Cisco Unified SIP Phone 3905 User Guide for Cisco Unified Communications Manager 8.6
Features of Your Cisco Unified SIP Phone 3905
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Features of Your Cisco Unified SIP Phone 3905

Features of Your Cisco Unified SIP Phone 3905

Buttons and Hardware


Phone screen

Shows information about your phone such as directory number, active call, and phone menu listings.


Light strip

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


Navigation bar and Select/Feature button

The Navigation bar allows you to scroll through menus and highlight items. The Select button (in the middle of the Navigation bar) allows you to select a highlighted item.

When the phone is off-hook, the Select button functions as the Feature button. You can access these features:

  • Call Forward All: Allows you to forward a call.
  • Voice Mail: Allows you access voice mails.
  • Call Pickup: Allows you to answer a call that is ringing on a co-worker's phone.
  • Group Call Pickup: Allows you to answer a call that is ringing in another call group.


Applications button

Opens or closes the Applications menu. Use it to access call history, user preferences, phone settings, and phone model information.


Transfer button

Transfers a call.


Hold/Resume button

Places an active call on hold or resumes a held call.



Allows you to dial phone numbers.


Speakerphone button

Selects the speakerphone as the default audio path and initiates a new call, picks up an incoming call, or ends a call. The speakerphone audio path does not change until a new default audio path is selected (for example, by picking up the handset).


Volume button

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


Mute button

Toggles the microphone on or off.


Redial button

Dials the last dialed number.


Back button

Returns to the previous screen or menu.



Phone handset.

Phone Screen



Displays date and time. Also displays line information such as voicemail and missed calls. When using the Applications menu, displays phone menu listings.

The format that the phone uses to display dates is set up by your system administrator. The possible formats are:

  • Day, Month, Year (DD/MM/YYYY)

  • Month, Day, Year (MM/DD/YYYY)

  • Year, Month, Day (YYYY/MM/DD)


Line details and other phone information

Displays the directory number. During a call, also displays details for the active line. If not on a call, also displays line text label and other information such as placed calls and phone menu listings.

Phone Connections

Use the following figure to connect the phone to the network.


DC adapter port (DC 4.2V).


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


AC-to-DC power supply (optional).


Access port (10/100 PC) connection.


AC power wall connection.


Handset connection.


The Cisco Unified IP Phone 3905 has a foldable footstand. When the footstand is unfolded, it gives the phone an elevated viewing angle.

Clean the Phone Display

Phone displays that are not touchscreens can be easily cleaned.

Wipe the screen with a soft, dry cloth.

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

Adjust the Handset Rest

If your phone is wall-mounted, you may need to adjust the handset rest to ensure that the receiver does not slip out of the cradle.

    Step 1   Remove the handset from the cradle and pull the plastic tab from the handset rest.
    Step 2   Rotate the tab 180 degrees.
    Step 3   Hold the tab between two fingers, with the corner notches facing you.
    Step 4   Line up the tab with the slot in the cradle and press the tab evenly into the slot. An extension protrudes from the top of the rotated tab.
    Step 5   Return the handset to the handset rest.