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.
IVR Guru conceiving a great CLOUD TELEPHONY in India. It is a technology that manages business service, sales, support, public or social rapport and online industry exercise exhausted control over their client communications.