Cisco IP Phone 7940 Series Manual

The Cisco IP Phone 7940 Series is a feature-rich VoIP telephone designed for enterprise environments, supporting SIP and SCCP protocols, high-quality audio, a large graphical LCD display, programmable line and feature keys, Power over Ethernet (PoE), and integration with Cisco Unified Communications Manager. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting to Network 7. Using Phone Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Graphical LCD display, Handset, Speakerphone, Programmable line/feature keys, Navigation button, Volume rocker, Ethernet ports.

Feature	Description
Graphical LCD	High-contrast display for call information and menus
Handset	Full-duplex speaker with noise-canceling microphone
Speakerphone	Hands-free communication
Programmable Keys	Configurable line keys and soft keys for features
Navigation Button	For menu navigation and selection
Volume Rocker	Adjusts handset, speaker, and ringer volume
Ethernet Ports	10/100 Mbps switch with PoE support (SW and PC ports)
Headset Port	For external headset connection
Power Connector	Optional external power if PoE not available
Mute Button	Mutes microphone during calls

Installation

Unpack and inspect contents. Place on stable surface.

Connect to Network: Use Ethernet cable to connect SW port to network switch.
Connect PC (optional): Use second Ethernet cable from PC port to computer.
Power the Phone: Use Power over Ethernet (PoE) or connect external power adapter.
Attach Handset: Connect coiled handset cord to handset jack.

WARNING! Use only approved power sources. Ensure network cables are securely connected.

First-Time Setup

Power on phone; follow on-screen prompts.

Network Registration: Phone will attempt to register with Cisco Unified Communications Manager.
Configure Settings: Use Settings button to set language, time, and network parameters.
Extension Assignment: Administrator will assign directory number and features.
Test Call: Place a test call to verify audio quality and connectivity.

CAUTION! Do not disconnect during firmware upgrade. Ensure stable network connection.

Specifications

Display: 5-line graphical LCD with backlight.
Protocols: SIP and SCCP.
Audio: Wideband audio support, G.711, G.729 codecs.
Network: 10/100 Mbps Ethernet, IEEE 802.3af PoE.
Memory: Flash memory for firmware and configuration.
Supported Features: Call hold, transfer, conference, forward, voicemail.
Power Source: 48V DC via PoE or external power adapter.
Operating Temp: 32°F to 104°F (0°C to 40°C).

Controls and Settings

Access menu via Settings button. Front Panel: Handset, Speakerphone, Mute, Headset, Volume, Navigation cluster, Soft keys.

Soft Keys: Context-sensitive for call features (Hold, Transfer, Conference, etc.).

Settings: Network configuration, User Preferences (ring tone, display contrast), Phone Status (model, firmware). Audio: Adjust volume for handset, speaker, ringer. Display: Contrast, backlight timeout. Network: View IP address, subnet, gateway. Security: Configure authentication if required.

Connecting to Network

Ethernet: SW port to network; PC port to computer. Power: PoE or external adapter.

Turn off devices before connecting.
Connect Ethernet cable from switch to SW port.
For PC pass-through, connect computer to PC port.
Plug power adapter if PoE not used.

Tip: Use Category 5e or higher Ethernet cables for best performance.

Using Phone Features

Supports basic and advanced telephony features.

Place Call: Lift handset or press Speakerphone, dial number.
Answer Call: Lift handset, press Speakerphone, or press Answer soft key.
Hold: Press Hold soft key to place call on hold.
Transfer: During call, press Transfer, dial target, press Transfer again.
Conference: During call, press Conference, dial participant, press Conference again.
Forward: Press CFwdAll soft key, enter destination number.
Voicemail: Press Messages button to access voicemail.
Redial: Press Redial button to call last dialed number.

WARNING! Do not use excessive force on buttons or handset cord.

Accessibility Features

Visual Alert: Flashing LED for incoming calls. Hearing Aid Compatible: Handset meets HAC standards. Volume Boost: Adjustable volume for ringer, handset, speaker.

Care & Cleaning

Unplug from power before cleaning. Use dry, lint-free cloth; no liquids or abrasive cleaners.

CAUTION! Do not spray liquids directly on phone; avoid extreme temperatures.

Regulatory Information

FCC Part 15: Class A digital device; complies with limits for business use. CE marked for European compliance. Copyright © Cisco Systems, Inc. For support, visit www.cisco.com or contact Cisco Technical Assistance Center.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	PoE/Power adapter	Check Ethernet cable; verify PoE switch or use power adapter.
No display	Power/backlight	Ensure phone is powered; adjust display contrast.
No dial tone	Network/registration	Check network connection; verify registration with call manager.
Poor audio quality	Network/connections	Check cables; verify network QoS settings.
Cannot make calls	Configuration	Verify directory number assignment; check call restrictions.

Reset: Press and hold # key during boot to reset settings (admin required).

Service: Contact Cisco TAC or authorized service provider.