Tech specs
Brand
Cisco
Product Line
Cisco IP Phone
Model
6821
Manufacturer
Cisco Systems
IP Address Assignment
DHCP, Static
IP Telephony Network Ports
2 x Ethernet 10Base-T/100Base-TX
Network Features
Class 2 PoE, Network Address Translation (NAT)
Network Protocols
DNS, HTTP, HTTPS, Link Layer Discovery Protocol (LLDP), SNTP, TCP, TFTP, UDP
Phone Connections
2 x network / RJ-45, Headset jack / RJ-9
Backlit Display
Yes
Color Support
Monochrome
Display Diagonal Size
2.5 inch
Display Diagonal Size (metric)
6.35 centimetre
Display Location
Base
Display Resolution
240 x 120 pixels
Display Type
LCD display
Indicators & Controls
Voice message waiting indicator
Multiple Conferencing
Yes
Speakerphone
Yes
Voice Codec
G.711µ, G.711a, G.722, G.722.2, G.729a, G.729ab, G.729b, iLBC, iSAC, Opus
Additional Functions
Intercom
Call Services
Call Forwarding, Call Hold, Call Transfer, Call Waiting, Caller ID, Message Waiting Capability, Voicemail
Caller ID Type
Caller ID/call waiting
Dialer Location
Base
Lines Supported
2 lines
Main Features
Integrated Ethernet switch, Multiple VoIP protocol support
Packaged Quantity
1
Placing/Mounting
Table-top, Wall-mountable
Power Over Ethernet (PoE) Support
Yes
Product Type
VoIP phone
Quality of Service
IEEE 802.1p, IEEE 802.1Q (VLAN)
Security
IEEE 802.1X, TLS
VoIP
Yes
VoIP Protocols
SIP, SRTP
Volume Control
Yes
Base Depth
20.7 centimetre
Base Height
3.75 centimetre
Base Weight
456 gram
Base Width
17.1 centimetre
Body Material
ABS polycarbonate
Color Category
Black
ENERGY STAR Certified
No
EPEAT Compliant
No
TCO Certified
No
Hearing Aid Compatible
Yes