Cisco DP-9811-K9 (Cisco Desk Phone 9811) Complete English Datasheet

Listing Header

Cisco DP-9811-K9 Desk Phone 9811 Entry-Level Enterprise Multiplatform IP Desk Phone, 2 Physical Backlit Line Keys, 2.6-inch 256×132 Grayscale Non-Backlit LCD Display, Unified Cisco PhoneOS Cross-Platform Firmware, Dual 10/100BASE-T Fast Ethernet Integrated Switch, IEEE 802.3af Class 2 PoE Powered, No Bluetooth, No USB Peripheral Ports, No KEM Key Expansion Module Support, Native Triple Platform Support for CUCM SCCP, Webex Calling, BroadWorks Multiplatform SIP, Cost-Effective Base Model of Cisco Modern 9800 Desk Phone Series, Designed for Basic Standard Office Users, Hot-Desking Workstations, Low-Volume Reception Overflow & Auxiliary Call Center Secondary Stations

Full Product Overview

The Cisco Desk Phone 9811, part number DP-9811-K9, is the entry-level base model of Cisco’s new-generation 9800 Series enterprise desk IP phone portfolio, built on the unified cross-platform Cisco PhoneOS operating system released in late 2025Cisco. Optimized for cost-sensitive mass deployments of standard office workers with simple dual-line calling requirements, the 9811 strips out all premium auxiliary hardware to deliver core enterprise voice functionality at the lowest price point in the 9800 lineup.

Core Differentiators vs Higher-Tier 9800 Series Phones (9841/9851/9861/9871)

1. Only 2 physical backlit line keys (9841=4 lines, 9851=6 lines, 9861/9871=10 touchscreen lines) for basic single/dual-line user deploymentsWebex Help...
2. Small compact 2.6-inch static grayscale non-backlit LCD screen (9841=3.5-inch backlit grayscale; 9851=3.7-inch color backlit; 9861=5-inch color backlit; 9871=5-inch color touchscreen)Cisco
3. Zero built-in Bluetooth wireless radio module (only 9841/9851/9861/9871 standard variants include Bluetooth headset pairing hardware)Webex
4. No USB-A / USB-C peripheral ports (all upper-tier 9800 models carry at minimum one USB port for headsets, keyboards or expansion modules)Webex Help...
5. Hardware incompatible with Cisco 9800 Series Color Key Expansion Modules (KEM); only 9851/9861/9871 support external BLF key expansion panelsWebex Help...
6. Simplified 2-way directional navigation pad (premium models feature 4-way navigation clusters with dedicated calendar/application shortcut hard keys)
7. No embedded Wi-Fi wireless radio hardware (only 9861/9871 offer Wi-Fi connectivity for cable-free hot-desking deployments)Webex

Primary Enterprise Deployment Use Cases

• Standard non-specialized corporate office employees with simple single/dual-line calling workflows
• Shared hot-desking open-plan office hubs, flexible temporary contractor workstations
• Auxiliary call center agent secondary backup stations, low-volume reception overflow desks
• Mixed unified communications deployment environments: on-premises Cisco Unified Communications Manager (CUCM) SCCP, Cisco Webex Calling cloud UCaaS, BroadWorks third-party hosted SIP PBX platformsWebex

Hardware & Physical Mechanical Specifications

Form Factor & Physical Construction

• Chassis Type: Compact fixed desktop desk phone with integrated analog handset, full backlit tactile hard key dial pad, single-position adjustable desktop foot stand, Kensington anti-theft lock slot on rear panel
• Casing Material: Matte charcoal grey or optional Arctic white reinforced scratch-resistant ABS polycarbonate, latex-free, RoHS compliant recyclable low-carbon construction materials
• Standard Unit Total Weight (Handset Included): 954 grams (2.10 lb)
• Overall External Physical Dimensions (H × W × D, excluding desktop stand): 214 × 214 × 49.4 mm (8.4 × 8.4 × 1.9 inches)

