Επιπρόσθετα Yeastar hybrid PBX S20, VoIP SIP protocols, up to 20 users,max 10 concurrent calls. Up to 4 FXS/FXO/BRI ports, up to 1xGSM port. Up to 20 VoIP trunks,2 Slots for Voice Modules. Call Recording, IVR, Conference, VoiceMail, Queues, Provisioning for IP phones.