Cisco CP-7811-K9 Full English Product Description

Listing Title

Cisco CP-7811-K9 Unified Single-Line IP Desk Phone (Dual CUCM SIP / Multiplatform 3PCC Firmware), 3.28-inch Backlit Monochrome 384×106 LCD Display, Dual 10/100BASE-TX Fast Ethernet Switched Ports with PC Pass-Through, IEEE 802.3af Class 1 PoE Powered, G.722 HD Wideband Full-Duplex Echo-Canceling Speakerphone, Dedicated Hold / Transfer / Conference Fixed Hard Keys, RJ9 Analog Headset Port, HAC Hearing-Aid Compatible Handset, Low-Power Eco-Friendly Operation, Charcoal Black Matte ABS Chassis, Adjustable Desktop Stand, Wall Mountable (Wall Kit Sold Separately), Ideal for Lobbies, Break Rooms, Hotel Guest Rooms, Auxiliary Office Desks, Retail Public Areas and Low-Traffic Single-Line Business VoIP Deployments

Full Commercial Overview

The Cisco CP-7811-K9 is the entry-level single-line VoIP endpoint within Cisco IP Phone 7800 Series, engineered for cost-effective basic voice communication in low-traffic shared spaces and light-duty office positionsCisco. The platform supports dual firmware modes: native SIP operation for Cisco Unified Communications Manager (CUCM/CUCM Express), and Multiplatform (MPP) 3PCC open SIP firmware compatible with Webex Calling, BroadWorks, Zoom Phone and all third-party hosted SIP PBX systemsshoprefres....

Key design differentiators against higher-tier 7800 series models (7821/7841/7861): only one independent directory number (DN) line, no programmable BLF line keys, compact simplified keypad layout optimized for basic call handling. It retains enterprise-grade core capabilities including HD wideband audio, dual Fast Ethernet PC passthrough, secure SRTP/TLS encrypted voice signaling and media, and multi-language menu support for global deployments.

The unit features a durable textured charcoal black polycarbonate ABS chassis with recyclable construction materials, ultra-low Class 1 PoE power consumption (max 3.84W) to minimize long-term energy costs, and a multi-angle foldable desktop foot stand for ergonomic screen viewing. A wall-mount accessory kit is sold separately for vertical installation on walls or cubicle partitions.

Cisco issued an official End-of-Sale (EoS) announcement for the CP-7811 in May 2026, with the final order cutoff date set for October 28, 2026; limited critical bug and security maintenance support will continue through the published end-of-hardware lifecycle timelineCisco. All remote provisioning, mass firmware upgrades and centralized monitoring are supported via TFTP/HTTP/HTTPS auto-provisioning servers and embedded HTTPS web administration portal, fully integrated with CUCM and third-party UCaaS platforms.

Hardware & Physical Design Architecture

1. Ergonomic Chassis & Mounting Options

• Form factor: Compact low-profile desktop body equipped with an adjustable foldable foot stand delivering a 45-degree optimized LCD viewing angle. Wall mounting requires a separate optional wall-mount accessory kit, with pre-designed rear chassis cutouts for vertical installation.
• Chassis material: Textured matte black recyclable polycarbonate ABS plastic; the CP-7811-K9 model is only available in charcoal black finish (no white chassis variant)Cisco.
• Physical Dimensions (H × W × D, excluding handset): 207mm × 195mm × 33mm
• Total Unit Weight (including standard coiled handset): 806 grams
• Operating Environment (Indoor Use Only): Operating Temperature: 0°C ~ +40°C (32°F ~ 104°F) Storage Temperature: -10°C ~ +60°C (14°F ~ 140°F) Operating Humidity: 10% – 90% non-condensing Storage Humidity: 10% – 95% non-condensing

2. Key Layout, LCD Display & Control Hardware

The CP-7811 features a compact monochrome backlit LCD paired with streamlined fixed-function hard keys tailored for single-line basic call workflows, with no programmable BLF side keys:

1. Backlit monochrome LCD display: 3.28-inch screen, 384 × 106 pixel resolution, adjustable screen contrast and backlight brightness; displays Caller ID name/number, call timers, local call history logs, corporate directory entries, system menu navigation, date/time clock, line status and voicemail MWI alertsCisco Russ....
2. Single tricolor LED illuminated line key: Visual real-time line state signaling (solid green = idle line; solid red = active/held call; flashing red = incoming ringing call).
3. Three dedicated one-touch fixed function hard keys: Hold, Transfer, Conference for instant call control without multi-layer menu navigation.
4. Standard 12-key tactile numeric dial pad (0–9, *, #) with high-contrast backlit keys for low-light visibility.
5. Three context-sensitive softkeys positioned directly below the LCD screen, dynamically mapped to on-screen menu options.
6. Central five-way directional navigation rocker with integrated select button for scrolling contact directories, call logs and device configuration menus.
7. Auxiliary dedicated hard keys: Mute, Headset, Volume Up/Down rocker, Redial, End Call, Messages, Applications, Directory shortcut keys.
8. Vertical red Message Waiting Indicator (MWI) LED on the top chassis edge to notify users of unheard voicemail messages.