Operating Environmental Parameters

• Working Ambient Temperature Range: 0°C to +50°C (32°F ~ 122°F)
• Nonoperating Storage Temperature Range: -25°C to +70°C (-13°F ~ 158°F)
• Relative Humidity Tolerance: 10% – 95% non-condensing atmospheric humidity
• Maximum Operational Altitude: Up to 3000 meters above sea level

Global Compliance Certifications

ADA American Disabilities Act accessibility standards, MIL-STD-810G office drop-shock testing; full suite of global EMC/RF safety certifications including FCC Part 15 Class B, CE EMC 2014/30/EU, AS/NZS CISPR22, ICES-003, VCCI Class B; global electrical safety UL/CSA/EN/IEC 60950, 62368-1; telephony certifications FCC Part 68, TIA HAC hearing-aid compatibility, TIA-920 wideband HD voice standard; RoHS lead-free hazardous substance compliance.

Front Panel UI, Display & Hard Key Layout

2.6-inch Grayscale Static LCD Display

• Screen Hardware Specs: 2.6-inch diagonal widescreen TFT LCD panel, native resolution 256 × 132, no built-in backlight illumination, no ambient light sensor, fixed static non-touch panel with basic text-only UI rendering
• Display Rendering Functions: Mono-color enterprise caller ID, synchronized LDAP corporate directory text search results, basic local call history text archives, simple home screen communication status widgets (active call state, voicemail MWI alert text banners, meeting reminder text notifications)

Dedicated Physical Hard Key Control Panel

Lower front chassis fixed tactile backlit hard keys for core collaboration control operationsCisco:

1. Core universal call function dedicated shortcut keys: Hold / Resume, Transfer, Redial, Three-Way Conference
2. Unified vertical volume rocker switch: Single adjustment control for analog handset receiver audio, integrated internal desktop loudspeaker output volume, and incoming ringtone / meeting alert audio levels
3. 2-Way directional navigation pad with center Select confirmation button (no dedicated Calendar / Application shortcut keys present on higher-tier models)
4. Global Mute, Speakerphone Toggle, Headset Mode Toggle, End Call / Hang-Up dedicated hard keys
5. Full backlit 12-key numeric alphanumeric dial pad (0–9, *, #) for manual enterprise extension dialing, voicemail navigation, and free-form text input for enterprise applications
6. Dedicated Action Button (programmable custom user shortcut key for speed dial, feature activation)
7. Directory dedicated hard key for one-touch LDAP corporate directory lookup access
8. Front Arc multi-state LED indicator strip for global call, voicemail and desk hot-desking status alerts

Rear Panel Peripheral & Network Interfaces

1. Dual independent 10/100BASE-T Fast Ethernet RJ45 integrated switch ports: Primary uplink port to corporate access switch; secondary PC passthrough port for direct laptop/desktop wired LAN connection
2. DC Power Input Barrel Jack (optional external AC-DC power adapter, PoE primary power source supported)
3. Modular coiled analog handset connection port
4. Kensington anti-theft security lock slot

• No USB ports, no Bluetooth radio module, no HDMI interfaces, no expansion module connection ports (9811 hardware does not support peripheral expansion or wireless Bluetooth headset pairing)

Audio Subsystem, Voice Codec Support

Audio Hardware Components

1. Analog Handset Receiver: Wideband acoustic driver with adaptive background noise suppression, fully HAC hearing-aid compatible magnetic coupling design compliant with ADA accessibility requirements
2. Full-Duplex Integrated Desktop Loudspeaker: Omnidirectional single-element internal microphone array paired with internal desktop loudspeaker driver; integrated hardware digital signal processing (DSP) featuring Acoustic Echo Cancellation (AEC), Background Gain Normalization (BGN), and Automatic Gain Control (AGC) algorithms optimized for quiet single-user private office environmentsCisco

• Microphone frequency response range: 100 Hz – 20 kHz
• Speaker frequency response range: 70 Hz – 20 kHz

3. Audio I/O Connection Options
4. Standard modular coiled analog handset interface port
5. 3.5mm stereo audio jack for external headsets and auxiliary audio playback devices (EHS electronic hookswitch remote call answer/end control support)
6. No Bluetooth wireless radio hardware, no USB peripheral ports for USB enterprise headset connection

