Cisco Unified SIP Phone 3905 Data Sheet

Data Sheet

Available Languages

Download Options

  • PDF
    (335.9 KB)
    View with Adobe Reader on a variety of devices
Updated:June 6, 2025

Bias-Free Language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

Available Languages

Download Options

  • PDF
    (335.9 KB)
    View with Adobe Reader on a variety of devices
Updated:June 6, 2025
 

 

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

Feature

Benefit

Hardware

Ergonomic design

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

Display

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.

Speakerphone

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.

Buttons

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

Firmware

Signaling protocol

Session Initiation Protocol (SIP) is supported.

Call features

  Adjustable volume levels
  Auto barge
  Call forward
  Call pickup
  Call waiting
  Call transfer
  Conference
  Forced Authorization Codes (FAC)
  Group call pickup
  Message-waiting indicator
  Music on hold
  Private-Line Automatic Ringdown (PLAR)
  Redial
  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
  Syslog

Cisco unified communications manager support

The Cisco Unified SIP Phone 3905 is supported on the Cisco Unified Communications Manager Version 7.1(5) or later, the Cisco Unified Communications Manager Business Edition 3000 Version 8.6, the Cisco Unified Communications Manager Business Edition 5000 Version 8.5 or later, and the Cisco Unified Communications Manager Business Edition 6000 Version 8.5 or later.

Licensing

Phone licensing depends on the call-control platform and its policies. For the Cisco Unified Communications Manager, the Cisco Unified SIP Phone 3905 requires appropriate User Connect Licensing (UCL). There are no special license-plus-phone bundles for tier 2 distributors. The phone is not supported on third-party call-control systems.

Product specifications

Table 2 lists the specifications of the Cisco Unified SIP Phone 3905.

Table 2.        Product specifications

Protocols

SIP

Connectivity

10/100BASE-T wired Ethernet LAN port plus switched PC port.

Memory

  4-MB flash memory
  32-MB synchronous dynamic RAM (SDRAM)

Language support

Arabic (Arabic area), Bulgarian (Bulgaria), Catalan (Spain), Chinese (China), Chinese (Hong Kong), Chinese (Taiwan), Croatian (Croatia), Czech (Czech Republic), Danish (Denmark), Dutch (Netherlands), English (United Kingdom; prompts only), Estonian (Estonia), French (France), Finnish (Finland), German (Germany), Greek (Greece), Hebrew (Israel), Hungarian (Hungary), Italian (Italy), Japanese (Japan), Korean (Korea Republic), Latvian, Lithuanian, Norwegian (Norway), Polish (Poland), Portuguese (Portugal), Portuguese (Brazil), Romanian (Romania), Russian (Russian Federation), Spanish (Spain), Slovak (Slovakia), Swedish (Sweden), Serbian (Republic of Serbia), Serbian (Republic of Montenegro), Slovenian (Slovenia), Thai (Thailand), and Turkish (Turkey) are supported, but in different phases.

Physical dimensions

8.07 x 5.91 x 2.11 in. (205 x 150 x 53.5 mm)

(in slab mode with the foot stand folded)

Weight

20.96 oz (594.3g)

Power over Ethernet (PoE)

IEEE PoE 802.3af is supported, Class 1.

Local power

The phone can also be powered locally with one of the power adapters listed in Table 3.

Power Input Rating

1.5A, 4.2V DC

Operational Temperature

32 to 104°F (0 ~ 40°C)

Relative Humidity

10 to 95% (noncondensing)

Storage Temperature

14 to 140°F (-10 to 60°C)

Cosmetic

Cisco Cosmetic Class B

Approvals and compliance

Regulatory compliance:

  CE markings per directives 2004/108/EC and 2006/95/EC

Safety:

  UL 60950 Second Edition
  CAN/CSA-C22.2 No. 60950 Second Edition
  EN 60950 Second Edition
  IEC 60950 Second Edition
  AS/NZS 60950
  GB4943

EMC:

  FCC Part 15 (CFR 47) Class B
  ICES-003 Class B
  EN55022 Class B
  CISPR22 Class B
  AS/NZS CISPR22 Class B
  VCCI Class B
  KN22 Class B
  CISPR24
  EN55024
  EN61000-3-2
  EN61000-3-3
  KN 24

Telecom:

  FCC Part 68 (47CFR) (HAC)
  Canada-CS-03-HAC
  Australia AS/ACIF S004, AS/ACIF S040
  New Zealand- PTC 220 Draft

Warranty information

Find warranty information on Cisco.com at the Product Warranties page.

Ordering information

Table 3 lists the ordering information for the Cisco Unified SIP Phone 3905. To place an order,
visit the Cisco Ordering Home Page. To download software, visit the Cisco Software Center.

Table 3.        Ordering information

Product Name

Part Number

Cisco Unified SIP Phone 3905, Charcoal, Standard Handset

CP-3905=

Power Adapter for Cisco Unified SIP Phone 3905, Argentina

CP-3905-PWR-AR=

Power Adapter for Cisco Unified SIP Phone 3905, Australia

CP-3905-PWR-AU=

Power Adapter for Cisco Unified SIP Phone 3905, Brazil

CP-3905-PWR-BR=

Power Adapter for Cisco Unified SIP Phone 3905, Central Europe

CP-3905-PWR-CE=

Power Adapter for Cisco Unified SIP Phone 3905, China

CP-3905-PWR-CN=

Power Adapter for Cisco Unified SIP Phone 3905, India

CP-3905-PWR-IN=

Power Adapter for Cisco Unified SIP Phone 3905, Korea

CP-3905-PWR-KR=

Power Adapter for Cisco Unified SIP Phone 3905, North America

CP-3905-PWR-NA=

Power Adapter for Cisco Unified SIP Phone 3905, United Kingdom

CP-3905-PWR-UK=

Power Adapter for Cisco Unified SIP Phone 3905, South Africa

CP-3905-PWR-ZA=

Spare Handset for Cisco Unified SIP Phone 3905, Charcoal

CP-3905-HS=

Spare Handset Cord for Cisco Unified SIP Phone 3905, Charcoal

CP-3905-HS-CORD=

Cisco services

Cisco Services make networks, applications, and the people who use them work better together.

Today, the network is a strategic platform in a world that demands better integration among people, information, and ideas. The network works better when services, together with products, create solutions aligned with business needs and opportunities.

The unique Cisco Lifecycle approach to services defines the requisite activities at each phase of the network lifecycle to help ensure service excellence. With a collaborative delivery methodology that joins the forces of Cisco, our skilled network of partners, and our customers, we achieve the best results.

For more information

For more information about the Cisco Unified SIP Phone 3905,
visit https://www.cisco.com/go/ipphones/3900 or contact your local Cisco account representative.

 

Our experts recommend

Learn more