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Yeastar EX08 Module RJ11 Expansion Board has 1 onboard E1/T1/PRI port. YST-EX08 supports Yeastar S100 or S300 IP-PBX to give custom functionality to your VoIP phone system. It has features like supports up to 4 optional modules, including O2, S2, B2, GSM, UMTS, and CDMA modules, 8 RJ11 ports, etc. If you buy today, our online shop offers at a cheap price....