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EX08 board supports up to 4 modules (8 RJ11 ports).

EX30 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 unique modular design.

D30 is a DSP module, used to expand the capacity of PBX. With a D30 module added, the number
of extensions increases by 100 and concurrent calls increases by 30 additionally.