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P23G -
P23GW -
P22G -
P22P -
P21/P21P -
P20/P20P/P20G
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| Screen | 2.8'' IPS LCD Colour Screen | 2.8'' IPS LCD Colour Screen | 3.5'' B&W LCD Screen | 3.8'' B&W LCD Screen | 2.4'' TFT LCD Colour Screen | 2.3'' FSTN B&W Screen |
| Resoulution | 320×240 | 320×240 | 384×160 | 384×106 | 320×240 | 132×64 |
| Backlight Adjustable | √ | √ | √ | √ | √ | √ |
| SIP Account | 8 | 8 | 2 | 2 | 4 | 2 |
| Line Key | 8 | 8 | 0 | 0 | 4 | 2 |
| PoE Supply | √ | √ | √ | √ | P21P | P20P/P20G |
| USB Port | 1 | 1 | 1 | 1 | 1 | 1 |
| EHS Wireless Headset | √ | √ | √ | √ | √ | √ |
| Bluetooth Dongle | √ | √ | √ | √ | √ | √ |
| Audio Conference | 6-Way Conference | 6-Way Conference | 6-Way Conference | 6-Way Conference | 6-Way Conference | 6-Way Conference |
| Phonebook | 2000 | 2000 | 2000 | 2000 | 2000 | 2000 |
| HD Voice | √ | √ | √ | √ | √ | √ |
| Wi-Fi | 2.4GHz Wi-Fi | 2.4G & 5GHz Wi-Fi | 2.4GHz Wi-Fi | 2.4GHz Wi-Fi | 2.4GHz Wi-Fi | 2.4GHz Wi-Fi |
| Ethernet Port | 2*10/100/1000 Mbps | 2*10/100/1000 Mbps | 2*10/100/1000 Mbps | 2*10/100 Mbps | 2*10/100 Mbps | 2*10/100 Mbps (P20/P20P) 2*10/100/1000 Mbps (P20G) |
| Wideband Codec | G.722, Opus | G.722, Opus | G.722, Opus | G.722, Opus | G.722, Opus | G.722, Opus |
| Placement | Desktop (45°) Wall Mount (15°) | Desktop (45°) Wall Mount (15°) | Desktop (45°) Wall Mount (15°) | Desktop (45°) Wall Mount (15°) | Desktop (45°) Wall Mount (15°) | Desktop (45°) Wall Mount (15°) |