Cisco CP-8811-K9 Unified IP Phone Full English Product Description

Listing Title

Cisco CP-8811-K9 (Charcoal) Cost-Effective Business-Class Gigabit SIP VoIP Desk Phone, 5-inch 800×480 Grayscale Widescreen LCD, 5 Programmable Line Keys, Dual Gigabit Ethernet Switch, IEEE 802.3af PoE Class 2, Wideband Audio, Full-Duplex Speakerphone, RJ-9 Headset Port, Wall-Mountable, Supports CUCM / Webex Calling / Third-Party SIP PBX, Ideal for Office Knowledge Workers, Small-to-Medium Enterprise DeploymentsCisco

Full Commercial Overview

The Cisco CP-8811-K9 belongs to Cisco’s 8800 Series Unified IP Phone portfolio, a cost-optimized enterprise VoIP endpoint designed for mainstream office knowledge workers across small, medium and large organizationsCisco. It delivers reliable, secure wideband voice communications, flexible SIP-based deployment compatibility, and an intuitive user interface without premium extras like color displays or built-in Bluetooth found on higher-tier 8841/8845 modelsCisco.

This phone supports dual firmware modes: native SCCP operation for Cisco Unified Communications Manager (CUCM) on-premises deployments, and Multiplatform Phone (MPP) SIP firmware for Webex Calling, Broadsoft, and other third-party hosted SIP PBX platformsCisco. Key differentiators against other 8800-series devices: grayscale (monochrome) LCD screen, no integrated Bluetooth wireless headset support, Class 2 PoE power rating, and an entry-level feature set focused on core business calling functionsCisco.

Constructed with circular economy sustainable design using post-consumer recycled plastic, the CP-8811-K9 balances enterprise-grade security, energy efficiency via Cisco EnergyWise, and simplified centralized administration for IT teams managing distributed office fleetsCisco.

Core Hardware & Feature Differentiators vs Other 8800 Series Phones

1. 5-inch high-resolution grayscale 800×480 backlit LCD: Distinct from the color TFT displays equipped on CP-8841, 8845, 8861 and upper-tier models; optimized for power efficiency and basic call/status visualizationCisco.
2. No built-in Bluetooth radio: Lacks native pairing support for wireless Bluetooth headsets, a feature exclusive to CP-8845, 8861 and higher video-enabled handsetsCisco.
3. IEEE 802.3af PoE Class 2 power classification: Lower power draw than Class 4 PoE premium models, reducing switch power budget requirements for mass deploymentsCisco Russ....
4. 5 programmable multi-function line keys: Configurable for multiple directory numbers (DN), speed dial, BLF presence monitoring, call park and other UC features; supports multi-call-per-line handling for concurrent inbound/outbound calls per extension.
5. Dual-port Gigabit Ethernet integrated switch: 10/100/1000 Mbps uplink to LAN switch + secondary PC passthrough port, eliminating separate desktop network jacks for employee workstations.
6. Exclusive wideband audio stack: Full-duplex echo-canceling speakerphone, HAC hearing-aid compatible handset, support for standard RJ-9 wired office headsets (no Bluetooth headset support).
7. Flexible dual-firmware deployment architecture: Swappable CUCM SCCP or open-standard MPP SIP firmware, compatible with on-premises CUCM, Webex Calling cloud UC, and third-party hosted SIP PBX platformsCisco.
8. Wall-mountable chassis + replaceable color bezels: Charcoal (CP-8811-K9) and white (CP-8811-W-K9) factory bezel options; optional wall-mount bracket accessory sold separatelyCisco.