3. HD Wideband Audio Subsystem & Supported Codecs

• Ergonomic analog coiled handset with noise-isolating receiver, certified HAC (Hearing-Aid Compatible) to meet global accessibility standards for users wearing hearing assistive devices.
• Built-in full-duplex echo-canceling hands-free speakerphone optimized for HD wideband voice clarity, with automatic DTMF tone masking during speakerphone operation for call privacy.
• Dedicated RJ9 modular analog headset port supporting all standard wired office headsets.
• Supported voice audio encode/decode codecs: G.722 HD wideband audio, G.711a / G.711u narrowband, G.729a, iLBC low-bitrate codec.
• Voice quality optimization features: Voice Activity Detection (VAD), Comfort Noise Generation (CNG) to eliminate artificial silent line background noise during idle call periods.

Network, Power & Hardware Interfaces

1. Dual 10/100BASE-TX Fast Ethernet Switched RJ45 Ports

Two auto-sensing Fast Ethernet ports with integrated mini internal network switch, enabling seamless daisy-chaining of desktop PCs without additional wall-mounted network jacks:

• Primary WAN Network Port: Connects the IP phone to corporate LAN switches, VoIP gateways or SIP PBX servers for SIP call control signaling and RTP voice media data streams.
• Secondary PC Pass-Through Port: Provides direct wired network connectivity for attached laptops, desktop workstations or POS terminals routed through the phone’s integrated switch.

Supported networking standards: IPv4 addressing only (DHCP dynamic IP assignment or static manual IP configuration), Cisco Discovery Protocol (CDP), LLDP-MED device discovery, 802.1Q voice VLAN tagging, 802.1p Layer 2 QoS traffic prioritization, STUN NAT traversal for remote worker deployments, SNTP network time synchronization.

2. Dual Power Supply Options (Class 1 PoE Primary Power)

1. Native IEEE 802.3af Class 1 Power over Ethernet support (primary power source): Maximum typical power consumption: Only 3.84 watts for ultra-low idle energy draw, configurable screen backlight timeout to further reduce power usage during off-hours. Input rating: 48V DC PoE power input from all compliant IEEE 802.3af PoE network switches.
2. Optional auxiliary external 48V DC universal AC-to-DC power cube (part number CP-PWR-CUBE-3=, sold separately) for non-PoE network environments lacking PoE-enabled switches.

3. Rear Panel Physical Interfaces

1. RJ9 modular handset jack for connecting the coiled handset cord
2. Dual RJ45 10/100 Fast Ethernet PoE switched ports (Network uplink + PC pass-through)
3. RJ9 analog headset audio jack
4. DC 48V auxiliary power input jack for optional external power adapter
5. Recessed pinhole password-protected factory reset button to restore all device firmware and configuration settings to factory default values

Core Telephony Feature Set

All calling and device configuration functions are provisioned via CUCM / third-party SIP PBX auto-provisioning templates; routine call operations are triggered via dedicated physical hard keys or LCD softkey menu navigation:

1. Single-Line Multi-Call Handling Supports one independent directory number (DN) line registration with multi-call-per-line appearance, allowing multiple concurrent active calls on the single line plus native call waiting functionality. Dedicated Hold key for call park, dedicated Transfer and Conference hard keys for one-touch consultative transfer and three-way ad-hoc audio conference calls. Supports call swap between multiple active calls, automatic last-number redial via dedicated Redial key.
2. Caller ID & Personalization Features Visual Caller ID name and number display on the backlit LCD screen; adjustable ringtone volume and multiple selectable distinct ringtone tones, customizable unique ring alert patterns for incoming internal vs external calls. On-device local directory storage with search functionality, plus XML framework support for corporate LDAP enterprise directory lookup and XML hosted application rendering.
3. Utility Workplace Calling Functions One-touch redial, mute hard key for confidential private conversations, dedicated headset mode toggle, shared line appearance monitoring support for multi-user shared lobby/guest room lines, call forward all/busy/no answer, call park and call pickup functionality, intercom auto-answer calling for internal facility staff communication.
4. Local Call Log Storage Onboard persistent flash memory storage for dialed outgoing calls, received answered calls and missed incoming calls, complete with timestamp, call duration and full Caller ID details; all logs fully viewable directly on the phone’s LCD screen or embedded web management portal.
5. Voicemail MWI Integration Native Message Waiting Indicator (MWI) notification delivered via SIP/SCCP SUBSCRIBE/NOTIFY messaging; steady red chassis MWI LED illumination plus on-screen LCD pop-up visual alerts to notify users of unheard voicemail messages, with dedicated Messages shortcut key for one-touch voicemail retrieval.
6. Supported Security Call Features Anonymous incoming call rejection, outbound caller ID blocking configurable via PBX/server-side settings, end-to-end encrypted SIP/SCCP call control signaling (TLS 1.2) and encrypted voice media streams (SRTP AES encryption) for secure communications on shared corporate LAN networks.

