mercoledì 14 novembre 2012
Voice over IP (Voice over Internet Protocol) indica un serie tecnologie volte alla trasmissione di comunicazioni vocali e sessioni multimediali usando il Protocollo di trasmissione di Internet (IP).
Per usufruire del servizio bisogna registrarsi presso uno dei numerosi VOiP providers, le cui liste sono facilmente reperibili sul web.
Un gateway VoIP è appunto un dispositivo gateway che consente di usare Internet per trasmettere e riceve comunicazioni vocali e trasmissioni fax.
Cisco Small Business offre una gamma di gateway compatti ed economici che permettono di collegare i dispositivi telefonici analogici alla rete VoIP. Sono dotati di una porta Ethernet (per cavo RJ-45) e di più porte FXS (Foreign eXchange Subscriber, per cavo RJ-11) a cui connettere i dispositivi telefono/fax.
Gateway Cisco dotato di 2 porte FXS:
Gateway Cisco dotato di 8 porte FXS:
Gateway Cisco dotato di 1 porta FXS e di una porta FXO (Foreign eXchange Office) per connettersi ad una linea telefonica tradizionale; le due porte hanno configurazione indipendente:
Schema che mette a confronto la linea telefonica tradizionale con un gateway dotato di porte FXS e porta FXO:
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