Hardware & Physical Design Architecture

1. Chassis, Mounting & Mechanical Specifications

• Form Factor: Ergonomic desktop desk phone chassis with integrated adjustable stand tilt base; optional wall-mount conversion kit supported. Replaceable front bezel: standard CP-8811-K9 charcoal dark gray finish, alternate white variant CP-8811-W-K9 available for light office decor schemesCisco.
• Sustainable Construction: Lead-free, RoHS-compliant components; chassis molded with post-consumer recycled plastic to reduce environmental footprint, Energy Star certified via Cisco EnergyWise power managementCisco.
• Physical Dimensions (Base Stand Deployed): Height × Width × Depth: 202mm × 267mm × 153mm (8.0 × 10.5 × 6.0 inches)
• Total Unit Weight (Including Handset & Cord): ~1.1 kg (2.4 lbs)
• Physical Security: Integrated Kensington lock slot on rear chassis for physical theft prevention in shared office spacesCisco Russ....
• Operating Environment (Indoor Office Only): Operating Temperature: 0°C ~ +40°C (32°F ~ 104°F) Storage Temperature: -10°C ~ +60°C (14°F ~ 140°F) Relative Humidity: 10% – 95% non-condensing

2. Front Panel UI, Display & Button Layout

1. 5-inch widescreen backlit grayscale LCD Panel: Native 800 × 480 pixel resolution, adjustable backlight brightness and timeout power-saving settings. Screen renders caller ID, active line status icons, call timers, missed call alerts, voicemail MWI banners, LDAP corporate directory search results, local call history logs, XML enterprise application content, system clock, and network status indicators.
2. Four context-sensitive softkeys: Labeled dynamically by on-screen text to trigger context-aware calling and menu actions.
3. Five-way circular navigation cluster with central Select button: Scroll directories, call logs, settings menus, and select menu options without repetitive softkey navigation.
4. Five programmable vertical line keys (left of display): Each key paired with tri-color LED status indicator (green idle, orange ringing, red active/held). Keys configurable for multi-DN extensions, BLF presence, speed dial, call park, intercom, and other unified communications features; multi-call-per-line functionality allows multiple concurrent calls per line key.
5. Dedicated fixed function hard keys (bottom UI bank):
   • Applications: One-touch access to XML enterprise apps, phone settings, wallpapers, display preferences
   • Messages: Direct portal to voicemail server, visual MWI notification trigger
   • Directory: Instant LDAP corporate contact lookup, local personal phonebook
   • Hold/Resume, Transfer, Conference: Core calling feature shortcuts
   • Speakerphone, Mute: Audio path selection controls with status LEDs
   • Volume rocker: Independent adjustment for handset receiver, ringer alert, speakerphone audio
   • Redial, End Call: Quick call termination and last-number redial
6. Ergonomic handset & cord: HAC hearing-aid compatible acoustic handset with coiled replaceable cord; handset LED strip provides visual incoming call ringing and unread voicemail MWI alerts when resting in cradleCisco.

3. Wideband Audio Subsystem & Supported Codecs

• Handset Receiver: Wideband acoustic driver with adaptive background noise suppression, TTY/TDD teletype device compatibility for accessibility complianceCisco.
• Full-Duplex Speakerphone: Built-in omnidirectional microphone with advanced digital acoustic echo cancellation and ambient noise reduction, optimized for small-group desktop conference calls.
• Headset Interface: Standard RJ-9 modular wired headset port on rear chassis; certified for Cisco and third-party office wired headsets (Bluetooth wireless headsets unsupported)Cisco.
• Supported VoIP Audio Codecs (SCCP / MPP SIP firmware): Wideband HD Voice: G.722 (16kHz sampling) Narrowband: G.711a-law, G.711u-law, G.729a low-bitrate compression codec
• Audio Optimization Features: Voice Activity Detection (VAD), Comfort Noise Generation (CNG), silence suppression, adaptive echo cancellation, dynamic automatic gain control, packet loss concealment to mitigate audio stuttering on lossy office LAN links.

Network, Power & Rear Chassis Hardware Interfaces

1. Dual Gigabit Ethernet Integrated Switch Subsystem

• Dual independent auto-sensing Gigabit RJ45 ports (10/100/1000 Mbps full/half duplex):
  1. Network Uplink Port: Connects to corporate LAN access switch, supports IEEE 802.3af Class 2 PoE power delivery
  2. PC Passthrough Port: Secondary LAN output for direct connection to end-user desktop PC or laptop, eliminating the need for a separate wall Ethernet jack at each workstation
• Supported Network & QoS Standards: IPv4 only (no IPv6), Cisco Discovery Protocol (CDP), LLDP-PoE, 802.1Q voice VLAN tagging, 802.1p Layer 2 QoS traffic prioritization, DSCP differentiated services marking for voice media packets, STUN NAT traversal for remote worker deployments, SNTP synchronized network time, TFTP/HTTP/HTTPS zero-touch auto-provisioning for bulk fleet deploymentsCisco.

