The Yeastar EX08 Expansion Board is a versatile addition to the Yeastar P-Series PBX System and S-Series VoIP PBX. This expansion board provides support for up to 4 modules, offering a total of 8 RJ11 ports for added flexibility in telephony interfaces. With its unique modular design, businesses have the freedom to customize their telephone system, selecting the specific types of extensions and physical trunks required. As businesses grow, additional users and concurrent calls can be effortlessly integrated, ensuring that communication systems remain in sync with evolving business requirements.