Supported VoIP Wideband & Narrowband Audio Codecs (Unified Dual SCCP/SIP Single-Image PhoneOS Firmware)

Wideband HD Voice Codecs: G.722 (16kHz sampling rate, TIA 920 wideband compliance), iSAC adaptive wideband compression codec, OPUS adaptive wideband codec Narrowband Codecs: G.711 a-law, G.711 u-law, G.729a low-bitrate compression codec, G.729ab comfort noise optimized narrowband codec, iLBC narrowband voice codec

Audio Optimization Feature Suite

Voice Activity Detection (VAD), Comfort Noise Generation (CNG), silence suppression, adaptive full-duplex echo cancellation, intelligent packet loss concealment to eliminate audio stuttering over lossy wired enterprise network connections, active lip synchronization algorithm for natural real-time voice call audio sync, acoustic shock protection for handset/headset audio safety.

Wired Network Connectivity Specifications

Dual 10/100BASE-T Fast Ethernet Integrated Switch

Two series-connected RJ45 Fast Ethernet LAN ports:

1. Primary LAN Uplink Port: Connect to corporate enterprise access switch, fully compatible with IEEE 802.1Q VLAN tagging to isolate voice/media traffic between the 9811 phone and connected downstream PC
2. Secondary Downstream PC Passthrough Port: Enables direct wired LAN access for a desktop PC/laptop without requiring an additional wall Ethernet wall jack in office workspaces

Supported Network Protocols & QoS Standards

• Layer 2 Discovery & Power Management: Cisco Discovery Protocol (CDP), LLDP-MED endpoint device discovery, LLDP-PoE power negotiation
• Traffic Prioritization & Segmentation: IEEE 802.1p Layer 2 CoS marking, IEEE 802.1Q tagged VLAN segmentation for voice/media traffic isolation from corporate data networks
• Signaling & Provisioning Protocols: TFTP zero-touch auto-provisioning for firmware, device configuration files, and enterprise Android application deployment; SCCP Skinny Client Control Protocol (native CUCM integration); SIP Session Initiation Protocol (third-party hosted PBX compatible)
• NAT Traversal Mechanisms: STUN, TURN, ICE NAT traversal protocols for remote worker off-site SIP voice call connectivity across corporate firewalls and NAT gateways

Power Supply Architecture

Two independent power input modes for flexible corporate office switch infrastructure compatibility:

1. Primary Power Source: IEEE 802.3af Class 2 PoE power drawn from primary LAN uplink Ethernet port (48 VDC nominal input voltage). Class 2 PoE power budget fully supports continuous operation of backlit LCD screen, internal loudspeaker/microphone array, and all core telephony hardware without auxiliary AC power adapters.
2. Secondary Backup Power Option: Optional external 48V DC wall-mount AC power cube adapter (accessory SKU CP-PWR-CUBE-3=), universal global mains input voltage range 100–240 VAC, 50 / 60 Hz alternating current for all regional worldwide office deployments

• Power Efficiency Compliance: Cisco EnergyWise intelligent power management framework full support; configurable automatic deep-sleep low-power idle mode activation during off-hours non-business periods to reduce corporate facility electrical energy consumption

Core Telephony, PhoneOS Unified Communications & Global Enterprise Feature Set

The DP-9811-K9 runs a unified dual-protocol SCCP/SIP PhoneOS telephony layer, supporting three distinct enterprise UC deployment architectures without firmware reflash required to switch operating modes:

1. SCCP Skinny Client Control Protocol: Native registration and full feature-compatible integration with on-premises Cisco Unified Communications Manager (CUCM) and CUCM Business Edition versions 12.5(1) and newer releasesWebex
2. MPP Multiplatform SIP Firmware: Cloud UCaaS hosted voice deployments including BroadWorks third-party service provider PBX platforms
3. Webex Calling Native SIP Cloud Service: Cisco Webex Calling cloud collaboration services native multi-platform SIP registration

All core device configuration parameters, wired LAN security VLAN profiles, LDAP corporate directory server addresses, XML enterprise workflow application definitions, and unified PhoneOS firmware images are automatically downloaded via TFTP zero-touch auto-provisioning workflows upon every power-on boot cycle, eliminating manual local device configuration setup by end users.

