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.
The group (ANWAR NAJD) was established in 1978 as a supplier and installer of power transmission line. In 1987 we have entered the IT market as a system builder and a retailer under the name BITCOM.