Cisco Telephone Manual 7821

The Cisco IP Phone 7821 is a single-line, entry-level IP phone designed for basic voice communication in business environments. It features a monochrome display, support for Power over Ethernet (PoE), a built-in Ethernet switch, and integration with Cisco Unified Communications Manager (CUCM). 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: Monochrome LCD display, Handset, Keypad, Ethernet ports, Power connector, Headset port.

Feature	Description
Display	Monochrome LCD for call information and menus
Handset	Standard handset with receiver and microphone
Keypad	12-button dial pad for dialing and menu navigation
Ethernet Ports	Two 10/100BASE-T ports for network and PC connection
Power over Ethernet (PoE)	Receives power via Ethernet cable (IEEE 802.3af)
Headset Port	2.5mm port for optional headset connection
Speakerphone	Full-duplex speakerphone for hands-free calls
Hold Button	Places active call on hold
Volume Control	Adjusts handset, speakerphone, and ringer volume
Messages Button	Accesses voice messaging system

Installation

Unpack and inspect contents. Place phone on stable surface.

Connect to network: Plug Ethernet cable from switch into the NETWORK port on the phone.
Connect PC (optional): Plug Ethernet cable from PC into the PC port on the phone.
Connect power: Use the provided power adapter if PoE is not available.
Connect handset: Plug the handset cord into the HANDSET port.
Connect headset (optional): Plug into the HEADSET port.

WARNING! Use only approved power sources. Ensure cables are not pinched or damaged.

First-Time Setup

Power on phone; it will register with Cisco Unified Communications Manager.

Network registration: Phone obtains IP address and downloads configuration from CUCM.
Verify registration: Check for extension number and "Registered" status on display.
Set user preferences: Use the Settings menu to configure ringtone, contrast, etc.
Test call: Place a test call to verify audio and connectivity.

CAUTION! Do not unplug the phone during firmware download or configuration.

Specifications

Display: Monochrome LCD, 2 lines.
Network: 10/100BASE-T Ethernet, IEEE 802.3af PoE.
Protocols: SIP (Session Initiation Protocol), SCCP (Skinny Client Control Protocol).
Audio: G.711, G.729 audio codecs, wideband audio support.
Power Source: 48 VDC via PoE or external power adapter.
Operating Temperature: 32°F to 104°F (0°C to 40°C).
Supported Features: Call hold, transfer, conference, forward, voice messaging.
Dimensions: 8.3 x 9.1 x 7.1 inches (210 x 230 x 180 mm).

Controls and Settings

Access menus via the Navigation button and softkeys. Front Panel: Handset, Display, Keypad, Speakerphone, Hold, Volume Control.

Key Functions: Navigation button (up/down/select), Messages, Hold, Speakerphone, Mute, Headset, Volume.

Settings Menu: Ringtone selection, Display contrast, Network configuration (view IP address), User preferences (name, time format). Phone Configuration: Admin settings via CUCM web interface (line appearance, speed dials, call forwarding).

Connecting Devices

Network: NETWORK port to switch. PC: PC port to computer. Power: Power adapter if no PoE.

Turn off connected devices before making connections.
Use Cat5e or higher Ethernet cables for reliable performance.
Ensure proper cable seating; connectors should click into place.

Tip: Label cables for easy identification during maintenance.

Using Phone Features

Supports basic and advanced telephony features.

Place a call: Lift handset or press Speakerphone, dial number, press Dial softkey.
Answer a call: Lift handset, press Speakerphone, or press Answer softkey.
Hold: Press Hold button to place call on hold; press Resume to retrieve.
Transfer: During a call, press Transfer, dial target number, press Transfer again.
Conference: During a call, press Conference, dial participant, press Conference again.
Forward calls: Use Call Forward All in Settings menu or via CUCM.
Voice messages: Press Messages button to access voicemail.
Adjust volume: Use Volume button during a call or while idle for ringer volume.

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

Accessibility Features

Visual Alert: Flashing LED for incoming calls. Audio Adjustments: Volume control for handset, speaker, ringer. Hearing Aid Compatible: Handset is HAC rated. For additional accessibility options, consult CUCM administrator.

Care & Cleaning

Unplug power before cleaning. Use a soft, dry cloth. For stubborn marks, dampen cloth with water only; do not use solvents.

CAUTION! Do not spray liquids directly on phone. Avoid abrasive cleaners.

Regulatory Information

FCC Part 15: Class A digital device; complies with limits for business use. ICES-003: Complies with Canadian EMI regulations. CE Mark: Conforms to European EMC and safety directives. Copyright © Cisco Systems, Inc. For support, visit www.cisco.com or contact Cisco Technical Assistance Center.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power/display	Power source/cable	Check PoE switch or power adapter; reseat Ethernet/power cable.
No network registration	Network/CUCM config	Verify Ethernet connection; check CUCM configuration; restart phone.
No dial tone	Line configuration	Ensure line is assigned in CUCM; check for service outages.
Poor audio quality	Network/connections	Check network for packet loss; reseat handset/headset cables.
Buttons not responding	Software/firmware	Restart phone; update firmware via CUCM if available.

Reset: Unplug power, wait 10 seconds, reconnect. For factory reset, consult administrator.

Service: Cisco Technical Assistance Center; www.cisco.com/go/support