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.
Nexevi International Inc. is a leader in development and production of telecommunications equipment. Nexevi focuses on the business –to-business strata, as well as the Business-to-Customer and Business-to-Government market segments.