unified Communications Manager Express Version 8.8 (SIP)
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This guide provides phone layout and feature descriptions for the Cisco Unified IP Phone 3905.

Physical Description of Cisco Unified IP Phone 3905

The Cisco Unified IP Phone 3905 is a single-line phone. Buttons near the handset provide direct access to several features.






Functions as traditional phone handset.


Message waiting indicator

Indicates new voice message (steady red) or an incoming call (blinking).


Phone screen

Displays phone menus and call activity including caller ID (phone number), call duration, and call state.


Navigation Pad and Select (center) button

Allows you to scroll through menu items and highlight items. When the phone is on-hook, displays the call logs (Missed Calls, Received Calls, Placed Calls) and your Speed Dials.


Application button

Provides access to phone settings such as call history, user preferences, phone configuration (including administration settings, device configuration, network configuration, and other common configurations), and phone model information.


Previous button

Toggles back to the previous setting.


Hold button

Places an active call on hold.


Transfer button

Transfers active calls to another extension.


Redial button

Dials the last dialed number.



Allows you to dial phone numbers and enter numbers or letters.


Speakerphone button

Selects the speakerphone. When the speakerphone is on, the button is lit.


Volume button

Controls the handset and speakerphone volume (off-hook) and the ringer volume (on-hook).


Mute button

Mutes the speakerphone and handset. If the button is lit, the speaker and handset are muted.

Phone Connections

For your phone to work, it must be connected to the corporate IP telephony network. Your system administrator can help you connect your phone.

1 DC adaptor port (DC 4.2V) 4 Network port (10/100 SW) connection. IEEE 802.3af power enabled.
2 AC-to-DC power supply (optional) 5 Access port (10/100 PC) connection
3 AC power wall plug (optional) 6 Handset connection

Adjusting the Handset Rest

You can adjust the handset rest of a wall-mounted phone so that the receiver does not slip out of the cradle.

    Step 1   Set the handset aside and pull the square plastic tab from the handset rest.
    Step 2   Rotate the tab halfway (180 degrees).
    Step 3   Hold the tab between two fingers, with the small notches (in the corners) facing you.
    Step 4   Make sure the tab lines up evenly with the slot in the cradle.
    Step 5   Slide the tab back into the handset rest. An extension protrudes from the top of the rotated tab. Return the handset to the handset rest.