Cisco CP-6841-3PCC-K9 Full English Product Description

Listing Title

Cisco CP-6841-3PCC-K9 IP Phone 6841 Multiplatform (3PCC) 4-Line Business VoIP Desk Phone, 3.5-inch 396×162 Backlit Grayscale LCD Display with XML Application Support, Dual 10/100/1000BASE-T Gigabit Switched Ethernet Ports with PC Pass-Through, IEEE 802.3af Class 2 PoE Supported, Full-Duplex HD Wideband Echo-Canceling Speakerphone, Dedicated RJ-9 Wideband Headset Port, Open Standard SIP MPP Third-Party Call Control (3PCC) Firmware, SRTP/TLS Encrypted Secure Voice Media & Signaling, Desktop and Wall Mountable, Discontinued End-of-Sale Legacy SMB VoIP Endpoint, Ideal for Office Managers, Administrative Staff, Retail Supervisors, Mid-Volume Multi-Line Business Voice and Remote Worker DeploymentsCisco

Full Commercial Overview

The Cisco CP-6841-3PCC-K9 is a mid-tier four-line multiplatform (MPP) VoIP desk phone within Cisco’s IP Phone 6800 Series product portfolio. The suffix3PCCstands for Third-Party Call Control, meaning this unit runs pure open-standard SIP firmware, independent of Cisco CUCM enterprise call manager; it delivers full interoperability with Webex Calling, Broadworks, Asterisk, hosted UCaaS platforms and all industry-standard SIP PBX systemsCisco.

Designed for mid-volume office users such as administrative assistants, department managers and retail supervisors, the CP-6841 supports four independent SIP line registrations with multi-call-per-line appearance functionality, enabling users to handle multiple concurrent calls, shared line monitoring and BLF extension status tracking. Compared to the entry-level 2-line CP-6821 model, the 6841 upgrades to Gigabit Ethernet ports, a larger high-resolution 3.5-inch grayscale LCD screen and enhanced multi-line capacity for heavier daily call workloadsCisco.

The entire Cisco 6841 MPP series reached End-of-Sale (EoS) on July 12, 2024, classified as discontinued legacy collaboration hardware, succeeded by modern Cisco Webex IP phone product linesCisco. All device provisioning, dial plan configuration, unattended bulk firmware upgrades and remote diagnostics are supported via TFTP, HTTP and HTTPS secure auto-provisioning. Users can complete all basic local configuration adjustments directly through the backlit graphical LCD menu navigation without a PC web portal, and the display supports customizable XML enterprise applications for corporate directories, internal announcements and custom workflow toolsCisco.

Hardware, Display & Audio Architecture

1. Four Independent Programmable SIP Line Buttons

Four physical illuminated line keys on the left side of the display support up to four unique SIP registrations. Each line key supports multiple simultaneous call appearances (call waiting, hold, shared line monitoring, BLF busy lamp field extension status), with color-coded LED status indicators: solid green for idle line, solid red for active/held calls, flashing red for incoming ringing callsCisco.

2. Graphical LCD Display & Physical Control Layout

• Display Panel: 3.5-inch (9cm) backlit grayscale LCD screen with 396 × 162 pixel high resolution. The screen renders caller ID name/number, real-time call duration timestamps, local call history logs, system menu navigation prompts, network time/date, XML corporate application content and status icons for active headset, mute and DND modes.
• Hard Key Layout & Navigation: Standard 12-key tactile numeric dial pad; dedicated fixed-function illuminated hard keys: Mute, Headset, Speakerphone, Volume Toggle, Central Four-Way Navigation Cluster with Select Button, Directory, Applications, Hold, Transfer, Conference and three context-sensitive LCD softkeys for dynamic call control functionsCisco.
• LED Status Indicators: Backlight status LEDs on all line and function keys; dedicated vertical red Message Waiting Indicator (MWI) LED integrated on the handset cradle to notify users of unheard voicemail messages (solid red = new voicemail, flashing red = incoming call)Cisco.

3. Complete Wideband HD Audio Subsystem

• Ergonomic wired analog handset with noise isolation and native G.722 HD wideband voice support, connected via a standard RJ-9 modular port.
• Built-in full-duplex hands-free speakerphone with advanced acoustic echo cancellation, supporting simultaneous talk-and-listen conference-style calling without audio cut-off; automatic DTMF tone privacy masking during speakerphone operation.
• Dedicated RJ-9 wideband headset audio port fully compatible with Cisco 500 Series wired headsets and mainstream industry-standard office headsets.
• Supported Voice Codecs: G.711 A-law / µ-law, G.726, G.729A/B/AB, G.722 HD wideband voice, G.722.2, iSAC, ILBC, OPUS wideband audio codecsCisco.
• Audio Optimization Technologies: Adaptive dynamic jitter buffer, Voice Activity Detection (VAD) silence suppression, Comfort Noise Generation (CNG); DTMF signaling transmitted via in-band audio or RFC 2833 out-of-band SIP INFO signaling.

