Yeastar SO-MODULE 1 FXO, 1 FXS ports, add analogue phone & PSTN line to Yeastar VoIP PBX
![1 FXO, 1 FXS ports, add analogue phone & PSTN line to Yeastar VoIP PBX](https://cdn.n2erp.co.nz/sna_7997037D-0128-4104-B866-3D126751B9E7/images/products/large/SO-MODULE_636053078512754980.jpg)
1 FXO and 1 FXS ports for Yeastar P- and S- Series PBX, Unique PSTN Fallback Function - Make/receive calls even when the PBX system powers down