Security & Remote Device Management Capabilities

1. End-to-End Encrypted Voice & Signaling Communications TLS transport layer encryption for all SCCP/SIP call setup and control signaling; SRTP AES encrypted RTP voice media data streams to prevent unauthorized wireless or wired call audio interception on shared office network infrastructures.
2. Multi-Tier Access Permission Controls Separate administrator and end-user access privilege levels protected by unique alphanumeric authentication passwords; password-locked factory reset function to block unauthorized wiping of device line registrations, directory contacts and configuration data.
3. Centralized Auto-Provisioning & Unattended Firmware Upgrades Fully unattended remote bulk firmware upgrades pushed via TFTP/HTTP/HTTPS secure auto-provisioning servers, fully compatible with CUCM, CUCM Express and third-party SIP/UCaaS platforms including Webex Calling, BroadWorks and Zoom Phone. Embedded HTTPS web-based local administration portal for on-site device configuration and real-time status monitoring.
4. System Monitoring & Built-In Network Diagnostics Real-time device status tracking available via CUCM / third-party SIP PBX management consoles, including online/offline LAN connectivity status, SIP/SCCP line registration state, active call session auditing and centralized syslog event logging for complete network telephony audit trails; integrated built-in ping and traceroute diagnostic tools for network connectivity troubleshooting.

Environmental & Regulatory Compliance Certifications

• Regulatory EMI/EMC: FCC Part 15 Class B electromagnetic interference compliance, CE marking for European Union market compliance, AS/NZS CISPR22 Class B certification
• Safety certifications: UL / C-UL 60950 Second Edition electrical safety certification, EN 60950 Second Edition (A11/A12), IEC 60950, AS/NZS 60950, GB4943 China national safety standard
• Telecom regulatory approvals: FCC Part 68 telecom terminal device certification, TIA 810A HAC hearing aid compatibility standard
• Memory architecture: 8MB flash memory for persistent firmware, directory and configuration storage; 32MB SDRAM runtime memory for SCCP/SIP call processing, LCD screen rendering and network stack operation
• Lifecycle Status: Announced End-of-Sale (EoS) May 8, 2026, final order cutoff October 28, 2026; limited critical security/bug maintenance support only, no new feature firmware development
• Warranty: Standard one-year limited Cisco hardware warranty for commercial business end-user deployments

