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The Yeastar EX08 expansion board has 4 onboard module slots for the future expansion and 8 port RJ-11 for interfaces on the panel. This board is well supported by the Yeastar S-Series models (S100 and S300) and Yeastar P-Series models (P560 and P570) IP PBX systems.

• EX08 Expansion Board support Yeastar S-Series models (S100 and S300) and Yeastar P-Series models (P560 and P570) 
• Supports up to 4 optional modules(8 RJ-11 Interface port), supporting Yeastar Module: O2, S2, BRI, GSM, CDMA, and UMTS/3G modules
• Support up to 2 expansion cards to S100 and P560 and 3 expansion card to the S300 and P570

**^(optional) If required ?, You can add or customize up to 4 optional module cards: (8 analog port (FXO/FXS/BRI)) and/or 4 channel of GSM/CDMA/3G  in your EX08 Expansion Boards according to your requirements below.