Yeastar EX08 Expansion Card$ 59.23 Yeastar EX08 Expansion Card Expansion Board for Yeastar S100 and S300 systems Supports up to 4 optional modules/8 ports, including O2, S2, B2, GSM, UMTS, and CDMA modules Add up to 2 expansion cards to S100 and 3 to the S300 Related products Grandstream UCM6302A IP PBXsSelect options Panatron PXT 308 PABX 3 Lines 8 extension PXT 308Select options Yeastar Neogate TG800 – 8 Port GSM VoIP GatewayAdd to cart Yeastar EX08 Expansion CardSelect options This product has multiple variants. The options may be chosen on the product page Yeastar S100 VoIP PBX Phone SystemAdd to cart