>  | Compatible with standard SIP protocol, independently accessible to VOIP phone system (Asterisk, Elastix, Freeswitch, MiniSipServer, Yeastar MyPBX etc. mainstream IP-PBX).;  | >  | Rugged and durable, high-grade aluminum alloy panel, protection rating IP54;  |    | 
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>  | Available for choosing single or double-key to realize full duplex intercom;  | >  | With a built-in 3W speaker and dual microphone, available for hands-free call, receiving broadcast and live monitoring; |    | 
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>  | With a built-in HD wide-angle camera (1080P) of the H.264 coding format to make HD video intercom;  | >  | With terminal camera function of wide dynamic range which suppresses strong light and compensates low light for working normally in backlighting environment;  |    | 
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>  | With a built-in digital audio processor to enhance the effect of noise reduction and improve the voice pick-up distance and audio quality;  | >  | Supportive of onvif protocol to send video to the 3rd-party platform for displaying;  |    | 
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>  | Video backtrace, supportive of large-capacity FLASH storage to save current video in real time, the microphone in control center can display both real-time and backtrace video of terminal during intercom;  | >  | To intercept and upload automatically the terminal's current video image to screen of microphone when calling to the microphone in control center which is busy;  |    | 
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>  | Supportive of offline intercom (initiation & receiving) without server;  | >  | Supportive of tamper alarm, the server will alert automatically when someone open it during its normal working state;  |    | 
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>  | With 1 interface of alarm out to control door lock or alarm light and 1 interface of alarm in to connect external panic button;  | >  | With 1 Rec out channel for 24 hours recording;  |    | 
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>  | With a standard RJ45 interface, supportive of crossing network segment and router, accessible to the system if the Ethernet is available;  | >  | Supportive of POE power supply. |    |