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.
Mymplus VOIP is the next generation VOIP. Headed by Mr. Lance Lomako CEO of Momentum Plus Inc. The company deploys state of the art VOIP IPBX systems for Small and Medium sized companies