SO Module FXO & FXS

Unique PSTN Fallback Function! Make/receive calls even when system power break down. It can be used in MyPBX SOHO, MyPBX Standard, MyPBX E1, MyPBX Enterprise, MyPBX U100, MyPBX U200, MyPBX U5XX and TDM800 Card SO Module FXO & FXS