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.
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Scalable and Modular S-Series VoIP PBX
Yeastar S-Series VoIP PBX provides flexible telephony interfaces combination while allowing for future scalability with the unique modular design. Besides the built-in rich SIP capabilities, S-Series lets you decide what types of extensions and physical trunks you need in your telephone system. When your business grows, adding more users and concurrent calls is also possible with S-Series.
With Yeastar S-Series, all the telephony interfaces are modular and customizable, whether it’s FXS, FXO, ISDN BRI, GSM/3G, or E1/T1/PRI. S20 has 2 onboard module slots, S50 and S412 support 4. S100 and S300 require the combination of Expansion Board and Telephony Module to add telephony interfaces. S100 allows 2 Expansion Boards and S300 supports 3.