Tonmind IP Speaker is compatible with ONVIF VMS based on the VMS supports audio output streaming. The current VMS we've tested are compatible are Milestone, NX Witness, DW Spectrum VMS. For this application, IP camera field customers can add Tonmind IP Speaker into their VMS for audio control. 

① Make sure the VMS supports Profile T Audio Backchannel.

② Open Tonmind IP Speaker web, enable ONVIF.

③ Open VMS, scan the IP Speaker and press the speaker icon to talk to speaker.