• Wideband acoustics
  • Two-element speaker
  • Support for DECT wireless extension microphones
  • Session Initiation Protocol (SIP) signaling
  • Device authentication and signaling encryption

Additional information




Cisco CP-8831-K9 IP Phone Overview


Take full control of conference calls with this Cisco Unified IP conference phone. It delivers superior high-definition audio and 360-degree coverage for conference rooms in a variety of sizes, along with executive offices. This phone system is a technologically advanced solution for highly secure communications, boasting wideband, full-duplex audio performance. The Cisco Unified IP conference phone delivers highly secure, comprehensive, mission-critical unified communications with especially comprehensive audio performance and flexible accessory options. Security is ensured thanks to device authentication and signaling encryption, which uses Transport Layer Security (TLS) with Advanced Encryption Standard 128 (AES-128). This Cisco phone system also includes support for daisy chaining two units, providing extended room coverage. Because it has a two-element speaker, the phone can capture the full voice spectrum, ensuring clear acoustics throughout the audio communication. Support for DECT wireless extension microphones is another feature of this conference call system; up to two microphones can be used simultaneously. This device also features Session Initiation Protocol (SIP) signaling, allowing for Internet telephony function for voice and video calls over online connections.


Display 3.5'' - 396 x 162 pixel-based anti-glare graphical monochrome display with white backlight
Ethernet Switch 10/100
Programmable Line Keys 4
Number of Line Keys 1
Full Duplex Speakerphone Yes
Wideband Audio Yes
PoE Classification Class 3
Hands Free Yes Speakerphone
Third-party Call Control Yes
Bluetooth / DECT DECT (mics)
Power IEEE 802.3af line power, CP-PWR-CUBE-3
Dimensions (H x W x D) Base: 15.05 x 26.35 x 5.08 cm

Control panel: 14.61 x 12.7 x 2.54 cm
Signaling protocol support Session Initiation Protocol (SIP)
Codec support G.711, G.729 (a and ab), G.722, and Internet Low Bitrate Codec (iLBC)
Calling feature support Dialing (E.164)Adjustable ringing and volume levels adjustable display brightness applications launch padAuto-answerAuto-detection of headsetBargeCall forwardCall history listsCall timerCall waiting caller IDCorporate directoryConferenceDirect transferFast-dial serviceHoldImmediate divertJoinMessage-waiting indicatorMusic on holdMuteNetwork profiles (automatic)On- and off-network distinctive ringingPersonal directoryPredialing before sendingPrivacyRing tone per line appearance shared lineSurvivable Remote Site Telephony (SRST)Time and date displayTransferVoicemail
Directories The Cisco Unified IP Conference Phone 8831 identifies incoming messages and categorizes them for users on the screen. This feature allows you to quickly and effectively return calls using direct dial-back capability. The corporate directory integrates with the Lightweight Directory Access Protocol Version 3 (LDAPv3) standard directory.
Apps The Apps softkey allows you to enter the Applications menu, where you are able to adjust display contrast, select background images (if available), and select from a large number of unique ringer sounds through the User Preference menu. Network Configuration preferences also can be set up (usually by the system administrator). Configuration can be either automatically or manually set up for Dynamic Host Control Protocol (DHCP), Trivial File Transfer Protocol (TFTP), Cisco Unified Communications Manager, and backup Cisco Unified Communications Manager instances.
Help The online Help feature gives you information about the phone keys, buttons, and features. The pixel display allows for more flexible feature navigation and significantly expands the information viewed when using features such as Services, Information, Messages, and Directory. For example, the Directory button can show local and server-based directory information.
Hold, Mute, and Redial keys The Mute key is a fixed key. When it is active, the LED flashes on the Cisco Unified IP Conference Phone 8831 as well as on the optional wired and wireless microphone kits. Hold and Redial are provided as soft keys associated with the screen, and are always at the same position for easy access.
Wired control panel The panel allows easy control of the unit and viewing of the display without having to move the entire unit.
Display The conference station has a large high-resolution, graphical 3.5-inch backlit display (396 x 162 pixels).
Speakerphone The Cisco Unified IP Conference Phone 8831 offers full-duplex high-quality wideband speakerphone technology. Included are Automatic Gain Control, comfort-noise generation, silence suppression and voice activity detection, Echo Suppression, and dynamic noise reduction, which reduces noise by up to 9 dB from constant noise sources such as fans or heating, ventilation, and air conditioning (HVAC) systems.

A two-way high-fidelity loudspeaker system provides superior speech clarity versus traditional conferencing systems.

Volume control The convenient Volume Control buttons on Cisco Unified IP Conference Phone 8831 provide for easy, decibel-level adjustments for the speakerphone and ringer.
Quality-of-service (QoS) options The Cisco Unified IP Conference Phone supports DHCP and 802.1Q/p standards. The conference station can also be configured with an 801.1Q VLAN header containing the VLAN ID overrides configured by the Admin VLAN ID.
Multiple ring tones User-adjustable ring tones are available.
Security The Cisco Unified IP Conference Phone 8831 supports device authentication through 802.1.x supplicant (TLS) and SRTP.
Configuration options You can configure IP address assignment statically or through the DHCP client.




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