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
AC-to-DC power supply (optional).
Access port (10/100 PC) connection.
AC power wall connection.
Buttons and Hardware
Shows information about your phone such as directory number,
active call, and phone menu listings.
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:
All: Allows you to forward a call.
Mail: Allows you access voice mails.
Pickup: Allows you to answer a call that is ringing on a co-worker's phone.
Pickup: Allows you to answer a call that is ringing in another call group.
Opens or closes the Applications menu. Use it to access call
history, user preferences, phone settings, and phone model information.
Transfers a call.
Places an active call on hold or resumes a held call.
Allows you to dial phone numbers.
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).
Controls the handset and speakerphone volume (off-hook) and
the ringer volume (on hook).
Toggles the microphone on or off.
Dials the last dialed number.
Returns to the previous screen or menu.
Displays date and time. Also displays line information such
as voicemail and missed calls. When using the Applications menu, displays phone
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.
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 Screen
If your phone screen gets dirty, wipe it with a soft, dry cloth.
Do not use any liquids or powders on the phone because they can contaminate the phone components and cause failures.
Adjust the Handset Rest
If your phone is wall-mounted or if the handset slips out of the cradle too easily, you may need to adjust the handset rest
to ensure that the receiver does not slip out of the cradle.
Remove the handset from the cradle and pull the plastic tab from the handset rest.
Rotate the tab 180 degrees.
Hold the tab between two fingers, with the corner notches facing you.
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.
Return the handset to the handset rest.
Important Headset Safety Information
High Sound Pressure—Avoid listening to high volume levels for long periods to prevent possible hearing damage.
When you plug in your headset, lower the volume of the headset speaker before you put the headset on. If you remember to lower
the volume before you take the headset off, the volume will start lower when you plug in your headset again.
Be aware of your surroundings. When you use your headset, it may block out important external sounds, particularly in emergencies
or in noisy environments. Don’t use the headset while driving. Don’t leave your headset or headset cables in an area where
people or pets can trip over them. Always supervise children who are near your headset or headset cables.