The EX08 from Yeastar is an expansion board designed for the VoIP PBX systems S100 and S300. It provides the capability to add up to 4 modules to support PSTN, ISDN, and GSM lines. The S100 can accommodate up to two EX08 boards, while the S300 can accommodate up to three, making it possible to integrate many different types of lines to meet all the telephony needs of a modern business.

• RJ1: 1 Port
• Interface: 4
• Supported Model: P560, P570
• Supported Module: S2 Module, O2 Module, SO Module, B2 Module, GSM Module, 3G Module, 4G LTE Module