Cisco CP-3905-K9 Full English Description

Listing Title

Cisco CP-3905-K9 Unified SIP Phone 3905 Charcoal Single-Line Entry-Level Enterprise VoIP IP Telephone, Cost-Effective Basic Business Voice Communications Handset, 128×32 Monochrome LCD Display, Dual 10/100BASE-T RJ45 Ethernet Ports, IEEE 802.3af Class 1 PoE Powered, Full-Duplex Wideband Speakerphone, Ergonomic Dedicated Call Control Keys, SIP Protocol Support, Multi-Language UI, Compact Wall-Mountable Chassis, Limited Hardware Warranty, Ideal for Office Cubicles, Retail Stores, Classrooms, Warehouse Production Floors and Public Hallway Basic Voice Deployments

Full Commercial Product Description

The Cisco CP-3905-K9 (Unified SIP Phone 3905) is an entry-level, budget-friendly single-line enterprise SIP IP phone engineered for organizations requiring reliable, simplified day-to-day voice communications without advanced multi-line or video features. Built with a durable compact charcoal plastic chassis, this VoIP handset delivers core business telephony functionality, optimized for light-to-moderate voice usage scenarios including office cubicles, retail point-of-sale stations, school classrooms, manufacturing production floors, break rooms and public facility hallways.

All device provisioning, call configuration, firmware updates and centralized management operate via standard SIP protocol, fully compatible with Cisco Unified Communications Manager, Cisco Webex Calling and third-party SIP-based PBX platforms. Zero-touch provisioning (ZTP) auto-registers the phone to corporate UC systems upon initial network connection, eliminating manual local configuration for mass enterprise deployments.

Core Hardware & Audio Architecture

1. Single-Line Operation: Dedicated support for one primary active voice line, designed for users with minimal concurrent call handling demands.
2. Monochrome LCD Screen: 128×32 pixel backlit monochrome display that renders caller ID information, active call status, call history logs, device menu settings and softkey navigation prompts. The screen supports dozens of global display languages for multi-regional enterprise sitesCisco.
3. Wideband Full-Duplex Audio System:
   • Standard ergonomic charcoal wired handset with wideband HD voice audio for clear natural voice transmission and reception.
   • Built-in full-duplex hands-free speakerphone, enabling conference-style calls without holding the handset, with independent volume adjustment controls.
   • Integrated microphone mute button, separate dedicated volume rocker keys for handset, speakerphone and ringtone audio levels.
   • Voice Activity Detection (VAD) and Comfort Noise Generation (CNG) to optimize VoIP bandwidth consumption during silent call periods.
4. Physical Keypad & Function Buttons: Standard 0–9 numeric dial pad with tactile keys, plus dedicated shortcut buttons for core call workflows: Call Hold, Call Transfer, Three-Way Conference, Navigation Select Key, Softkey Navigation Arrows, Mute, Speakerphone and Volume Control.

Network & Power Subsystem

The CP-3905-K9 integrates an embedded 10/100BASE-T fast Ethernet switch with dual RJ45 LAN ports to simplify office cabling infrastructure:

• Primary LAN RJ45 port: Connects the IP phone to corporate network switches for SIP signaling and VoIP media traffic.
• Secondary PC pass-through RJ45 port: Allows direct connection of a desktop PC or laptop to the corporate network via the phone’s Ethernet link, removing the need for separate wall network jacks for each workstation.

Power delivery supports two deployment options:

1. IEEE 802.3af Class 1 PoE (Power over Ethernet): Primary power method, drawing electrical power directly from the connected network switch over the Ethernet cable, eliminating separate AC power adapters and messy desk power cabling.
2. Auxiliary 12V DC Local Power Supply: Optional separate AC-to-DC power adapter (sold separately, not included in standard CP-3905-K9 packaging) for non-PoE network environments.

Internal memory specifications include 4MB flash storage for firmware and configuration files, plus 32MB SDRAM runtime memory for call processing and UI operations.

Enterprise Call & Security Feature Set

1. Core Call Handling Functions: Inbound call waiting, call hold, blind/attended call transfer, three-way ad-hoc audio conferencing, caller ID display, incoming call ringtone selection, local missed/received/dialed call history logs, speed dial entry storage, and do-not-disturb (DND) mode to suppress incoming ring alerts.
2. Unified Security Controls: Secure SIP TLS signaling encryption, SRTP encrypted VoIP media streams to prevent call eavesdropping, local administrative device password lock, authenticated firmware upgrades, and 802.1X network port authentication for corporate LAN access control.
3. Cloud & On-Premises UC Integration: Natively interoperable with Cisco Unified CM, Cisco Webex Calling, Cisco Business Edition UC appliances, and third-party standard SIP PBX systems. Centralized bulk device firmware upgrades, global dial plan deployment and remote phone configuration management via unified communications dashboards.

