Users can set the volume via web interface-audio-volume, or adjust it by IP tool/audio manger, or set it via Http API/CGI.
Yes, we have Http URL API to trigger alarm, music play and also support Http API/CGI. You can configure it on web interface-alarm-http url.
You can arrange a SIP call to the IP speaker with built-in MIC model, like SIP-S01M or SIP-S21M, which support 2-way intercom function, then starting two-way conversation after picked up the call. YES, Pls install softphone (eg.linphone, zoiper, microsip) on Android/APP phone then registering ip speaker and make a call.
We can use NX/milestone VMS to search and locate IP speaker without using any softwares of Tonmind, and make intercom and listening function directly by VMS.
Yes, Tonmind SIP-T20 IP paging gateway support relay out and alarm in function, which make it possible to combine light and sound in alarm and warning system.