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.
UWTELECOM ofrece las mejores soluciones VoIP y numeros 800 en Costa Rica. Nuestros precios son los mas bajos del mercado y la calidad de nuestras llamadas la mejor