Using Asterisk PBX software and standard PC hardware a user can create a SOHO telephony environment which includes all the sophisticated features of a high end PBX / Voicemail platform.
SO Module(1 FXS & 1 FXO Ports): Unique PSTN Fallback Function! Make/receive calls even when system powers down.
S2 Module(2 FXS Ports): The S2 is a module with 2 FXS ports to terminate two analog telephone.
O2 Module(2 FXO Ports): The O2 is a module with 2 FXO ports to terminate two analog PSTN(POTS) lines.