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General| Full-duplex speakerphone | Yes |
|---|---|
| Wall-mountable | Yes |
| Bluetooth | No |
| Wi-Fi | No |
| Ethernet Ports | Dual Gigabit Ethernet ports 10/100/1000 |
| PoE | Yes (802.3af) |
| Programmable Line Keys | 4 |
| Network Protocols | SIP, VLAN, DHCP |
| Security | 802.1X authentication, secure boot |
| Operating Temperature | 32°F to 104°F (0°C to 40°C) |
| Lines | 4 |
| Audio Codecs | G.711, G.722, G.729, iLBC |
Procedure for initial phone setup and network connection by an administrator.
Steps to adjust the handset rest to prevent the handset from slipping out of the cradle.
Requirements for connecting the phone to the telephone network via an Ethernet cable.
Detailed explanation of the physical buttons and their functions on the Cisco IP Phone 6851.
Guide to using the navigation cluster and understanding softkey, line, and feature button interactions.
Description of phone screen sections and instructions for cleaning the display.
Overview of accessibility features for users with visual, hearing, and mobility impairments.
Features supporting hearing-impaired users, including HAC and TTY compatibility.
Features for vision-impaired users, covering visual alerts, contrast, and navigation aids.
Features for mobility-impaired users, focusing on lighted and tactile buttons for ease of use.
Monitoring coworker lines with BLF and finding essential phone product and network details.
How to view phone status, status messages, and line status information.
Accessing transaction status details and reviewing the phone's reboot history.
Procedures for making standard calls, using speakerphone/headset, and redialing.
Steps to make an emergency call and important considerations for location services.
Controlling outbound caller ID and blocking specific calls.
Introduction to speed dial setup and usage for faster call placement.
Steps for assigning and configuring speed dial entries on the phone and line keys.
Understanding line monitoring, shared line usage, and accessing public services.
Procedures for answering incoming calls and managing call waiting features.
How to decline calls and enable/disable the Do Not Disturb (DND) setting.
Methods to enable or disable blocking of calls from anonymous or unlisted numbers.
Configuring custom call screening rules, including allowing or blocking specific numbers.
Using mute, hold, call swapping, and call parking features for call control.
Steps for parking calls using lines or star codes and retrieving parked calls.
Enabling and disabling call forwarding for various scenarios: all calls, busy, no answer, out of service.
Performing attended, blind, and direct-to-voicemail call transfers.
Adding participants to calls and utilizing multicast paging functionality.
Managing multiple lines, answering oldest calls, and understanding shared line characteristics.
Procedure to look up and dial contacts from the phone's corporate directory.
Adding, searching, and calling contacts within the personal address book.
Editing and removing contacts from the personal address book.
Configuring speed dial numbers with special characters like pauses and authorization codes.
How to view and filter recent calls, including all calls, missed, received, and placed.
Using call return to dial the last caller and managing individual call records.
Steps to clear the entire recent calls list or delete specific call entries.
Procedure to erase all saved call history records from the phone.
Methods for accessing voicemail from the phone, another phone, or remotely.
Indicators for new, urgent, or missed voicemail messages on the phone screen.
Customizing phone behavior through User Preferences and Device Administration menus.
Configuring call waiting tones, auto answer, and missed call shortcut features.
Adjusting audio preferences, preferred devices, and ringtone settings.
Setting up and customizing the phone's screen saver appearance and timing.
Modifying backlight timer, screen contrast, and display modes for specific functions.
Changing time format, date format, and language settings for the phone.
Configuring power save mode and performing a phone restart procedure.
