Yeastar SO Module

The Yeastar SO Module is a handy add-on for Yeastar MyPBX series and S-Series PBX phone systems adding one port for connecting a traditional phone line (FXO) and another port for plugging in a regular phone or fax machine (FXS). The key feature is its PSTN Fallback Function. This lets you make and receive calls even if the power goes out to your main PBX system so that you c...