An intercom system is a two-way communication electronic device that contains circuitry for the purpose of transmitting and receiving audio and/or video transmissions.
These intercom terminals can dial 1, 4 or up to 999 pre-configured telephone numbers. Available as a direct dial HPU, they automatically dial a preconfigured telephone number (or two) via a PSTN or PABX network once the call button(s) is pressed The intercoms feature enabled noise reduction and echo cancellation technology for quality audio and clear conversations. The Direct Dial series intercom terminals include configurable relays ideal for door or gate access.
Ip pbx is a pbx system with ip connection based on TCP/IP protocol, pbx is a switch that implements communication internal line, and ip pbx transmits ip signal in pbx to realize integrated communication system. Through the telecommunication network and the Internet, Ip pbx can provide users with multiple communication methods such as voice, fax, data and video with only a single device.