Key Specification Bullet Points

• Model Number: Cisco CP-7811-K9 (Charcoal Black Single-Line Unified IP Phone; No white chassis variant available)
• Device Type: Entry-Level Single-Line Unified IP VoIP Desk Phone (Dual Native CUCM SIP / MPP 3PCC Open SIP Dual Firmware), Backlit Monochrome LCD Display, Dual Switched Fast Ethernet Ports with PC Pass-Through
• Supported Telephony Protocols: SCCP (Skinny Client Control Protocol) + SIP v2 for Cisco CUCM / UCME; MPP Multiplatform 3PCC SIP v2 open standard for third-party SIP PBX / Webex Calling / Zoom Phone / BroadWorks UCaaS platforms
• Supported Voice Audio Codecs: G.722 HD Wideband Audio, G.711a / G.711u, G.729a, iLBC Low Bitrate Codec
• Display: Backlit Monochrome LCD Screen, 3.28-inch diagonal, 384 × 106 Pixel Resolution, Adjustable Contrast & Backlight Brightness, Multi-Language Menu Support
• Fixed Hardware Function Keys: Dedicated Hold, Redial, Transfer, Conference, Mute, Headset Hard Keys; Three Dynamic LCD Softkeys, Five-Way Navigation Rocker, Shortcut Keys for Messages, Applications, Directory
• Audio Features: HAC Hearing-Aid Compatible Handset Receiver, Full-Duplex Echo-Canceling HD Wideband Hands-Free Speakerphone, VAD Voice Activity Detection, CNG Comfort Noise Generation, RJ9 Analog Headset Port
• Physical Interfaces: 1 x RJ9 Handset Port, Dual 10/100BASE-TX RJ45 Fast Ethernet Switched PoE Ports (Network Uplink + PC Pass-Through), RJ9 Headset Jack, 48V DC Aux Power Input Jack, Password-Protected Factory Reset Pinhole
• Power Specifications: IEEE 802.3af Class 1 PoE Primary Power, Max Typical Power Consumption 3.84W, Configurable Backlight Timeout Energy-Saving Mode; Optional Separate 48V DC Universal AC Power Cube (CP-PWR-CUBE-3=, Sold Separately)
• Mounting Method: Adjustable foldable desktop foot stand as standard; Wall mountable via separate optional wall-mount accessory kit
• Supported QoS & Networking Features: IPv4 DHCP/Static IP Assignment, CDP/LLDP-MED Device Discovery, 802.1Q Voice VLAN Tagging, 802.1p Layer 2 QoS Prioritization, STUN NAT Traversal, SNTP Network Time Synchronization
• Security Features: TLS 1.2 Encrypted SCCP/SIP Call Signaling, SRTP AES Encrypted Voice Media Streams, Dual-Level Admin/User Password Access Control, Password-Locked Factory Reset, Embedded HTTPS Web Administration Interface
• Core Telephony Call Features: Single Independent SIP/SCCP Line Registration, Multi-Call-Per-Line Appearance, Supports Multiple Concurrent Calls + Call Waiting, Dedicated Hold / Redial / Transfer / Conference Hard Keys, Full-Duplex HD Wideband Speakerphone, Visual LCD Caller ID Display, MWI Voicemail Message Waiting LED Alert, Anonymous Call Rejection, Outbound Caller ID Blocking, Shared Line Appearance Support, Call Forward, Call Park & Call Pickup, Local Call Log Storage, XML LDAP Corporate Directory Lookup, XML Hosted Application Rendering
• Management Tools: TFTP/HTTP/HTTPS Secure Remote Auto-Provisioning, Unattended Bulk Remote Firmware Upgrades, Embedded Web-Based Local Admin Portal, CUCM / Third-Party SIP PBX Centralized Device Monitoring, Syslog Event Logging, Built-In Ping/Traceroute Network Diagnostic Tools
• Target Deployment Scenarios: Hotel and resort guest room telephony, commercial building lobby public phones, cafeteria/break room auxiliary voice lines, retail store public service counters, low-traffic auxiliary office desks, healthcare facility waiting area basic VoIP endpoints, all single-line low-volume business VoIP environments requiring cost-effective basic voice communication functionality
• Lifecycle Status: Announced End-of-Sale (EoS) May 8, 2026, final hardware order deadline October 28, 2026
• Warranty: One-year limited Cisco hardware warranty

Model Quick Reference

• CP-7811-K9 is the entry-level single-line IP phone of Cisco IP Phone 7800 Series, supporting dual CUCM SCCP/SIP and open MPP 3PCC third-party SIP firmware, purpose-built for low-traffic shared spaces and light-duty auxiliary voice deployments.
• Core positioning: Cost-optimized basic single-line business VoIP endpoint with backlit monochrome graphical LCD display, differentiated from higher-tier 7800 series models (7821/7841/7861) by only one supported line, absence of programmable BLF side keys, and simplified keypad layout focused exclusively on essential call handling functions.
• Key internal series differentiation vs other 7800 series models:
  1. CP-7811-K9: 1 single line, no BLF programmable side keys, compact simplified keypad, charcoal black chassis only
  2. CP-7821-K9: Dual independent lines, small set of BLF programmable keys, charcoal/white chassis options
  3. CP-7841-K9: Four multi-call lines, expanded BLF programmable key bank, dual-band optional upgrade support
  4. CP-7861-K9: 16-line high-capacity executive model, large multi-column BLF programmable key panel
• Primary deployment advantage: Balanced low total cost of ownership and reliable enterprise-grade voice security/HD audio quality for low-traffic single-line shared facility deployments, combining visual LCD Caller ID and directory management, dual Fast Ethernet switch eliminating extra wall jacks for attached PCs, dedicated physical Transfer/Conference hard keys to simplify basic call workflows, ultra-low Class 1 PoE power consumption for continuous 24/7 lobby/guest room operation, flexible desktop or optional wall mounting, and dual firmware compatibility supporting both on-prem CUCM and cloud third-party UCaaS voice platforms.

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