Cisco Unified SIP Phone 3900 Series

Cisco Unified SIP Phone 3911

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Cisco® Unified Communications Solutions unify voice, video, data, and mobile applications on fixed and mobile networks, delivering a media-rich collaboration experience across business, government agency, and institutional workspaces. These applications use the network as the platform to enhance comparative advantage by accelerating decision time and reducing transaction time. The security, resilience, and scalability of the network enable users in any workspace to easily connect anywhere, anytime, and anyplace, using any media, device or operating system. Cisco Unified Communications is part of a comprehensive solution that includes network infrastructure, security, wireless, management applications, lifecycle services, flexible deployment and outsourced management options, and third-party applications.

The Cisco Unified SIP Phone 3911 is a cost-effective, entry-level phone that addresses the needs of a lobby, laboratory, manufacturing floor, and hallway. The capabilities of the phone can also fill the communication needs of cubicle, retail, classroom, or manufacturing workers or anyone who exhibits low to moderate telephone usage. This single-line phone has a half-duplex speakerphone and internal microphone. The Cisco Unified SIP Phone 3911 provides fixed feature keys for one-touch access to redial, transfer, conference, hold, line select, mute, speakerphone, and voicemail access features. The line select, mute, conference, Message Waiting Indicator, and speakerphone keys provide LEDs to indicate status for these features. In addition, the phone supports a 2-line x 24-character display along with two menu select keys and a two-way rocker for scrolling control. This display enables support for additional capabilities such as caller ID, call history, and the ability to configure the phone. Finally, the Cisco Unified SIP Phone 3911 (Figure 1) offers the choice of IEEE 802.3af Power over Ethernet (PoE), or local power through an optional power adaptor.

Figure 1. Cisco Unified SIP Phone 3911


The Cisco Unified SIP Phone 3911 is designed to grow with your organization. Tables 1 through 7 present the features, specifications, and compliance information of the Cisco Unified SIP Phone 3911, Table 8 provides ordering information, and Table 9 lists available optional accessories.

Table 1. Features and Descriptions



Hold or Resume key

Places a call on hold when pressed, and resumes the held call when pressed again

Lighted Speakerphone key

Lights when pressed to indicate that the speakerphone is currently being used

Lighted Mute key

Lights when pressed to indicate that the microphone has been muted

Lighted Line key

Flashes fast when an incoming call is received during the alerting stage of the call; it can be used to answer the call during the alerting stage, in which case the phone uses the speakerphone and thus the speakerphone key is lit; when the call is answered the key stays lit until the call is completed

If pressed when no calls are being made, it places the phone off hook and provides dial tone through the speaker; both the Line key and the Speakerphone keys are lit

Flashes when a call has been placed on hold; can also be used to retrieve the call from hold

Lighted Conference key

Can be used during a call to conference a third party into the current call; flashes while the conference call is set up and remains lit after the 3-way call is established

Redial key

Can be used to redial the last person called

Transfer key

Can be used to transfer a call

Lighted message waiting indicator

Lights when there is new voicemail (also the Voicemail key lights) and stays lit until new voicemail has been processed by the user; when pressed, connects the user to the voicemail system

Graphical display

Graphical monochrome display with a resolution of 144 x 32 pixels, providing a scrollable 2-line intuitive access to Directory Services and configuration

Scroll toggle bar

The scroll toggle bar allows easy movement through the displayed information

Network features

Cisco Discovery Protocol; IEEE 802.1 p/q tagging and switching

Volume control

A volume-control toggle to provide easy decibel-level adjustments of the handset, monitor speaker, and ringer

Single-position foot stand

Optimum display viewing and comfortable use of keys; the foot stand can be removed for wall mounting with mounting holes located on the base of the phone

American Disabilities Act (ADA) features

Hearing aid-compatible (HAC) handset that meets the requirements set by the ADA; it also meets ADA HAC requirements for a magnetic coupling to approved hearing aids; the phone dialing pad also complies with the ADA

Signaling protocol support

Compatible with Cisco CallManager Version 5.0(x) and later, using Session Initiation Protocol (SIP)

Codec support

G.711, G.729, and G.729a audio-compression codecs

Configuration options

Provisioning of network parameters through Dynamic Host Configuration Protocol (DHCP)

Voice quality

Voice activity detection (VAD)

Table 2. Security Features




Secures access to the phone configuration menu

Table 3. Software and Physical Specifications



Firmware upgrades

Firmware upgrades available for download from

Software upgrades

Software upgrade supported using a Trivial File Transfer Protocol (TFTP) server

Dimensions (H x W x D)

7.87 in. x 7.08 in. x 1.77 in. (200 mm x 180 mm x 45 mm)


1.1 lb (505 g)

Phone casing composition

Plastic (resin ABS-HB, Resin: SD-0150) in textured dark gray

Table 4. Power Options



IEEE 802.3af PoE

Phone can receive power from IEEE 802.3af-compliant switches

Local power

Phone can also be powered locally with a power adapter (CP-PWR-CUBE-3=) along with one of the power cords listed in Table 5

Power injector

Cisco Unified IP Phone Power Injector (CP-PWR-INJ), which can also be used to power the Cisco Unified SIP Phone 3911

Table 5. AC Region and County-Specific Power Cords (Needed only when phone is powered locally with the CP-PWR-CUBE-3)

Part Number



Asia Pacific






North America




European Community






United Kingdom

Table 6. Temperature Ratings



Operating temperature

23 to 104°F (-5 to 40°C)

Relative humidity

90% +/-5

Storage temperature

Up to 140°F (60°C)

Table 7. Certifications



Regulatory compliance

Products with the CE Marking indicate compliance with the 89/336/EEC and 73/23/EEC directives, which include the safety and EMC standards listed below.


• UL 60950
• CSA-C22.2 No. 60950
• EN 60950
• IEC 60950
• AS/NZS 60950

Electromagnetic compatibility

• 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
• EN55024
• EN50082-1
• EN 61000-3-2
• EN 61000-3-3
• EN 61000-6-1
• EN300386
• KN22 Class B


• CS-03 - HAC
• FCC Part 68 (HAC)
• AS/ACIF S004
• AS/ACIF S040
• NZ PTC 220 DR

Industry Standards

• TIA 810 A

Table 8. Ordering Information

Part Number



Cisco Unified SIP Phone 3911 (license available as a configuration option)


Spare Cisco Unified SIP Phone 3911


SKU for tier 2 distributors only

Table 9. Optional Accessories

Part Number



Spare phone handset cord


Universal locking wall-mounting kit


Local power adapter for sites where PoE is not available; refer to Table 5 for the right power cord part number for your region


The Cisco Unified IP Phone Power Injector (CP-PWR-INJ) can also be used to power the Cisco Unified SIP Phone 3911


The Cisco Unified SIP Phone 3911 is covered by a Cisco standard 90-day hardware warranty.

Cisco Unified Communications Services

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Our unique lifecycle approach to services defines the requisite activities at each phase of the solution lifecycle. Customized planning and design services focus on creating a solution that meets your business needs. Award-winning technical support increases operational efficiency. Remote management services simplify day-to-day operations, and optimization services enhance solution performance as your business needs change.