Yeastar EX30 Module has 1 onboard E1/T1/PRI port to expand 1 E1/T1/PRI trunk for S100 VoIP PBX, S300 VoIP PBX, P560 VoIP PBX, and P570 VoIP PBX. It allows users to flexibly customize IP PBX with a unique modular design.

Yeastar O2 Module - 2-FXO ports  - PBX VoIP Module O2, 2 FXO Ports, Connect 2 Analog PSTN (POTS) lines