2. Power Supply Architecture (Two Power Deployment Options)

1. Primary Power: IEEE 802.3af Class 2 PoE (Standard Deployment)Power drawn over the uplink Ethernet cable from compliant PoE LAN switches; Class 2 power rating minimizes power consumption (~3.84W maximum draw), reducing switch power budget overhead for large office phone fleets. Fully compatible with both 802.3af and 802.3at PoE switch hardware via CDP/LLDP power negotiationCisco Russ....
2. Secondary Power: Optional External 48V DC Power Cube 4 AC AdapterFor non-PoE network environments where PoE-capable switches are unavailable; power cube sold separately as an accessory (not included with base CP-8811-K9 unit).

• Power Efficiency: Cisco EnergyWise energy management framework support, automatically reducing LCD backlight brightness and entering low-power idle mode during off-hours to cut office electricity consumption and carbon footprint; Energy Star certified power efficiency ratingCisco.

3. Rear Chassis Hardware Interface Layout

1. Gigabit Ethernet Network Uplink RJ45 Port (PoE capable)
2. Gigabit Ethernet PC Passthrough RJ45 Port
3. RJ-9 Modular Wired Headset Port
4. Handset Coiled Cord Modular Jack
5. DC Power Input Barrel Jack (for optional external 48V power cube)
6. Kensington Physical Security Lock Slot
7. Wall-mount bracket mounting point screw holes
8. Chassis ventilation passive cooling slots (no internal fan)

Core Telephony, UC & Enterprise Feature Set

All calling features provisioned centrally via CUCM (SCCP firmware) or third-party SIP PBX/UCaaS platforms (MPP multi-platform SIP firmware); local end-user customizable settings accessible via the phone’s on-device menu system without administrator intervention.

