VoIP equipment which utilises VoIP technology for the conversion of analogue voice streams to digital voice packets is known as VoIP gateways. Traditional telephones and PBX systems with Ethernet based networks and TDM networks (PSTN) are the Voice over IP gateways interfaces. With this the company can IP enable a legacy PBX system, existing telephone lines could be connected to a new VoIP system and at the same time calls can be made through PSTN by using VoIP phone system.
A number of VoIP gateways are available which include Analogue Voice over Internet Protocol Gateways and Digital VoIP Gateways.
Analogue Voice over Internet Protocol Gateways
Two different configurations, FXS and FXO are used by Analogue VoIP gateways. FXS Gateways are used for the connection between traditional telephones and VoIP system. In this case the FXS ports are used to plug traditional telephones and at the same time the gateways Ethernet port is used for the connection of the network. On the other hand FXO gateways are utilised for connecting VoIP system to POTS (Plain Old Telephone Service) lines. FXO ports are used to plug POTS lines and in the same way gateway’s Ethernet port connects it to the network.
A number of configurations are seen in Analogue IP gateways. They range from 4 ports to 48 ports. You can even find combo analogue VoIP gateways with FXS and FXO ports.
Digital VoIP Gateways
T1, E1, J1 and BRI are the four different configurations used by Digital Voice over IP gateways.
T1 Gateways are used in North America, E1 Gateways are used in Europe, J1 Gateways are used in Japan and BRI gateways are used with ISDN service. Various configurations from a single channel to 32 channels are found in Digital IP gateways. Digital IP gateways come in combo that is T1/E1 or T1/E1/J1 configurations.
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