PBX-GSM modules by Yeastar are compatible with Yeastar’s PBX-STD, PBX-U100, PBX-U500 and PBX-U510. Yeastar’s S-Series PBX-S20, PBX-S50, PBX-S100 and PBX-S300 are also supported and available from Scoop. Each module supports a single GSM trunk for incoming and outgoing calls.
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