The design of i20S IP Door phone are based on experience and knowledge of Fanvil IP phone development.i20S are using standard IP/RTP/RTSP protocol for voice transmission and enjoy the advantages of full range of compatibility.i20S have a variety of enterprise-level features and compatible with lots of major platforms, such as 3CX, Asterisk, Broadsoft, Elastix, etc.
| ModelCompare |  i33V/i33VF SIP Video Door Phone |  i32V SIP Video Door Phone |  i31S SIP Video Door Phone |  i20S SIP Audio Door Phone |
| SIP Line | 2 | 2 | 2 | 2 |
| Camera | √ | √ | √ | × |
| Screen | 128X48 Dot-matrix with backlight | × | × | × |
| Standalone intercom-No Central Unit /Server Needed | √ | √ | √ | √ |
| RTSP | √ | √ | √ | × |
| ONVIF | √ | √ | √ | × |
| HD Video(720P) | √ | √ | √ | × |
| HD Audio(G.722) | √ | √ | √ | √ |
| Linkage with Third Party IP Camera | × | × | × | √ |
| Built-in Electric Relay | 2 | 2 | 1 | 1 |
| Access control | √ | √ | √ | √ |
| Numerical Keypad | √ | × | √ | √ |
| DSS Key | × | 1 | 1 | 1 |
| Built-in RFID/IC Card Reader | √ | √ | √ | √ |
| Power Supply PoE | √ | √ | √ | √ |
| Built-in 12V DC | √ | √ | √ | √ |
| Tamper-Proof | √ | √ | √ | × |
| Protection Level | IP65&IK10 | IP65&IK10 | IP65&IK10 | IP65 |
| Wide Temperature Range | -40°C~70°C | -40°C~70°C | -40°C~70°C | -10°C~60°C |
| Power Amplifier | 3W | 3W | 3W | 3W |
| RFID/IC Card Number | 5000 | 5000 | 5000 | 5000 |
| Short Circuit Output | 2 | 2 | 1 | 1 |
| Short Circuit Input | 2 | 2 | 1 | 1 |
| Auto-Provisioning via DHCP/TR069/SIP PNP | √ | √ | √ | √ |
| Integration with Third Party Systems | √ | √ | √ | √ |
| Icon Indication | √ | × | √ | √ |
| Weigand Port | √ | √ | × | × |
| Download | Datasheet | Datasheet | Datasheet | Datasheet |
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