VoIP phone SIP RTCP RTP SRTP SDP 5 lines Power Adapter Sold Separately

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Cisco CP-8811-K9 IP Phone Overview


The Cisco IP Phone 8811 is a cost-effective, business-class collaboration endpoint that delivers high-fidelity, reliable, secure and scalable voice communications for midsize to large enterprise businesses. With the Cisco IP Phone 8811, you can increase personal productivity through an engaging user experience that is both powerful and easy-to-use. The IP Phone 8811 combines an attractive ergonomic design with wideband audio for crystal clear voice communications, "always-on" reliability, encrypted voice communications to enhance security and access to a comprehensive suite of unified communications features from Cisco communication servers. The Cisco IP Phone 8811 supports five programmable line keys. You can configure keys to support either multiple directory numbers or calling features such as speed dial. You can also boost productivity by handling multiple calls for each directory number, using the multicall-per-line feature. Fixed-function keys give you one-touch access to applications, messaging, directory, as well as often-used calling features such as hold/resume, transfer, and conference. Backlit acoustic keys provide flexibility for audio path selection and switching. The Cisco IP Phone 8811 offers a 5-in. high-resolution (800 x 480) widescreen backlit grayscale display. Localized language support, including right-to-left on-screen text, meets the needs of global users. The phone supports a built-in Gigabit Ethernet switch for your PC connection.


Display 5'' (800480) monochrome display with white backlight
Ethernet Switch10/100/1000
Programmable line keys4
Number of Line Keys5
Full Duplex SpeakerphoneYes
Wideband AudioYes
PoE ClassificationClass 2
Third-party Call ControlYes
Replaceable BezelYes (Black, Silver)
Wall MountableYes
Audio codec supportG.711a-law and mu-law, G.722, G.729a, Internet Low Bitrate Codec (iLBC), and Internet Speech Audio Codec (iSAC)
Call featuresDialingAbbreviated dialingAdjustable ring tones and volume levelsAdjustable display brightnessAgent greetingAuto-answerAuto-detection of headsetcBargeBusy Lamp Field (BLF)Busy Lamp Field (BLF) PickupBusy Lamp Field (BLF) speed dialCallbackCall forwardCall forward notificationCall filterCall history listsCall parkCall pickupCall timerCall waitingCall chaperoneCaller IDCorporate directoryConference, including traditional Join featureCross Cluster Extension Mobility (EMCC)Direct transferExtension mobilityFast-dial serviceForced access codes and client matter codesGroup call pickupHoldIntercomImmediate divertMalicious-caller IDMessage-waiting indicator (MWI)Meet-me conferenceMobilityMusic on hold (MoH)MuteNetwork profiles (automatic)On- and off-network distinctive ringingPersonal directoryPickUpPredialing before sendingPrivacyPrivate Line Automated Ringdown (PLAR)RedialRing tone per line appearanceService Uniform Resource Locator (URL)Shared lineSilent monitoring and recordingSpeed dialTime and date displayTransferUniform Resource Identifier (URI) dialingVisual voice mailVoice mailWhisper coaching
Electronic hookswitchYou can control the hookswitch electronically with a third-party headset connected to an auxiliary port.
Quality-of-service (QoS) optionsThe phone supports Cisco Discovery Protocol and 802.1Q/p standards, and can be configured with an 801.1Q VLAN header containing the VLAN ID overrides configured by the Admin VLAN ID.
Network featuresSession Initiation Protocol (SIP) for signalingSession Description Protocol (SDP)IPv4 and IPv6User Datagram Protocol (UDP) (used only for Real-Time Transport Protocol [RTP] streams)Dynamic Host Configuration Protocol (DHCP) client or static configurationGratuitous Address Resolution Protocol (GARP)Domain Name System (DNS)Trivial File Transfer Protocol (TFTP)Secure Hypertext Transfer Protocol (HTTPS)VLANReal-Time Transport Protocol (RTP)Real-Time Control Protocol (RTCP)Cisco Peer-to-Peer Distribution Protocol (PPDP)Cisco Discovery ProtocolLLDP (including LLDP-MED)Switch speed auto-negotiation
Security featuresSecure bootSecure credential storageDevice authenticationConfiguration file authentication and encryptionImage authenticationRandom bit generationHardware cryptographic accelerationCertificate Authority Proxy Function (CAPF)Manufacturer-Installed Certificates (MIC)Locally Significant Certificates (LSC)Ethernet 802.1x supplicant options: Extensible Authentication Protocol-Flexible Authentication via Secure Tunneling (EAP-FAST) and Extensible Authentication Protocol-Transport Layer Security (EAP-TLS)Signaling authentication and encryption using TLSMedia authentication and encryption using SRTPHTTPS for client and server secure Shell (SSH) Protocol server secure Sockets Layer (SSL)-based VPN client
Physical dimensions
(H  W  D)
9.02 x 10.13 x 1.57 in. (229.1 x 257.34 x 40 mm)
(excluding foot stand)
Weight (with handset)2.58 lb (1.17 kg)
Phone-casing compositionPolycarbonate acrylonitrile butadiene styrene (ABS) textured plastic; Cosmetic class A
Operational temperature32 to 104F (0 to 40C)
Nonoperational temperature shock14 to 140F (-10 to 60C)
HumidityOperating 10 to 90%, noncondensingNonoperating 10 to 95%, noncondensing





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