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GSM

A400 Series

The 4 port FXS module specifically refers to a module with four FXS ports, allowing connectivity for up to four analog devices. Each FXS port typically provides the necessary voltage, dial tone, and signaling to support the functionality of an analog device. These modules are commonly used in business environments where there's a need to integrate existing analog devices, such as traditional phones or fax machines, into a VoIP infrastructure.