1. Multi-Line Multi-Call Call Handling Supports up to 5 independent directory number (DN) line appearances, multi-call-per-line functionality allowing multiple concurrent active/incoming calls per line key. Standard enterprise calling functions: blind/supervised consultative call transfer, three-way ad-hoc audio conference calling, call hold/resume, one-touch mute, call park, directed/group call pickup, all-condition call forwarding (unconditional / busy line / no-answer timeout), Caller ID name/number display for all inbound ringing calls, automatic last-number redial, pre-dial number editing before call initiation, intercom auto-answer for internal department peer communications. Supplementary advanced features: MLPP multilevel precedence and preemption, barge/cbarge intrude, meet-me conference bridges, malicious caller ID logging, speed dial shortcuts mapped to line keys.
2. Directory & Call History Productivity Features Wireless LAN network access to centralized LDAP corporate employee directory servers with real-time search functionality via the LCD screen; local persistent flash memory storage for three distinct call log categories: all dialed outgoing calls, all received answered incoming calls, all missed/unanswered ringing calls. All log entries store full Caller ID metadata, precise call timestamps and total call duration data, with one-touch callback capability for every logged entry. Local personal address book storage for custom user speed dial contacts, reverse number lookup for unknown inbound callersCisco.
3. Voicemail Message Waiting Indicator (MWI) Integration Native SCCP/SIP MWI notification synchronization with Cisco Unity / Unity Connection voicemail servers or third-party hosted voice mail platforms; persistent visual MWI alert banners displayed prominently on the LCD screen, plus illuminated handset LED strip notification when unheard voicemail messages exist. Dedicated Messages hard key provides instant portal access to voicemail message playback, message deletion and personalized voicemail greeting configuration.
4. User-Customizable Local Device Settings Multiple pre-built user operation profiles enabling instant one-touch switching of ringtone sets, ring volume alert levels, notification tone schemes, vibrate alert mode activation, LCD backlight timeout durations, and audio volume presets optimized for different workplace environments (quiet private offices, open-plan busy workspaces). End users can adjust display contrast, font size, screen wallpaper backgrounds, keypad lock PIN security codes, LDAP directory search filter preferences, and local audio settings directly via the on-device menu system without CUCM/PBX administrator privileges. Full accessibility configuration menu including voice feedback navigation, adjustable audio pitch, TTY/TDD teletype support, and HAC handset audio tuning for hearing-impaired usersCisco.
5. Enterprise-Grade Security Feature Suite End-to-end encrypted voice communications stack: TLS transport layer encryption for all SCCP/SIP call setup, control and configuration signaling traffic between the phone and CUCM/SIP PBX server; SRTP AES encrypted RTP wideband/narrowband voice media data streams to prevent unauthorized wireless LAN packet sniffing and confidential corporate voice conversation interception. CAPF certificate authority proxy automatic device certificate provisioning for TLS/SRTP security enforcement; all local device configuration files, stored wireless authentication credentials and contact directory data stored encrypted at rest in internal flash memory to prevent sensitive credential exposure if the handset is physically compromised. Dual-tier access restriction architecture: administrator-level locked network provisioning and CUCM registration configuration menus (protected by admin PIN code, editable only by enterprise IT staff), and end-user-accessible local device setting menus configurable by mobile workers without administrator credentials. Password-locked factory reset function prevents unauthorized full device configuration erasure if the phone is lost or stolen, requiring the administrator PIN code to execute a complete factory default wipeCisco.
6. XML Extensible Markup Language Enterprise Application Support The grayscale LCD screen renders custom XML enterprise web applications hosted on corporate internal TFTP/HTTP/HTTPS servers, enabling office workers to access real-time business data directly on their desk phone without a separate PC or tablet device. Supported XML use cases: staff shift schedules, building facility contact lists, corporate cafeteria menus, real-time inventory lookup, hospital patient care directories, campus maintenance work order dashboards and internal company announcement feeds. Cisco Compatible Extensions (CCX) compliance ensures standardized XML application interoperability across Cisco enterprise unified communications infrastructureCisco.

Remote Device Management & Centralized Administration Tools

1. Zero-Touch Centralized TFTP Auto-Provisioning & Unattended Firmware Upgrades Fully automated remote bulk device configuration deployment and firmware image upgrade management via standard TFTP/HTTP/HTTPS server infrastructure integrated with CUCM or third-party SIP PBX platforms. The CP-8811-K9 automatically retrieves its unique device configuration file, network VLAN profiles, LDAP directory server addresses, XML application definitions and latest firmware version upon every power-on boot cycle without manual on-site IT intervention. Two interchangeable firmware load variants supported via centralized upgrade workflows: SCCP firmware for CUCM on-premises deployments, and Multiplatform Phone (MPP) SIP firmware for Webex Calling and third-party hosted SIP PBX environmentsCisco.
2. Centralized Enterprise Device Real-Time Monitoring & Call Session Audit Logging Full device real-time status tracking available within the CUCM administrative management console or third-party SIP PBX management dashboards, including desk phone online/offline registration state, active line call status, LAN switch access point association information, PoE power draw metrics, remaining flash memory storage capacity, installed firmware version number, and historical call session audit logging for complete enterprise voice communications traceability and troubleshooting. Built-in on-device network diagnostic tools include LAN wired signal strength scanning and ping utility testing to validate office LAN connectivity and CUCM/SIP PBX server reachability for on-site IT troubleshooting teams. An embedded local HTTPS web server on the phone enables remote off-site access to device status statistics and read-only configuration data for centralized monitoring without physical on-site access to the desk phone unit.
3. Mass Fleet Configuration & Troubleshooting Utilities Centralized bulk configuration export/import functionality for consistent standardized phone settings deployment across hundreds or thousands of office desk phone fleets; remote packet capture diagnostic tool for capturing local LAN voice media and signaling packets to diagnose audio quality and registration connectivity issues; problem reporting tool (PRT) for generating standardized device diagnostic log bundles to submit to Cisco TAC technical support for hardware/firmware fault resolutionCisco.

