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.
Company Alphatalk Communications (HongKong) is created in 2001. The basic purpose of the company - development of a perspective direction of transfer of the traffic between Russia and the countries of the Asian region.