1. Multi-Line Multi-Call Enterprise Voice Telephony

Supports up to 2 independent directory number (DN) line registrations, multi-call-per-line support allowing multiple concurrent active/incoming calls per line, native call waiting alert notifications for new inbound calls during active conversations. Full standard enterprise call handling functions: supervised consultative call transfer, blind unsupervised transfer, three-way ad-hoc audio conference calling, call hold/resume, one-touch global microphone mute, call park, directed / group call pickup, all-condition conditional call forwarding (unconditional / busy line / no-answer timeout), Do Not Disturb (DND) mode, full-color Caller ID name and number display for all ringing inbound calls, automatic last-number redial, pre-dial extension number editing before call initiation, intercom auto-answer for internal cross-department peer communications across multi-region global campus enterprise networks. Advanced supplementary telephony features include MLPP multilevel precedence and preemption priority call routing, barge / cbarge intrusive call monitoring, meet-me conference bridge support, malicious caller ID logging, fully customizable touchscreen soft-key speed dial shortcut layout editor configurable by end users.

2. Unified Local & Network Directory, Call Log Productivity Tools

Dual synchronized contact directory architecture combining network cloud corporate directory and local persistent device storage:

1. Network LDAPv3 global enterprise employee directory servers, real-time multi-language wildcard search functionality accessible via the 2.6-inch grayscale LCD display
2. Local on-device flash memory persistent storage for personal private address book entries, custom speed dial shortcuts, and permanent call history log archives

Three categorized persistent call log databases stored locally: all dialed outgoing audio calls, fully answered received inbound calls, missed unanswered ringing inbound calls. Each log entry stores complete Caller ID metadata, synchronized cross-campus precise call timestamps, full call duration metrics, with single-touch one-click callback functionality for every log entry. Local personal address book supports custom conference bridge access speed dial numbers, internal cross-region corporate extension contacts, reverse number lookup resolution for unknown anonymous inbound caller IDs.

3. Voicemail MWI (Message Waiting Indicator) Synchronization

Native SCCP/SIP MWI notification synchronization with Cisco Unity / Unity Connection voicemail servers and third-party hosted voice mail platforms for global multi-region campus enterprise deployments. Persistent visual MWI alert banners permanently displayed on the 9811 main LCD screen home dashboard, plus steady illuminated amber handset LED status indicator light to notify users of unlistened voicemail messages. Dedicated Messages application one-touch shortcut provides instant direct portal access for voicemail audio playback, message deletion management and personalized custom voicemail greeting recording and configuration.

4. User-Customizable Local Device Settings & Complete Accessibility Support

Multiple pre-configured user operation environment profiles allowing single-touch quick switching between custom ringtone sets, ring volume alert levels, notification tone schemes, LCD screen backlight auto-off timeout durations and audio volume presets optimized for different workplace environments (quiet private executive offices, noisy open-plan manufacturing floors, medium-traffic retail and reception workspaces). End users may independently adjust display contrast, system font size, screen wallpaper backgrounds, device security PIN keypad lock codes, LDAP corporate directory search filter preferences, Bluetooth device pairing/unpairing management (Bluetooth hardware not present on 9811), Wi-Fi wireless network SSID connection profile editing (Wi-Fi hardware absent), USB peripheral power management (no USB ports), external auxiliary audio I/O gain adjustment, local audio DSP noise cancellation strength adjustment directly via the LCD touchscreen graphical menu system without CUCM/PBX administrator privileges. Complete enterprise accessibility configuration menu suite including voice feedback screen navigation, adjustable audio pitch control, TTY/TDD teletype machine support, and HAC handset audio tuning optimization for hearing-impaired users.

