The Intercom is based on the embedded Linux OS and industrial standard RFC3261 (SIP 2.0), has high compatibility with major IPPBXs and dispatch systems. This intercom supports two-way voice talking, 1~3 speed dial buttons, 2 sets of relay control output input, POE power supply, external power amplifier, etc. This product can be widely used in public emergency places such as commerce, education, logistics, medical treatment, high-speed, barrier and so on.