Cisco IP Phone 7942 Manual

The Cisco IP Phone 7942 is a full-featured VoIP telephone designed for enterprise environments, supporting the Session Initiation Protocol (SIP). It features a high-resolution pixel-based display, four programmable line/feature buttons, a built-in speakerphone, headset support, 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 Devices 7. Using Phone Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-resolution display, Handset, Speakerphone, Four programmable line/feature buttons, Navigation cluster, Volume rocker, Headset port, Ethernet ports.

Feature	Description
Display	Pixel-based LCD with backlight for call information and menus
Programmable buttons	Four buttons configurable for lines, speed dials, or features
Speakerphone	Full-duplex speakerphone for hands-free calls
Headset port	2.5mm port for wired headset connectivity
Ethernet ports	Two 10/100BASE-T ports for network and PC pass-through
Navigation cluster	Four-way navigation with Select button for menu control
Volume rocker	Controls handset, headset, speakerphone, and ringer volume
Mute button	Mutes the microphone during a call
Power	Powered via Power over Ethernet (PoE) or external power adapter

Installation

Unpack and inspect contents. Place on stable surface.

Connect network: Plug Ethernet cable from switch into SW port on phone.
Connect PC (optional): Plug PC Ethernet cable into PC port on phone.
Connect handset: Use coiled handset cable to connect handset to phone.
Power the phone: Use PoE from switch or connect external power adapter.

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

First-Time Setup

Power on phone; follow on-screen prompts.

Network registration: Phone will attempt to obtain IP address and register with call server.
Configure settings: Use phone menus or web interface to set time, date, ring tone.
Program buttons: Assign line extensions, speed dials, or features to programmable buttons.
Test call: Place a test call to verify audio and network connectivity.

CAUTION! Ensure proper ventilation; do not block vents on phone.

Specifications

Display: 3.5-inch pixel-based LCD with backlight.
Protocols: SIP (Session Initiation Protocol).
Audio: Wideband audio support, G.711, G.729a codecs.
Ports: Two 10/100BASE-T Ethernet, 2.5mm headset, handset.
Power: IEEE 802.3af PoE or 48V DC external power adapter.
Supported features: Call hold, transfer, conference, forward, voicemail.
Operating Temp: 32°F to 104°F (0°C to 40°C).
Dimensions: 8.25 x 10.5 x 6.5 inches (approx).

Controls and Settings

Access menus via Navigation cluster. Front Panel: Speakerphone, Mute, Volume rocker, Headset button.

Buttons: Line/feature buttons, Hold, Transfer, Conference, Messages, Settings, Navigation cluster.

Settings: Time/Date, Ring Tone, Screen Contrast, Network Configuration, Button Programming. Audio: Volume controls for handset, speaker, ringer, headset. Network: IP address, subnet mask, gateway, DNS, VLAN settings.

Connecting Devices

Network: SW port to switch. PC: PC port to computer. Headset: 2.5mm jack.

Turn off devices before connecting cables.
Match cables to ports (Ethernet to SW/PC, handset to handset port).
Power on phone; verify network link lights.

Tip: Use quality CAT5e or higher Ethernet cables for reliable connectivity.

Using Phone Features

Supports basic and advanced telephony features.

Make call: Lift handset or press Speakerphone, dial number.
Answer call: Lift handset, press Speakerphone, or press flashing line button.
Hold: Press Hold button during call.
Transfer: Press Transfer, dial target number, press Transfer again.
Conference: Press Conference, dial participant, press Conference again to join.
Forward calls: Use menu to set call forward always, busy, no answer.
Voicemail: Press Messages button to access voicemail.
Speed dial: Program speed dials to buttons for one-touch calling.

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

Accessibility Features

Visual Alert: Flashing line button for incoming calls. Audio Adjustments: Independent volume controls for ringer, handset, speaker, headset. High-Contrast Display: Adjust screen contrast for better visibility.

Care & Cleaning

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

CAUTION! Do not spray liquids directly on phone; avoid heat and moisture.

Regulatory Information

FCC Part 15: Class A digital device; complies with limits for business environments. 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 display/power	Power source/cable	Check PoE switch or power adapter; verify Ethernet cable.
No dial tone	Network/registration	Verify network connectivity; check phone registration status.
One-way/no audio	Network/audio settings	Check VLAN/QoS settings; verify audio codec configuration.
Buttons not working	Configuration	Re-program buttons via phone menu or web interface.
Cannot transfer/conference	Server configuration	Verify feature enablement on call server; check SIP profiles.

Reset: Settings > Factory Reset (use with caution).

Service: Contact Cisco TAC or authorized service provider.