Yeastar S20 VoIP IPBX support up to 10 concurrent calls

Yeastar S20 VoIP IPBX:

Brand: Yeastar
Product code: S20
20 Users
10 Concurrent Calls
Up to 4 FXS/FXO/BRI Ports
Up to 1 GSM/3G/4G Channel
20 VoIP Trunks
Easy to use. Powerful in Production
Built for Small Business
Yeastar S20 is a stand-alone PBX system with an unrivalled range of features for business with less than 20 users. It’s built to be simple to use and powerful in production.
With Yeastar S-Series, all the telephony interfaces are modular and customizable, S20 support 2 onboard module slots to custom FXS, FXO, ISDN BRI, GSM/3G/4G.

Yeastar S20 Datasheet -PDF