4. Chassis & Mounting Specifications

Compact matte charcoal gray ABS plastic desktop chassis with a removable single-position foldable rear foot stand for stable desk or countertop placement. The foot stand can be fully detached to enable wall mounting, with pre-drilled standardized mounting holes located on the rear panel of the phone.

• Physical Dimensions (excluding foot stand, handset and cabling): 225 × 210 × 36 mm
• Unit Weight (including foot stand, excluding handset): 545 g

Network, Power & Hardware Interfaces

1. Dual Switched 10/100/1000BASE-T Gigabit Ethernet RJ45 Ports

Two auto-sensing Gigabit Fast Ethernet ports with an integrated mini network switch, a core deployment advantage for office workstations with attached desktop PCs, laptops or POS terminalsCisco:

• Primary WAN Port: Connects the IP phone directly to corporate LAN switches, VoIP gateways or SIP PBX appliances for SIP control signaling and RTP voice media traffic.
• Secondary PC Pass-Through Port: Enables direct connection of downstream Ethernet devices to the corporate network through the phone, eliminating the requirement for extra wall-mounted network jacks and cutting office cabling infrastructure costs.

Supported networking standards: Full IPv4 RFC compliance suite, DHCP client for automatic IP addressing, DNS SRV record lookup, ARP, ICMP, TCP/UDP, RTP/RTCP voice media quality reporting, Layer 2 802.1p QoS traffic marking, voice VLAN tagging, STUN NAT traversal for remote/home office NAT network environments, SNTP network time synchronization, CDP and LLDP network device discovery protocols.

2. Dual Power Supply Options

1. Native IEEE 802.3af Class 2 PoE Support (Primary Deployment Method): The phone draws electrical power directly from PoE-enabled network switches via Ethernet cabling, eliminating separate AC power adapters for standard office workstation deployments.
2. Auxiliary AC Power Supply Backup: Optional country-specific universal AC-to-DC power adapter (Cisco 6800 series power cube, sold separately), rated for 100–240 VAC 50/60Hz input, output 5V DC / 2.0A for phone operation in non-PoE network environmentsCisco.

3. Additional Physical Interfaces

• RJ-9 modular wired handset connector
• Dedicated RJ-9 wideband headset audio jack
• Recessed pinhole password-protected factory reset button for restoring default device configurations.

Core Business Telephony Feature Set

All calling functions can be configured via auto-provisioning templates, on-device LCD menu or triggered via standard SIP star feature access codes:

1. Four-Line Multi-Call Handling: Multi-call-per-line appearance support, per-line call waiting, call hold, music-on-hold, attended & blind call transfer, local three-way ad-hoc audio conferencing, call swap between active lines, automatic last number redial, on-hook dialing, global Do Not Disturb (DND) mode to suppress incoming ring alerts, call park and unpark functionality, shared line appearance monitoring and BLF extension busy lamp field status tracking.
2. Caller ID & Personalization: Caller ID name and number display on LCD, outbound caller ID blocking, anonymous call rejection, customizable distinctive ringtones per line, programmable speed dial assignments and local stored personal phone directory with BLF extension monitoring support.
3. Utility & Group Calling Features: One-touch intercom calling with auto-answer speakerphone mode, selective and group call pickup, call back on busy, system broadcast paging support.
4. Local Call Log Storage: Onboard storage for dialed, received and missed call records with timestamps and call duration data, fully viewable on the phone’s LCD screen.
5. Voicemail Integration: Native MWI voicemail notification via SIP SUBSCRIBE/NOTIFY messaging, dedicated one-touch Messages hard key for instant voicemail retrieval.

Security & Remote Management Capabilities

1. Voice & Signaling Encryption: SRTP secure AES encryption for VoIP voice media streams, TLS encrypted SIP control signaling to prevent network call eavesdropping and malicious signaling interception.
2. Multi-Tier Device Access Security: Separate administrator and end-user permission levels protected by unique passwords; password-locked factory reset function to block unauthorized full configuration erasure.
3. Automated Provisioning & System Monitoring: Secure unattended remote firmware upgrades without interrupting active voice calls, centralized syslog event logging, built-in network diagnostic tools for IT administrators and small business telecom service providers; customizable XML enterprise application support for corporate directories and internal business services.

