Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
We specialise in the installation, configuration and maintenance of all sizes and types of Asterisk, VoIP, IP PBX, and Billing solution from basic small-business systems to enterprise-based solutions.