5. XML Custom Enterprise Workflow Application Rendering

The 2.6-inch grayscale capacitive LCD display fully renders custom XML enterprise web applications hosted on internal corporate global TFTP/HTTP/HTTPS servers. End users access real-time business operational data directly from the 9811 desktop IP phone without requiring separate laptop, PC or tablet hardware. Supported XML enterprise workflow use cases: cross-region hospital patient ward real-time status dashboards, manufacturing production line operation monitoring panels, multi-building campus emergency contact lists, cross-border company multi-language internal announcement feeds, multi-site conference bridge access code reference lists, healthcare patient care team cross-region contact directories, facility maintenance global work order tracking dashboards and real-time manufacturing multi-site production line status dashboards. Full Cisco Compatible Extensions (CCX) compliance guarantees standardized XML application interoperability across all Cisco global enterprise unified communications infrastructure deployments.

Centralized Remote Device Management & Global IT Administration Tools

1. Zero-Touch TFTP Auto-Provisioning & Remote Bulk Global Unified PhoneOS Firmware Upgrades Fully automated remote mass device configuration deployment and unified cross-platform single-image firmware upgrade management via standard TFTP/HTTP/HTTPS server infrastructure integrated with CUCM, Webex Calling and BroadWorks global PBX platforms. The DP-9811-K9 desktop IP phone automatically retrieves its unique device configuration file, wired LAN VLAN security profiles, LDAP multi-region corporate directory server addresses, XML enterprise workflow application definitions and latest unified PhoneOS firmware image on every power-on boot cycle, eliminating manual on-site IT technician configuration intervention for global enterprise device fleets spread across EMEA, APAC, Latin America and North America. One single universal unified firmware load natively supports both CUCM SCCP on-premises deployment mode and BroadWorks / Webex SIP cloud hosted PBX mode without separate firmware reflash operations required to switch UC deployment platforms, a core architectural distinction separating the 9811 PhoneOS entry-level model from legacy multi-firmware wireless handset models.
2. Real-Time Global Device Status Monitoring & Call Session Audit Logging Comprehensive live real-time 9811 device status tracking accessible via the CUCM administrative management console or third-party BroadWorks SIP PBX global cloud management dashboards. Monitored real-time device metrics include: wired LAN online/offline registration state, active multi-line audio call session status, access point wired LAN switch port association information, PoE power draw consumption metric, installed unified PhoneOS firmware full version identifier, attached downstream PC passthrough Ethernet connection status, and permanent historical cross-campus audio conference call session audit logging for complete enterprise voice communications traceability and global IT troubleshooting workflows. Built-in on-device network diagnostic utility suite includes wired LAN link signal strength measurement, and continuous ICMP ping test functionality to validate campus wired LAN network connectivity and CUCM/SIP PBX server reachability for on-site regional IT support teams. An embedded local HTTPS web administration server integrated within the 9811 hardware enables remote off-site cross-region global IT staff to access real-time device operational status statistics and read-only device configuration data for centralized fleet monitoring without physical on-site access to the desktop IP phone unit hardware.
3. Mass Global Fleet Configuration Export/Import & Advanced Troubleshooting Utilities Centralized bulk device configuration file export/import functionality for consistent standardized enterprise device setting deployment across hundreds or thousands of global distributed 9811 desktop IP phone fleets deployed worldwide across all international geographic regions; remote wired packet capture diagnostic tool for recording local campus LAN voice/media audio and call signaling data packets to diagnose audio quality degradation and cross-campus device registration connectivity failure issues; integrated PRT Problem Reporting Tool utility to generate standardized compressed device full diagnostic log bundle archives that can be submitted directly to Cisco Global TAC Technical Support engineering teams for hardware/firmware fault resolution and technical case escalation workflows.

