HOME PRODUCT Cisco VoIP Phone Unified SIP Phone CP-3905=


Product ID : CP-3905=
Product Description
Cisco Unified SIP Phone 3905, Charcoal, Standard Handset

Product Overview

The Cisco® Unified SIP Phone 3905 is a cost-effective, entry-level IP phone that addresses the need for basic voice communications with common Cisco Unified Communications features in an attractive design that is also budget-friendly. The phone can fill the communication needs of cubicle, retail, classroom, manufacturing floor and hallway, as well as various wall-mounted deployments.

The single-line Cisco Unified SIP Phone 3905 supports two calls per line. Fixed keys for redial, transfer, and hold/resume, along with a full-duplex speakerphone and two-line display, which comes standard, deliver a more productive, easier-to-use, and flexible endpoint experience. With its dual-port 10/100 Ethernet switch for network and PC connections, the Cisco Unified SIP Phone 3905 offers IT organizations a cost-effective solution to reduce cabling infrastructure and administration costs at the desktop.

The phone is also eco-friendly, taking advantage of reground and recyclable plastics to deliver a more earth-responsible solution.

Features and Benefits

Table 1 lists features and benefits of the Cisco Unified SIP Phone 3905.

Table 1. Features and Benefits




Ergonomic design

The phone offers an easy-to-use interface and provides a traditional telephony-like user experience.


A graphical monochrome display with a resolution of 128 x 32 pixels provides a scrollable two-line intuitive access to phone services and configuration.

Foot stand

A foldable single-position foot stand offers optimum display viewing and comfortable use of keys.

Wall mountable

You can fold the foot stand for wall mounting, with mounting holes located on the base of the phone.


A full-duplex speakerphone allows for flexibility in placing and receiving calls.

Volume control

The volume control toggle makes it easy to adjust the volume of the handset, speakerphone, and ringer.

Ethernet switch

The phone has a 10/100BASE-T Ethernet connection through two RJ-45 ports, one for the LAN connection and the other for connecting a downstream Ethernet device such as a PC.


The phone has the following buttons:

 Select, Back, and Two-Way Navigation
 Redial, Transfer, and Hold/Resume
 Standard dial pad
 Mute, Volume Up/Down, and Speakerphone


Signaling protocol

Session Initiation Protocol (SIP) is supported.

Call features

 Adjustable volume levels
 Auto barge
 Call forward
 Call pickup
 Call waiting
 Call transfer
 Forced Authorization Codes (FAC)
 Group call pickup
 Message-waiting indicator
 Music on hold
 Private-line automatic ringdown (PLAR)
 Shared line

Audio codec support

G.711a, G.711μ, G.729, G.729a, and G.729ab.

Voice quality

Comfort-noise generation (CNG) and voice-activity-detection (VAD) programming is provided on a system basis.

Configuration options

 Dynamic Host Configuration Protocol (DHCP) client or static configuration
 Support for online firmware upgrades using Trivial File Transfer Protocol (TFTP)
 Domain Name System (DNS)

Provisioning and manufacturing

 Web server for configuration and statistics
 Real-Time Control Protocol (RTCP) support and monitoring

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