Yeastar S20 is a stand -alone telephone system offering an unrivalled range of features to small business with less than 20 users. It supports 10 concurrent calls and various combinations of telephony ports including FX S, PSTN, ISDN BRI, and GSM /CDMA /3G. Powered by the latest processor technology, Yeastar's S-Series PBX is a trust worthy telephone system with one of the highest MTBF (Mean Time Between Failures) in the industry. Based on Asterisk 13, S-Series is born to be powerful and constantly meeting your needs.Yeastar S-Series VoIP PBX provides flexible telephony interfaces combination while allowing for future scalability with unique modular design. Besides the built-in rich SIP capabilities, S-Series lets you decide what types of extensions and physical trunks you need in your telephone system. When your business grows, adding more users and concurrent calls is also possible with S-Series. With Yeastar S-Series, all the telephony interfaces are modular and customizable, whether its FXS, FXO, ISDN BRI, GSM/3G, or E1/T1/PRI. S20 has 2 onboard module slots.SPECIFICATION20 Users10 Concurrent CallsUp to 4 FXS/FXO PortsUp to 4 BRI PortsUp to 1 GSM/CDMA/3G ChannelNOTE : Belum termasuk module FXO, FXS, BRI, dan GSMHIGHLIGHTSIncludes 5,000 minutes of expandable voicemail storageBuilt-in call recording capabilityAdd on powerful apps including auto provisioning, LDAP, and moreFree lifetime software/firmware upgradesConnect multiple sites and remote users instantlyNo hidden charges or extra licensing feesLow power consumption at 1.8-10.6WAutomated attendant (IVR)Email to SMS/SMS to emailFax to emailPaging/intercomMobility extensionMusic on holdSIP forkingVoicemail to emailDesktop and wall-mount capable