Cisco CP-7940G Full English Product Description

Listing Title

Cisco CP-7940G Unified 2-Line IP Desk Phone (Multi-Protocol SCCP / SIP / MGCP), Pixel-Based Monochrome LCD Display, Dual 10/100BASE-TX Fast Ethernet Integrated Switch Ports for PC Passthrough, Dual Power Compatibility (Legacy Cisco Pre-Standard Inline Power + IEEE 802.3af PoE), Full-Duplex Echo-Canceling Hands-Free Speakerphone, Four Dynamic LCD Softkeys, Two Programmable Tricolor BLF Line Keys, Dedicated Hold, Transfer & Conference Hard Keys, Built-In RJ9 Headset Port, HAC Hearing-Aid Compatible Handset, Charcoal ABS Chassis, Adjustable Desktop Foot Stand, Wall Mountable, Ideal for General Office Staff, Retail Supervisors, Small Business Managers and Medium-Traffic 2-Line Enterprise VoIP Deployments

Full Commercial Overview

The Cisco CP-7940G is a mid-tier 2-line multi-protocol enterprise IP phone within the original Cisco Unified IP Phone 7900 Series portfolio, designed for transactional office workers, retail supervisors and small business managers with medium daily call volumes requiring dual independent directory number support, BLF presence monitoring and integrated PC passthrough networking.

This device supports three native VoIP signaling protocols for maximum deployment flexibility: proprietary SCCP (Skinny Client Control Protocol) for Cisco Unified CallManager / CUCM on-premises deployments, open standard SIP v2 for third-party SIP PBX and Cisco Unified SRST disaster recovery fallback gateways, plus MGCP for media gateway-controlled telephony environmentsCisco.

Core Hardware & Feature Differentiators vs Other 7900 Series Models

1. Two programmable tricolor BLF line keys: Supports two independent directory numbers, multi-call handling and real-time presence monitoring for co-worker extensions, a critical upgrade over single-line CP-7911G / 7912G models.
2. Triple multi-protocol stack (SCCP/SIP/MGCP): Broader protocol compatibility than single-protocol or dual-protocol entry-level 790X variants.
3. Dual integrated 10/100 Fast Ethernet switch ports: Separate LAN uplink and PC access port to daisy-chain office cubicle desktops without extra wall network jacks.
4. True full-duplex echo-canceling hands-free speakerphone: Equipped with integrated microphone for two-way conference calls, unlike monitor-only speaker entry-level phones such as CP-7906G.
5. Built-in dedicated RJ9 headset port: Native headset support without requiring separate adapter hardware, a feature missing from low-tier single-line 7912G models.
6. Dual PoE power compatibility: Works seamlessly with both legacy Cisco pre-standard inline power and official IEEE 802.3af PoE switches, compatible with mixed-generation corporate network infrastructure.

The unit uses solid matte charcoal black ABS plastic chassis construction, a two-position adjustable foldable desktop foot stand that can be fully detached for vertical wall mounting via pre-molded rear chassis cutouts (no separate wall-mount accessory kit required).

The CP-7940G has long reached official End-of-Sale (EoS) status; limited critical security vulnerability and bug-fix maintenance support remains active, with no new feature firmware releases planned. Remote bulk provisioning, unattended mass firmware upgrades and centralized device monitoring are fully supported via TFTP auto-provisioning servers and embedded HTTPS web administration portal, fully compatible with Cisco CallManager 3.3 and later CUCM/CUCM Express releases, as well as Cisco Unified SRST fallback voice gateways.