Environmental & Regulatory Compliance Certifications

• Electromagnetic Interference Compliance: FCC Part 15 Class B, CE EMC Directive, AS/NZS CISPR22 Class B, ICES-003 Class B, VCCI Class B
• Electrical Safety Certifications: UL / C-UL 60950 Second Edition, EN 60950 Second Edition (A11 amendment), IEC 60950 Second Edition, CSA C22.2 No. 60950, AS/NZS 60950, GB4943 China national electrical safety standard
• Telecommunications Regulatory Approvals: FCC Part 68 telephony terminal device certification, TIA 810A HAC hearing-aid compatibility standard
• Material Compliance: Lead-free construction materials, RoHS hazardous substance compliance for commercial enterprise worldwide deployments, post-consumer recycled plastic chassis construction for circular economy sustainability compliance
• Lifecycle Status: Actively supported enterprise product (not EOL as of 2026); Cisco continues to release periodic critical security vulnerability and severe bug-fix maintenance firmware updates; limited new feature firmware development prioritized for upper-tier 8800-series models.
• Standard Warranty: One-year limited Cisco hardware warranty covering manufacturing defects in the desk phone chassis, handset, coiled cord and internal electronic components, valid for commercial enterprise worldwide deployments.

Key Specification Bullet Points

• Model Number: Cisco CP-8811-K9 (Charcoal Gray Chassis)
• Alternate White Bezel Variant: CP-8811-W-K9
• Device Type: Enterprise Gigabit SIP/SCCP Unified VoIP Desk Phone (8800 Series Entry Model)
• Supported Telephony Firmware Protocols:
  1. SCCP (Skinny Client Control Protocol): Native CUCM on-premises deployment
  2. MPP Multiplatform SIP: Webex Calling, Broadsoft, Third-Party Hosted SIP PBX
• Display: 5-inch Backlit Grayscale Widescreen LCD, Native 800 × 480 Resolution, Adjustable Backlight Timeout Power-Saving Modes, XML Enterprise Application Rendering Support
• Line & Programmable Key Layout: 5 Independent Directory Number Line Keys (Tri-Color LED Status Indicators), 4 Context-Sensitive Softkeys, Five-Way Navigation Cluster with Central Select Button, Dedicated Fixed-Function UC Hard Keys (Messages, Directory, Applications, Hold, Transfer, Conference, Speakerphone, Mute, Volume, Redial, End Call)
• Audio Subsystem: Wideband G.722 HD Voice Support, Full-Duplex Digital Echo-Canceling Desktop Speakerphone, HAC Hearing-Aid Compatible Handset, TTY/TDD Teletype Accessibility Support, RJ-9 Modular Wired Headset Port (Bluetooth Wireless Headset Unsupported)
• Ethernet Network Interfaces: Dual Independent 10/100/1000 Mbps Gigabit RJ45 Ports (LAN Uplink PoE Capable + PC Passthrough Secondary Port), Auto-Sensing Full/Half Duplex
• PoE Power Specification: IEEE 802.3af Class 2 PoE (Primary Power Source), Compatible with 802.3af / 802.3at PoE LAN Switches via CDP/LLDP-PoE Power Negotiation
• Secondary Power Option: Optional Separate 48V DC Power Cube 4 AC Adapter (Not Included Standard with CP-8811-K9 Unit)
• Power Efficiency: Cisco EnergyWise Energy Management Framework, Energy Star Certified Low-Power Idle Mode
• Physical Mounting Options: Standard Desktop Adjustable Tilt Base Stand, Optional Separate Wall-Mount Conversion Bracket Accessory Sold Separately
• Physical Security: Integrated Kensington Anti-Theft Lock Slot on Rear Chassis
• Supported QoS & Networking Standards: IPv4 Only, CDP, LLDP-PoE, 802.1Q Voice VLAN Tagging, 802.1p Layer 2 QoS Prioritization, DSCP Differentiated Services Marking, STUN NAT Traversal, SNTP Network Time Synchronization, TFTP/HTTP/HTTPS Zero-Touch Auto-Provisioning & Bulk Firmware Upgrades
• Enterprise Security Features: TLS Encrypted SCCP/SIP Call Signaling, SRTP AES Encrypted Wideband/Narrowband Voice Media Streams, CAPF Automatic Device Certificate Provisioning, Encrypted Local Stored Credentials & Configuration Data, Dual-Tier Admin/User PIN Access Restrictions, Password-Locked Factory Reset Function
• Core Unified Communications Call Features: Up to 5 Independent DN Line Appearances, Multi-Call-Per-Line with Call Waiting, Blind/Consultative Call Transfer, Three-Way Wideband Audio Conference, Hold/Resume, One-Touch Mute, Call Park, Directed/Group Call Pickup, All-Condition Call Forward (Unconditional/Busy/No Answer), Caller ID Name/Number Display, Auto Redial, Pre-Dial Number Editing, Intercom Auto-Answer, 8 Custom Speed-Dial Hotkeys, MLPP Multilevel Precedence & Preemption, Barge/CBarge Intrusive Call, Meet-Me Conference Bridges, Malicious Caller ID Logging
• Productivity & Directory Features: Network LDAP Corporate Employee Directory Real-Time Search, Local Persistent Flash Memory Call Log Storage (Dialed Outgoing / Received Answered / Missed Incoming Calls), One-Touch Voicemail MWI Access Portal, Multiple Customizable User Ringtone/Alert Profiles, Keypad Lock PIN Security, XML Custom Enterprise Business Application Rendering (CCX Compliant)
• Centralized Management & Admin Tools: TFTP Zero-Touch Auto-Provisioning & Remote Bulk Firmware Upgrades, CUCM / SIP PBX Central Real-Time Device Status Monitoring & Call Session Syslog Audit Logging, On-Board LAN Ping & Wireless Site Survey Diagnostic Utilities, Embedded Local HTTPS Web Administration Server, Remote Packet Capture Diagnostic Tool, PRT Problem Reporting Log Generation Utility
• Target Deployment Scenarios: Mainstream enterprise office knowledge workers, small-to-medium business (SMB) open-plan and private office deployments, distributed branch office fleets, organizations running Cisco CUCM on-premises unified communications infrastructure, Webex Calling cloud UC subscribers, third-party hosted SIP PBX platforms (Broadsoft), network environments standardized on IEEE 802.3af Class 2 PoE LAN switches, IT teams prioritizing cost-effective entry-level business VoIP desk phones without premium color display or Bluetooth headset functionality
• Lifecycle Status: Actively Supported Commercial Enterprise Hardware, Regular Critical Security & Bug-Fix Maintenance Firmware Releases Available
• Standard Warranty: One-Year Limited Cisco Worldwide Commercial Enterprise Hardware Warranty

