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Yeastar S300 gives midsize enterprises a customizable IP-PBX for controlling telephony for 300 users and 60 simultaneous calls, all from a single rack-mounted device. The Yeastar S-Series VoIP PBXs feature a modular design. For the S300 that means that you can install three expansion boards, choosing from two options. The first option lets you integrate digital telephones into your VoIP system using the EX30 Expansion Board, which has a single E1/T1/PRI port. The second option is the EX08 Expansion Board, which features eight RJ11 ports and four card slots for modules. Each EX08 board can take four of the following modules:

  • S2 Module: 2 FXS (analog)
  • O2 Module: 2 FXO (analog)
  • SO Module: 1 FXS / 1FXO (analog)
  • B2 Module: 2 BRI (digital)
  • GSM Module: 1 GSM (cellular)
  • 3G Module: 1 UMTS (cellular)


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