Hardware & Physical Design Architecture

1. Compact Chassis & Mounting Options

• Form factor: Low-profile desktop body equipped with a two-position adjustable foldable foot stand for ergonomic LCD viewing angles; foot stand is fully removable for vertical wall mounting via integrated rear chassis mounting cutouts, no extra wall-mount kit required.
• Chassis material: Matte charcoal black rigid recyclable ABS plastic, scratch-resistant for daily shared office usage.
• Physical Dimensions (H × W × D, excluding handset): 203.2mm × 266.7mm × 152.4mm (8 × 10.5 × 6 inches)Cisco.
• Total Unit Weight (including standard coiled handset): Approximately 1.6 kg (3.5 lbs)Cisco.
• 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% – 95% non-condensing Storage Humidity: 10% – 95% non-condensing

2. Key Layout, LCD Display & Control Hardware

The CP-7940G integrates a large pixel-based monochrome LCD paired with streamlined tactile control keys optimized for dual-line medium-traffic office call workflows:

1. Pixel-based monochrome LCD display: High-resolution graphical screen supporting visual Caller ID name/number, real-time call timers, local call history logs, XML visual enterprise application rendering, system menu navigation, date/time clock, dual-line status indicators and voicemail MWI alert notifications.
2. Two vertical tricolor LED illuminated programmable BLF line keys: Visual real-time line state signaling for two independent DNs (solid green = idle line; solid red = active/held call; flashing red = incoming ringing call); keys support BLF presence monitoring for shared extensions or colleague line status tracking.
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 backlit numeric dial pad (0–9, *, #) with rounded tactile keys for easy dialing in busy office environments.
5. Four context-sensitive dynamic softkeys positioned directly below the LCD screen, dynamically mapped to real-time on-screen menu options for voicemail retrieval, corporate directory access and speed dial management.
6. Central five-way directional navigation rocker with integrated select button for scrolling contact directories, call logs and device configuration menus.
7. Auxiliary dedicated control keys: Volume Up/Down rocker (adjustable decibel tuning for handset receiver, speakerphone and ringtone output), Redial shortcut key, End Call key, dedicated Mute hard key with status LED, dedicated Speakerphone hard key with status LED.
8. Vertical red Message Waiting Indicator (MWI) LED on the top chassis edge to notify users of unheard voicemail messages, with persistent steady red illumination until voicemail retrieval.
9. Built-in full-duplex echo-canceling hands-free speakerphone with integrated microphone for two-way conference audio; dedicated RJ9 headset jack integrated on the chassis for permanent wired headset connections.

3. Audio Subsystem & Supported Voice Codecs

• Ergonomic analog coiled handset with noise-isolating receiver, certified HAC (Hearing-Aid Compatible) to meet TIA 810A global accessibility standards for users wearing hearing assistive devices.
• Full-duplex echo-canceling hands-free speakerphone with integrated microphone, optimized for clear two-way conference call audio, with automatic acoustic feedback suppression and background noise reduction.
• Dedicated RJ9 modular analog headset port supporting all standard wired office headsets for long-duration private calls.
• Supported voice audio encode/decode codecs for SCCP/SIP/MGCP media streams: G.711a-law, G.711mu-law, G.729a, G.729AB low-bitrate codec.
• Voice quality optimization features: Voice Activity Detection (VAD), Comfort Noise Generation (CNG), silence suppression and error concealment 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 10/100Mbps Fast Ethernet ports with integrated mini internal network switch, enabling seamless daisy-chaining of desktop PCs without additional wall-mounted network jacks, reducing office cabling infrastructure costs:

• Primary WAN Network Port (labeled “10/100 SW”): Connects the IP phone to corporate LAN switches, VoIP gateways or CUCM voice servers for SCCP/SIP/MGCP call control signaling and RTP voice media data streams.
• Secondary PC Access Port (labeled “10/100 PC”): Provides direct Fast Ethernet wired network connectivity for attached laptops, desktop workstations or POS terminals routed through the phone’s integrated switchCisco.

Supported networking standards: IPv4 addressing only (DHCP dynamic IP assignment or static manual IP configuration), Cisco Discovery Protocol (CDP), LLDP device discovery, 802.1Q voice VLAN tagging, 802.1p Layer 2 QoS traffic prioritization, DIFFSERV and TOS configurable marking, STUN NAT traversal for remote branch office deployments, SNTP network time synchronization. The phone fully supports Cisco Unified SRST SIP fallback registration for WAN connectivity failure disaster recovery.