Model Quick Reference

The Cisco CP-8811-K9 is the entry-level cost-optimized desk phone within Cisco’s 8800 Series Unified IP Phone portfolio, built for mainstream office knowledge workers and SMB enterprise deployments. Its core distinguishing hardware characteristics separate it from higher-tier 8800-series models (CP-8841, 8845, 8861): grayscale monochrome LCD screen (no color TFT display), absence of built-in Bluetooth radio for wireless headset pairing, IEEE 802.3af Class 2 low-power PoE rating, and an entry-level feature set focused exclusively on core business calling functions without premium video conferencing or wireless peripheral support.

Unlike Cisco’s older 7900-series wired desk phones, the 8811-K9 delivers dual Gigabit Ethernet passthrough, wideband G.722 HD audio, dual-firmware SCCP/SIP deployment flexibility (supporting both on-prem CUCM and cloud Webex Calling / third-party SIP PBX platforms), modern enterprise security encryption (TLS/SRTP), Cisco EnergyWise power efficiency, and XML enterprise application extensibility for custom business workflow integrations.

Primary deployment value proposition: Delivers full enterprise-class Cisco VoIP unified communications feature parity with premium 8800-series desk phones at a reduced hardware cost for mass fleet deployments of standard office workers, compatible with standardized IEEE 802.3af PoE corporate LAN infrastructures, centrally manageable via zero-touch TFTP auto-provisioning, and engineered with sustainable recycled plastic construction for enterprise environmental compliance programs.

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