The Sip Talkback speaker has the ability to program a dial-down number into the speaker. For example a teacher in the classroom can press a button and the speaker will call administration number directly.
The SIP Talkback Speaker has a 4 way terminal connector, Relay In and Relay Out.
Relay In – Closing this circuit will result in dialing pre-programmed number. (You can Connect the 433Mhz Controller to this Circuit).
Relay Out – Off Hook, this close the circuit. This is used to turn on a LED light to signify that the talkback is live.