2. Dual Power Supply Options (Pre-Standard / IEEE 802.3af PoE Primary Power)

1. Native dual-compatibility Power over Ethernet support (primary power source): Compatible with both legacy Cisco pre-standard inline power and official IEEE 802.3af PoE network switches, enabling centralized network power management for standard office cubicle deployments. Input rating: 48V DC PoE power input from all compliant Cisco Catalyst PoE switches.
2. Optional external 48V DC universal AC-to-DC power cube (sold separately) for non-PoE network environments lacking PoE-enabled switches; regional country-specific AC power cords available as separate accessories.

3. Rear Panel Physical Interfaces

1. RJ11 modular handset jack for connecting the coiled handset cord
2. Dual RJ45 10/100 Fast Ethernet PoE switched ports (Network uplink + PC access port)
3. Dedicated RJ9 analog headset audio jack
4. DC 48V auxiliary power input jack for optional external AC 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 / Cisco Unified SRST / third-party SIP PBX auto-provisioning templates; routine call operations are triggered via LCD softkey navigation or dedicated physical Hold, Mute, Speakerphone and Volume keys:

1. Dual-Line Multi-Call Handling Supports two independent directory number (DN) line registrations with multi-call-per-line appearance, enabling multiple concurrent active calls on each office line plus native call waiting functionality. Call hold, consultative call transfer and three-way ad-hoc audio conference calls are accessed via LCD softkey menus. Supports call swap between multiple active calls, automatic last-number redial via dedicated Redial key. Dual line keys support BLF presence monitoring for multi-user shared front-office auxiliary voice lines.
2. Caller ID & Personalization Features Visual Caller ID name/number displayed on the graphical LCD screen; adjustable ringtone volume and multiple selectable distinct ringtone tone options, customizable unique ring alert patterns for internal vs external incoming calls. Local device configuration menu accessible via the navigation rocker for volume, ringtone and network parameter adjustments. Multiple configurable local speed dial numbers programmed via CUCM server-side settings or local phone menus.
3. Standard Office Workplace Calling Functions One-touch redial via dedicated physical key, persistent MWI voicemail indicator via LCD screen pop-up alerts, call forward all/busy/no answer routing rules configurable via CUCM/SIP PBX server-side settings, call park and call pickup functionality, intercom auto-answer calling for cross-department internal staff coordination, toll bar call blocking override support for authorized emergency outbound calling.
4. Local Call Log Storage Onboard persistent flash memory storage for dialed outgoing calls, received answered calls and missed incoming calls; call history data fully viewable via the phone’s graphical LCD screen or embedded web administration portal.
5. Voicemail MWI Integration Native Message Waiting Indicator (MWI) notification delivered via SCCP/SIP/MGCP SUBSCRIBE/NOTIFY messaging; visual pop-up LCD screen alerts plus steady red chassis MWI LED illumination notify users of unheard voicemail messages, with voicemail portal retrieval accessible via dedicated LCD softkey.
6. Supported Security Call Features Anonymous incoming call rejection, outbound caller ID blocking configurable via PBX/server-side settings, end-to-end encrypted SCCP/SIP/MGCP call control signaling (TLS) and encrypted voice media streams (SRTP AES encryption) for secure confidential office voice communications.

Security & Remote Device Management Capabilities

1. End-to-End Encrypted Voice & Signaling Communications TLS transport layer encryption for all SCCP/SIP/MGCP call setup and control signaling; SRTP AES encrypted RTP voice media data streams to prevent unauthorized wired or wireless call audio interception on shared corporate 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 shared office line registrations, speed dial configuration data and network provisioning parameters.
3. Centralized Auto-Provisioning & Unattended Firmware Upgrades Fully unattended remote bulk firmware upgrades pushed via TFTP secure auto-provisioning servers, fully compatible with CUCM, CUCM Express and Cisco Unified SRST SIP fallback voice gateways. Embedded HTTPS web-based local administration portal for on-site device configuration and real-time dual-line registration status monitoring.
4. System Monitoring & Built-In Network Diagnostics Real-time device status tracking available via CUCM / Cisco Unified SRST management consoles, including online/offline LAN connectivity status, dual SCCP/SIP/MGCP line registration state, active call session auditing and centralized syslog event logging for complete office network telephony audit trails; integrated built-in ping diagnostic tool for local LAN connectivity troubleshooting.

