Voice over Internet Protocol (VoIP) gateway is a device that converts analog telephony signals to digital. After converting the signal, the VoIP gateway organizes it into data packets and encrypts it for transmission. VoIP vendors use VoIP gateways for switched and network interfacing.
SMS Modem Types
A SMS modem is a specialized type of modem which accepts a SIM card, and operates over a subscription to a mobile operator, just like a mobile phone. From the mobile operator perspective, a GSM modem looks just like a mobile phone. When a GSM modem is connected to a computer, this allows the computer to use the GSM modem to communicate over the mobile network.
SMS modems exposes an interface that allows applications such as SMS Caster, Diafaan, BUKA to send and receive messages over the modem interface. The mobile operator charges for this message sending and receiving as if it was performed directly on a mobile phone.
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