| Product type | IP Phone |
| Product colour | Black |
| Handset type | Wired handset |
| Backlight keypad | Y |
| Mounting | Desk/Wall |
| Lines quantity | 2 lines |
| Caller ID | Y |
| Call waiting | Y |
| Call hold | Y |
| Call forwarding | Y |
| Conference call | Y |
| Anonymous call rejection | Y |
| Call transfer | Y |
| Message-waiting indicator (MWI) | Y |
| Volume control | Digital |
| Touchscreen | N |
| Display diagonal | 6.35 cm (2.5") |
| Display resolution | 240 x 120 pixels |
| Backlight display | Y |
| Front camera | N |
| Speakerphone | Y |
| Microphone mute | Y |
| Voice codecs | G.711alaw,G.711ulaw,G.722,G.722.2,G.729A,G.729B,G.729ab,OPUS,iLBC |
| Ethernet LAN | Y |
| Ethernet LAN interface type | Fast Ethernet |
| Ethernet LAN data rates | 10,100 Mbit/s |
| Supported network protocols | SIP, IPv4, IPV6, DNS, DHCP, SNTP, NUT, STUN, UDP, TCP, LLDP |
| DHCP client | Y |
| Networking standards | IEEE 802.3af |
| Ethernet LAN (RJ-45) ports | 2 |
| RJ-9 ports quantity | 1 |
| DC-in jack | Y |
| Safety | UL 60950, CAN/CSA-C22.2 No. 60950, EN 60950, IEC 60950, AS/NZS 60950 |
| Certification | CE
EMC
FCC |
| Compliance industry standards | TIA 810, TIA 920 |
| Power over Ethernet (PoE) | Y |
| Operating temperature (T-T) | 0 - 40 °C |
| Operating relative humidity (H-H) | 10 - 90% |
| Width | 207 mm |
| Depth | 171 mm |
| Height | 37.5 mm |
| Weight | 512 g |
| Number of handles included | 1 pc(s) |
| Description |
| Cisco 6821. Product type: IP Phone, Product colour: Black, Handset type: Wired handset. Lines quantity: 2 lines. Volume control: Digital. Display diagonal: 6.35 cm (2.5"), Display resolution: 240 x 120 pixels. Voice codecs: G.711alaw,G.711ulaw,G.722,G.722.2,G.729A,G.729B,G.729ab,OPUS,iLBC |