Environmental & Regulatory Compliance Certifications

• Regulatory EMI/EMC: FCC Part 15 Class B electromagnetic interference compliance, CE marking per EU EMC directive, AS/NZS CISPR22 Class B certification, ICES-003 Class B, VCCI Class B.
• Safety certifications: UL / C-UL 60950 Second Edition electrical safety certification, EN 60950 Second Edition (including A11 and A12), IEC 60950 Second Edition, CSA C22.2 No. 60950, AS/NZS 60950, GB4943 China national electrical 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, speed dial and network configuration storage; 32MB SDRAM runtime memory for SCCP/SIP/MGCP call processing and network stack operation.
• Lifecycle Status: Long-discontinued End-of-Sale (EoS); limited critical security/bug maintenance support only, no new feature firmware development.
• Warranty: Standard one-year limited Cisco hardware warranty for commercial office, retail and small business end-user deployments.

Key Specification Bullet Points

• Model Number: Cisco CP-7940G (Charcoal Black Two-Line Unified IP Phone; No alternate white chassis variant available)
• Device Type: Mid-Tier Two-Line Unified IP VoIP Desk Phone (Triple Native SCCP / SIP / MGCP Multi-Protocol), Pixel-Based Monochrome Graphical LCD Display, Dual 10/100BASE-TX Fast Ethernet Integrated Switch Ports for PC Passthrough, Full-Duplex Two-Way Echo-Canceling Hands-Free Speakerphone, Built-In RJ9 Headset Jack
• Supported Telephony Protocols: SCCP (Skinny Client Control Protocol) Primary for Cisco CUCM / UCME; SIP v2 Open Standard for Third-Party SIP PBX / Cisco Unified SRST Fallback; MGCP Media Gateway Control Protocol
• Supported Voice Audio Codecs: G.711a / G.711u, G.729a, G.729AB Low Bitrate Codec
• Display: Pixel-Based Monochrome Graphical LCD Screen; Adjustable Contrast & Backlight Brightness, Multi-Language Menu & XML Application Rendering
• Fixed Hardware Function Keys: Two Programmable Tricolor BLF Line Keys, Dedicated Hold, Redial, Transfer, Conference, Mute, Speakerphone Hard Keys; Four Dynamic LCD Context Softkeys, Five-Way Navigation Rocker, Standard 12-Key Numeric Dial Pad
• Audio Features: HAC Hearing-Aid Compatible Handset Receiver, Full-Duplex Echo-Canceling Two-Way Hands-Free Speakerphone, Built-In Dedicated RJ9 Headset Port, VAD Voice Activity Detection, CNG Comfort Noise Generation, Silence Suppression & Error Concealment
• Physical Interfaces: 1 x RJ11 Handset Port, Dual 10/100BASE-TX RJ45 Fast Ethernet Switched PoE Ports (Network Uplink + PC Access Port), Dedicated RJ9 Headset Jack, 48V DC Aux Power Input Jack, Password-Protected Factory Reset Pinhole
• Power Specifications: Dual Compatibility Power Source (Legacy Cisco Pre-Standard Inline Power + IEEE 802.3af PoE Primary Power); Optional Separate 48V DC Universal AC Power Cube (Sold Separately)
• Mounting Method: Two-position adjustable foldable desktop foot stand as standard; Wall mountable via integrated rear chassis cutouts (No separate wall mount accessory kit required)
• Supported QoS & Networking Features: IPv4 DHCP/Static IP Assignment, CDP / LLDP Device Discovery, 802.1Q Voice VLAN Tagging, 802.1p Layer 2 QoS Prioritization, DIFFSERV / TOS Marking, STUN NAT Traversal, SNTP Network Time Synchronization, Cisco Unified SRST Dual SIP Registration Support
• Security Features: TLS Encrypted SCCP/SIP/MGCP 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: Two Independent SIP/SCCP/MGCP Line Registrations with BLF Presence Monitoring, Multi-Call-Per-Line Appearance, Supports Multiple Concurrent Calls + Call Waiting, Softkey-Accessible Hold / Redial / Transfer / Conference Functions, Full-Duplex Two-Way Hands-Free Speakerphone, Built-In Headset Support, LCD Pop-Up MWI Voicemail Message Waiting Alerts, Anonymous Call Rejection, Outbound Caller ID Blocking, Call Forward All/Busy/No Answer, Call Park & Call Pickup, Intercom Auto-Answer Calling, Toll Bar Call Block Override, Local Programmable Speed Dials, Local Call History Log Storage, XML LDAP Corporate Directory Lookup, XML Hosted Application Rendering
• Management Tools: TFTP 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 Network Diagnostic Tool
• Target Deployment Scenarios: General corporate office cubicle employee workstations, retail store supervisory back-office desks, small business manager multi-line front-desk telephones, medium-traffic two-line daily office VoIP environments requiring dual independent multi-call lines, BLF presence monitoring, desktop PC passthrough network capability and permanent wired headset support
• Lifecycle Status: Long-discontinued End-of-Sale (EoS); limited critical security/bug maintenance support only, no new feature firmware development
• Warranty: One-year limited Cisco hardware warranty