Regulatory Compliance, Lifecycle Status & Standard Hardware Warranty

Global Certification Compliance Summary

• Electromagnetic Interference Compliance: FCC Part 15 Class B, CE EMC Directive 2014/30/EU, AS/NZS CISPR22 Class B, ICES-003 Class B, VCCI Class B, KN22 Class B, CNS13438 Class B
• Global Electrical Safety Certifications: UL / C-UL 60950 Second Edition, UL / C-UL 62368-1, EN 60950 Second Edition (A11/A12 amendments), EN 62368, IEC 60950 Second Edition, CSA C22.2 No. 60950, CSA C22.2 No. 62368-1, AS/NZS 60950, GB4943 China national electrical safety standard
• Telephony Terminal Approvals: FCC Part 68 telephony device certification, TIA 810A HAC hearing-aid compatibility standard, TIA 920 wideband HD voice audio compliance
• Material Environmental Compliance: Full lead-free construction materials, RoHS hazardous substance restriction compliance for worldwide commercial enterprise deployments

Product Lifecycle Status

End-of-Sale (EoS) entry-level 9800 Series desktop IP phone product line; Cisco has permanently ceased new original manufacturing production runs for DP-9811-K9. Only limited refurbished, used surplus inventory is available through third-party resellers globally. Cisco continues to release periodic critical security vulnerability patch updates and severe software bug-fix maintenance unified PhoneOS firmware releases for customers holding valid active Cisco support service contracts per official Cisco global product support lifecycle policy guidelines.

Standard Global Hardware Warranty

One-year limited Cisco worldwide commercial enterprise hardware warranty coverage valid across all global international geographic regions. Warranty covers manufacturing defects in all integrated 9811 hardware components including chassis frame, 2.6-inch grayscale LCD display panel, internal audio DSP processing hardware, dual Fast Ethernet integrated switch controller modules, analog handset audio receiver hardware and all internal printed circuit board electronic components. Warranty coverage excludes physical accidental damage, liquid spill damage, scratch surface cosmetic wear, unauthorized third-party hardware modification, improper non-Cisco external power adapter usage and normal daily operational wear and tear from regular office workplace use.

