| Audio features |
| • | Optima HD voice |
| • | 20-foot (6-meter) microphone pickup range |
| • | Built in 3 microphone arrray, 360 degree vocie pickup |
| • | 56mm diameter and 10w speaker |
| • | Full-duplex speakerphone with AEC |
| • | Echo cancellation tail length is up to 320ms |
| • | Background noise suppression |
| • | Codecs: G722, G722.1C, G726, G729, G723, iLBC, Opus |
| • | DTMF: In-band, Out-of-band (RFC 2833) and SIP INFO |
| • | VAD, CNG, PLC, AJB, AGC |
| Phone features |
| • | 1 VoIP account |
| • | Call hold, mute, DND, call recording, hotline |
| • | 5-way conference calls |
| • | Flash |
| • | Redial, call waiting, emergency call |
| • | Call forward, call transfer, call return, dial plan |
| • | Ring tone selection/import/delete |
| • | Set date time manually or automatically |
| • | Volume adjustment |
| • | Pairing via Bluetooth |
| Display |
| • | 3.1" 248x120-pixel graphical LCD with backlight |
| • | 25
total keys: 4 soft keys, off-hook key, on-hook key, 12-key numerical
keypad, Bluetooth, mute, volume keys, 2 navigation keys, OK key |
| • | Phone lock |
| • | Multilingual user interface |
| • | Caller ID with name and number |
| Interface |
| • | 1xRJ45 10/100M Ethernet port |
| • | Built-in Wi-Fi (2.4GHz,802.11 b/g/n) |
| • | Built-in Bluetooth 4.0 |
| • | Power over Ethernet (IEEE 802.3af ), class 3 |
| • | 1 x USB 2.0 port |
| • | 1x Security lock port |
| Other physical features |
| • | External Yealink power adapter: AC 100~240V input and DC 12V/1A output |
| • | Power consumption (PoE): 3.9w-7.6w |
| • | Dimension (W*D*H): 307.8mm*298.5mm*66.9mm |
| • | Operating humidity: 10~90% |
| • | Storage temperature: -10~40°C (+14~104°F) |