Yeastar EX08 is an expansion board with eight external RJ11 ports and four internal card slots for adding compatible Yeastar modules. The EX08 fits into a Yeastar S100 or S300 IP-PBX to give custom functionality to your VoIP phone system. Available modules offer 2 FXS, 2 FXO, 1 FXS/1 FXO, BRI, GSM,and 3G.Yeastar EX08 is a rise board with eight peripheral RJ-11 harbors and four center card niches for additionwell-matchedYeastar modules. The EX08 fits into a Yeastar S100 or S300 IP-PBX to give convention functionality to your VoIP phone system.