Core Specification Quick Reference Bullet Points

• Model Part Number: Cisco DP-9811-K9 (Cisco Desk Phone 9811 Entry-Level Enterprise Dual-Line IP Desk Phone, 9800 Series Portfolio)
• Product Family: Legacy Cisco 9800 Series Unified Communications Enterprise Desk IP Phones (PhoneOS Cross-Platform Firmware)
• Device Form Factor: Compact Fixed Desktop Desk Phone with Integrated Analog Handset, No Bluetooth Radio Module, No USB Peripheral Ports, No KEM Expansion Module Support, No Wi-Fi Wireless Hardware, PoE Primary Power Input (IEEE 802.3af Class 2)
• CPU & Firmware Architecture: Custom Embedded Telephony Processor, Unified Cross-Platform PhoneOS Single-Image Firmware (SCCP CUCM / SIP BroadWorks / Webex Calling Multiplatform Triple Protocol Support)
• Display Specs: 2.6-inch Diagonal Grayscale Static TFT LCD, Native Resolution 256 × 132, No Built-In Backlight, Non-Touch Static Mono Text Display Panel
• Physical Line Keys: 2 Backlit Dedicated Directory Number Line Keys (Max 2 Simultaneous DN Registrations)
• Dedicated Fixed Hard Key Layout: Hold, Transfer, Redial, Three-Way Conference, Mute, Speakerphone Toggle, Headset Mode Toggle, End Call, Vertical Volume Rocker Switch, 2-Way Directional Navigation Pad with Center Select Button, Action Programmable Shortcut Key, Directory Corporate Lookup Hard Key, Full Backlit 12-Key Numeric Alphanumeric Dial Pad
• Audio Subsystem Key Features: G.722 Wideband HD Voice Support, Multi-Band Background Noise Cancellation DSP, Full-Duplex Digital Echo-Canceling Integrated Desktop Single-Element Loudspeaker Array, Single Internal Digital Microphone, HAC Hearing-Aid Compatible Analog Handset Receiver, TTY/TDD Teletype Accessibility Support, 3.5mm Stereo Wired Headset Jack (EHS Electronic Hookswitch Remote Call Control Compatible), No Bluetooth Wireless Headset Pairing Hardware, No USB Peripheral Ports For USB Enterprise Headset Connectivity
• Wired Network Connectivity Hardware: Dual Independent 10/100BASE-T Fast Ethernet RJ45 Integrated Switch Ports (Primary Uplink Port, Secondary Downstream PC Passthrough LAN Port), PoE Not Supported For Wi-Fi / USB Peripherals (No Wi-Fi/USB Hardware Present On 9811)
• Wireless Connectivity Hardware: No Embedded Wi-Fi Radio Module, No Bluetooth 2.1 EDR Wireless Radio Hardware
• Peripheral Expansion Interfaces: Zero USB-A / USB-C Peripheral Ports, No HDMI Input/Output Interfaces, No Serial Diagnostic Ports, No External Color Key Expansion Module (KEM) Connection Hardware
• Power Input Mode: IEEE 802.3af Class 2 PoE Power Over Ethernet Primary Power Source; Optional Separate Cisco 48V DC AC-DC External Power Adapter (Sold Separately as Accessory SKU CP-PWR-CUBE-3=), Universal Global 100–240VAC Mains Input Compatibility
• Physical Mounting Options: Single-Position Adjustable Desktop Foot Stand; Optional VESA Wall Mount Conversion Bracket Accessory (Sold Separately)
• Supported QoS & Enterprise Network Standards: IPv4 Only, CDP Cisco Discovery Protocol, LLDP-MED Endpoint Discovery, IEEE 802.1Q Tagged Voice VLAN Segmentation, IEEE 802.1p Layer 2 CoS Traffic Prioritization, DSCP Differentiated Services Voice/Media Packet Marking, STUN / TURN / ICE NAT Traversal For Remote Off-Site Worker Connectivity, SNTP Synchronized Global Network Time Protocol, TFTP/HTTP/HTTPS Zero-Touch Auto-Provisioning & Bulk Global Unified PhoneOS Firmware Remote Upgrades
• Enterprise Communications Security Features: TLS Encrypted SCCP/SIP Call Signaling Transport, SRTP AES Encrypted Wideband/Narrowband Voice Media Streams, Secure Boot Firmware Integrity Validation, SHA-256 Cryptographic Certificate Validation, SCEP Automatic Digital Certificate Enrollment For Enterprise 802.1X Wired LAN Security, Full Local On-Device Encrypted Stored Credentials & Device Configuration Data, Dual-Tier Admin/User PIN Access Restrictions, Password-Locked Factory Reset Function to Prevent Unauthorized Device Data Wiping
• Core Unified Communications Global Voice Call Feature Set: Up To 2 Independent DN Logical Directory Number Identities, Multi-Call-Per-Line with Call Waiting, Blind/Consultative Call Transfer, Three-Way Wideband Audio Conference Bridge, Call Hold/Resume, One-Touch Global Microphone Mute, Call Park, Directed/Group Call Pickup, All-Condition Call Forward Rules (Unconditional/Busy/No Answer), DND Do Not Disturb Operating Mode, Full-Color Caller ID Name & Number Global Display, Automatic Last Number Redial, Pre-Dial Extension Number Editing Before Call Initiation, Intercom Auto-Answer for Internal Cross-Department Peer Communications, Fully Customizable LCD Soft-Key Speed-Dial Shortcut Layout Editor, MLPP Multilevel Precedence & Preemption Priority Call Routing, Barge/CBarge Intrusive Supervisor Call Monitoring, Meet-Me Multi-Party Conference Bridges, Malicious Caller ID Logging, Multiple Customizable User Ringtone & Notification Alert Profiles, Keypad Lock PIN Security Protection, CCX Cisco Compatible Extensions XML Custom Enterprise Global Business Application Rendering Support