Environmental & Regulatory Specifications

• Regulatory Compliance Certifications: FCC Part 15 Class B electromagnetic interference compliance, UL / C-UL electrical safety certification, CE marking for European Union market compliance, A-Tick Australian telecommunications certification, HAC hearing aid compatibility certification.
• Operating Environment: Indoor use only Operating Temperature: 0°C ~ +40°C (32°F ~ 104°F) Storage Temperature: -20°C ~ +70°C (-13°F ~ 158°F) Operating Humidity: 10% – 90% non-condensing Storage Humidity: 10% – 95% non-condensing
• Memory Architecture: Onboard flash memory for persistent firmware and configuration storage, dedicated SDRAM runtime memory for real-time multi-line call processing and LCD menu operation.
• Lifecycle Status: Discontinued End-of-Sale legacy MPP multi-platform VoIP hardware, no active Cisco firmware development support after EoS date.
• Warranty: Standard one-year limited Cisco hardware warranty for commercial business end-user deployments.

Key Specification Bullet Points

• Model Number: Cisco CP-6841-3PCC-K9
• Device Type: Multiplatform 4-Line Open SIP VoIP Desk IP Phone (3PCC Third-Party Call Control MPP Firmware)
• Supported Telephony Protocols: Industry Standard SIP v2 (RFC 3261 Suite), MPP Multiplatform Firmware for third-party PBX / UCaaS compatibility
• Supported Voice Codecs: G.711 A/µ, G.726, G.729A/B/AB, G.722 HD Wideband Voice, G.722.2, iSAC, ILBC, OPUS
• Display: 3.5-inch backlit grayscale LCD screen, 396 × 162 pixel resolution, XML corporate application support
• Physical Buttons & Indicators: 4 programmable illuminated line keys, 12-key numeric dial pad, dedicated illuminated hard keys for Mute, Headset, Speakerphone, Volume, Navigation Cluster, Directory, Applications, Hold, Transfer, Conference; standalone red handset cradle MWI voicemail waiting LED
• Physical Audio Interfaces: RJ-9 handset port, dedicated RJ-9 wideband headset jack, built-in full-duplex echo-canceling HD speakerphone, HAC hearing-aid compatible handset
• Ethernet Interfaces: Dual auto-sensing 10/100/1000BASE-T Gigabit switched LAN ports (WAN uplink + PC pass-through secondary port)
• Power: Native IEEE 802.3af Class 2 PoE support; Optional separate 5V DC AC power adapter sold individually
• Mounting Method: Removable foldable desktop foot stand as standard; wall-mount capable via rear chassis mounting holes
• Supported QoS & Networking: 802.1p Layer 2 QoS marking, voice VLAN tagging, DHCP client, STUN NAT traversal, SNTP time sync, CDP/LLDP network discovery
• Security Features: TLS encrypted SIP signaling, SRTP AES encrypted voice media, dual-level admin/user password lock, HTTPS embedded web management, password-protected factory reset
• Core Call Features: 4-line multi-call-per-line concurrent call support, call waiting, hold, attended/blind transfer, three-way conference, BLF extension busy lamp field monitoring, caller ID blocking, anonymous call rejection, intercom, group call pickup, speed dial, LCD-accessible local call logs, DND silent mode, voicemail MWI notification, call park/unpark, shared line appearance
• Management Tools: Embedded web admin interface, local LCD menu configuration, TFTP/HTTP/HTTPS auto remote provisioning, syslog event logging, unattended remote in-service firmware upgrades, customizable XML enterprise application support
• Deployment Scenarios: Mid-sized business office manager desks, administrative staff workstations, retail supervisor counters, multi-line medium call-volume office deployments, remote home office telephony setups, third-party SIP PBX / Webex Calling / Broadworks UCaaS environments
• Lifecycle Status: Discontinued End-of-Sale legacy MPP IP phone, EoS effective July 12, 2024
• Warranty: One-year limited Cisco hardware warranty

Model Quick Reference

• CP-6841-3PCC-K9 is the mid-tier 4-line multi-platform open SIP phone of Cisco 6800 MPP Series; the "3PCC" suffix denotes third-party open SIP firmware, fully separate from CUCM-locked SCCP enterprise variants.
• Core positioning: Mid-capacity business VoIP endpoint built exclusively for open SIP PBX and hosted UCaaS platforms, offering four SIP registrations, Gigabit Ethernet and a larger high-resolution LCD screen, upgrading from the entry-level 2-line CP-6821.
• Primary deployment advantage: Dual Gigabit switched Ethernet ports eliminate redundant wall network jacks for combined PC + phone workstation setups, while native IEEE 802.3af PoE reduces separate power adapter cabling costs for mass office rollouts.
• Series internal comparison: CP-6821 (2-line entry) < CP-6841 (4-line mid-tier) < CP-6851 (4-line + KEM expansion support) < CP-6861 (4-line + Wi-Fi) < CP-6871 (6-line color display).