Cisco Unified SIP Phone 3905
Phone Connections

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1 |
DC adapter port (DC 4.2V). |
4 |
Network port (10/100 SW) connection. IEEE 802.3af power enabled. |
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2 |
AC-to-DC power supply (optional). |
5 |
Access port (10/100 PC) connection. |
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3 |
AC power wall connection. |
6 |
Handset connection. |
![]() Note |
In the EU and UK, your phone is shipped with a power switch cable that is required in order to provide power to your phone when using an AC-to-DC power supply. Connect the power cord to the power switch cable and then connect the other end of the power switch cable to the DC adapter port. |
Buttons and Hardware

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1 |
Phone screen |
Shows information about your phone such as directory number, active call, and phone menu listings. |
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2 |
Light strip |
Indicates an incoming call (flashing red) or new voice message (steady red). |
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3 |
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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:
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4 |
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Opens or closes the Applications menu. Use it to access call history, user preferences, phone settings, and phone model information. |
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5 |
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Transfers a call. |
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6 |
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Places an active call on hold or resumes a held call. |
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7 |
Keypad |
Allows you to dial phone numbers. |
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8 |
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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). |
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9 |
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Controls the handset and speakerphone volume (off-hook) and the ringer volume (on hook). |
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10 |
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Toggles the microphone on or off. |
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11 |
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Dials the last dialed number. |
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12 |
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Returns to the previous screen or menu. |
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13 |
Handset |
Phone handset. |

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