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.
Crexpedio.com provides responsible technical assistance and service on enterprise level systems in Costa Rica.
We currently do ITFS in S America,N America Mexico, US and Canada alongside our strategic partners for Europe and Asia.