Model Quick Reference

• CP-7940G is the mid-tier triple-protocol two-line IP phone of the Cisco Unified IP Phone 7900 Series, supporting SCCP, SIP and MGCP multi-protocol stacks, purpose-built for general office staff, retail supervisors and small business managers with medium daily call volumes, featuring dual programmable BLF line keys, full two-way hands-free speakerphone, integrated dual-port Ethernet switch for desktop PC daisy-chaining and native built-in headset jack support.
• Core positioning: Balanced mid-tier two-line enterprise VoIP endpoint with pixel-based monochrome graphical LCD screen, differentiated from entry-level single-line 7900 models (CP-7911G / 7912G) by three critical hardware upgrades: two programmable BLF line keys for dual independent DNs, triple multi-protocol stack (SCCP/SIP/MGCP), dedicated built-in RJ9 headset jack. It also features full-duplex hands-free conference calling and dual Fast Ethernet PC passthrough switch ports, distinguishing it from monitor-only speaker low-end 7906G models.
• Key internal series differentiation vs other 7900 series models:
  1. CP-7902G / CP-7905G / CP-7906G: Single line, monitor-only one-way speaker (no hands-free calling), single Ethernet port only (no PC passthrough), no dedicated headset jack
  2. CP-7911G / CP-7912G: Single line, basic full two-way hands-free speakerphone, dual Fast Ethernet switch ports for PC passthrough, graphical LCD screen, no built-in dedicated headset jack
  3. CP-7940G: Two independent multi-call lines with BLF presence monitoring, triple SCCP/SIP/MGCP multi-protocol support, full two-way hands-free speakerphone, dual Fast Ethernet switch ports, graphical LCD screen, built-in dedicated RJ9 headset jack
  4. CP-7960G: Six-line flagship high-capacity reception/executive model, large multi-column BLF programmable key panel for up to six directory numbers, identical audio and networking hardware to CP-7940G
• Primary deployment advantage: Cost-effective full-featured two-line office VoIP solution balancing core enterprise telephony functionality, dual-line BLF colleague presence monitoring capability, true hands-free conference calling functionality, integrated Ethernet switch eliminating extra wall network jacks for cubicle PCs, native dedicated headset port for long-duration private calls, triple multi-protocol compatibility supporting on-prem CUCM, Cisco Unified SRST SIP fallback disaster recovery and third-party MGCP media gateway deployments, dual pre-standard/standard PoE power compatibility for mixed-generation corporate switches, compact charcoal chassis form factor, flexible desktop or wall mounting, and centralized remote mass provisioning and firmware upgrade management for multi-branch small business and enterprise office deployments.