Physical & Environmental Construction

The compact low-profile charcoal chassis supports two mounting form factors:

1. Desktop slab deployment: Foldable integrated rear stand for stable flat surface placement on office desks and counters.
2. Wall-mount deployment: Built-in rear mounting slots compatible with standard single-gang electrical wall junction boxes for hallway, retail wall and classroom fixed mounting setups.

Physical dimensions (folded slab desktop mode): 205 mm × 150 mm × 53.5 mm (8.07 × 5.91 × 2.11 inches). Total unit weight: 594.3 grams (20.96 ounces).

Operating environmental specifications: Operating temperature range -5°C to +45°C (23°F to 113°F); operating relative humidity 10% to 90% non-condensing, suitable for standard indoor office, retail and industrial indoor non-harsh environments.

Key Specification Bullet Points

• Model Part Number: CP-3905-K9 (Cisco Unified SIP Phone 3905, Charcoal Standard Handset)
• Phone Type: Single-line entry-level enterprise SIP VoIP IP Telephone
• Supported Telephony Protocol: Session Initiation Protocol (SIP)
• Display: 128×32 pixel backlit monochrome LCD multi-language UI screen
• Audio Capabilities: Wideband HD voice handset, full-duplex hands-free speakerphone, dedicated mute, independent volume controls for handset/speaker/ringtone, VAD & CNG bandwidth optimization
• Physical Controls: Numeric 0–9 keypad, dedicated hard keys for Hold, Transfer, 3-Way Conference, Mute, Speakerphone, 4-way navigation select key
• Network Interfaces: Dual auto-sensing 10/100BASE-T RJ45 Ethernet ports (LAN uplink + PC pass-through switch port)
• Power Options: IEEE 802.3af Class 1 PoE primary power; optional separate 12V DC external power adapter (not included in standard kit)
• Internal Memory: 4MB flash memory, 32MB SDRAM
• Mounting Options: Desktop foldable stand, standard single-gang wall junction box wall mount
• Physical Dimensions (slab folded): 205 × 150 × 53.5 mm (8.07 × 5.91 × 2.11 in); Unit Weight: 594.3g (20.96 oz)
• Operating Environment: Indoor use only; Operating Temp: -5°C ~ +45°C; Humidity: 10% – 90% non-condensing
• Core Call Features: Call Waiting, Call Hold, Blind/Attended Transfer, 3-Way Audio Conference, Caller ID, DND Mode, Local Call History Logs, Speed Dial Storage
• Security Features: TLS encrypted SIP signaling, SRTP encrypted voice media, 802.1X LAN authentication, admin password device lock, authenticated secure firmware updates
• UC Compatibility: Cisco Unified Communications Manager, Cisco Webex Calling, Cisco Business Edition UC platforms, all industry-standard SIP PBX systems
• Packaging Contents: CP-3905-K9 main phone base, coiled charcoal handset cord, standard charcoal handset, foldable desktop stand, Ethernet patch cable; AC power adapter sold separately
• Warranty: Cisco Limited Hardware Warranty for enterprise end-user deployments
• Typical Deployment Scenarios: Corporate office cubicles, retail store POS stations, school classrooms, manufacturing warehouse production floors, office break rooms, public facility hallways, small business basic voice telephony deployments

Model Quick Reference

• CP-3905-K9 is Cisco’s entry-level single-line SIP IP phone, positioned below multi-line models such as the CP-7800/8800 series.
• Differentiators vs high-end Cisco IP phones: Single-line only, no color touchscreen, no built-in Bluetooth/Wi-Fi, no USB ports, no multi-line expansion modules; prioritizes low cost and simplified core voice functionality for light-usage staff.
• Primary deployment advantage: PoE-powered dual-port Ethernet pass-through design eliminates redundant network wall jacks for office PC + phone deployments, reducing cabling infrastructure costs for mass rollouts.
• Suitable alternative for organizations that do not require multi-line hunt groups, video calling, wireless headsets or advanced contact center telephony features.

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