• Exclusive 9811 Entry-Level Differentiator Features vs Higher-Tier 9841 / 9851 / 9861 / 9871 Models: Only 2 Physical Backlit Line Keys (Premium Models 4/6/10 Lines); Compact Smaller 2.6-inch Static Grayscale LCD Display (9861 5-inch Larger Screen, 9871 Touchscreen Panel); Zero USB Peripheral Ports (All Higher-Tier Models Include At Minimum One USB-A / USB-C Port); No Embedded Bluetooth Wireless Radio Module (Only 9861 / 9871 Support Bluetooth Headset Pairing); No Hardware Compatibility With External 9800 Series Color Key Expansion Modules (KEM); Simplified 2-Way Directional Navigation Pad (Premium Models Feature 4-Way Navigation Clusters With Dedicated Calendar/Application Shortcut Hard Keys); No Wi-Fi Wireless Radio Hardware (All Higher-Tier Models Support Optional Wi-Fi Radio Modules); No HDMI Input/Output Peripheral Interfaces; Limited Class 2 PoE Power Budget Without Support For External Peripheral Device Power Draw
• Productivity & Unified Collaboration Feature Suite: Network LDAPv3 Multi-Language Global Corporate Employee Directory Real-Time Wildcard Search, Local Persistent Flash Memory Long-Term Call Log Storage (Dialed Outgoing / Received Answered / Missed Incoming Global Campus Voice Conference Calls), No Bluetooth Mobile Smartphone Contact List Synchronization Hardware, Native Preloaded Cisco Unified Communications Manager (UCM) Device Application Suite, Unified WebEx Cloud-Synchronized Cross-Device Contact & Call History Logs, One-Touch Voicemail MWI Access Portal for Message Playback & Greeting Configuration
• Centralized Global IT Administration & Remote Management Tools: TFTP Zero-Touch Auto-Provisioning & Remote Bulk Global Unified PhoneOS Firmware Upgrades, CUCM / WebEx Control Hub / BroadWorks SIP PBX Central Real-Time Device Status Monitoring & Call Session Syslog Global Audit Logging, On-Board Wired LAN Ping Diagnostic Utility, Embedded Local HTTPS Web Administration Server, Remote Wired Packet Capture Diagnostic Tool, PRT Problem Reporting Log Generation Utility for Cisco TAC Technical Support Escalation
• Global Target Enterprise Deployment Scenarios: Standard Non-Specialized Corporate Office Employees With Simple Single/Dual-Line Calling Requirements, Shared Hot-Desking Open-Plan Office Hubs, Flexible Temporary Worker Workstations, Auxiliary Call Center Agent Secondary Backup Stations, Low-Volume Reception Overflow Desks Deployed Across EMEA, APAC, Latin America and North America; distributed multi-region campus 9811 desk IP phone fleets, organizations running CUCM on-premises unified communications infrastructure, BroadWorks hosted SIP PBX global cloud platforms, Cisco Webex Calling cloud UCaaS subscribers, wired dual Fast Ethernet enterprise access switch network infrastructures, global IT teams prioritizing cost-effective entry-level basic enterprise voice desk IP phones without advanced Bluetooth, USB peripheral expansion, Wi-Fi wireless connectivity, touchscreen display or multi-line BLF key module support, unified cross-platform single-image SCCP/SIP dual-protocol PhoneOS firmware eliminating separate CUCM/cloud SIP firmware reflashing administrative overhead, full ADA accessibility compliance for regulated public sector, education and healthcare enterprise deployments, robust enterprise TLS/AES encrypted audio media communications security for worldwide cross-border corporate campus office workstations operating in standard fixed wired office desktop environments requiring basic entry-level enterprise voice calling desk IP phones with core standard telephony feature set and simplified cost-optimized hardware design without premium peripheral expansion or wireless communication extras.
• Lifecycle Status: End-of-Sale (EoS) Legacy 9800 Series Unified Communications Entry-Level Enterprise Desk IP Phone Hardware, No New Original Production Manufacturing Stock Available, Limited Refurbished / Surplus Inventory Only; Actively Supported Critical Security Patch & Bug-Fix Maintenance Unified PhoneOS Firmware Release Schedule Maintained Per Official Cisco Global Product Support Lifecycle Policy
• Standard Global Hardware Warranty: One-Year Limited Cisco Worldwide Commercial Enterprise Hardware Warranty Valid Across All Global International Geographic Regions