Data Sheet
Cisco Unified SIP Phone 3911
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 onetouch 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
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Data Sheet
Features
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
Feature Description
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
Lighted Conference key Can be used during a call to conference a third party into the current call; flashes while the
Redial key Can be used to redial the last person called
Transfer key Can be used to transfer a call
Lighted message waiting
indicator
Graphical display Graphical monochrome display with a resolution of 144 x 32 pixels, providing a scrollable 2-
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
Single-position foot stand Optimum display viewing and comfortable use of keys; the foot stand can be removed for
American Disabilities Act
(ADA) features
Signaling protocol support Compatible with Cisco CallManager Version 5.0(x) and later, using Session Initiation
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)
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
conference call is set up and remains lit after the 3-way call is established
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
line intuitive access to Directory Services and configuration
speaker, and ringer
wall mounting with mounting holes located on the base of the phone
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
Protocol (SIP)
Table 2. Security Features
Item Description
Password Secures access to the phone configuration menu
Table 3. Software and Physical Specifications
Item Description
Firmware upgrades Firmware upgrades available for download from Cisco.com
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)
Weight 1.1 lb (505 g)
Phone casing composition Plastic (resin ABS-HB, Resin: SD-0150) in textured dark gray
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