HOMEVoIP (Voice over IP)IP PBX HardwareYeastar P550 VoIP PBX with 1 yr Enterprise Feature Subscription Yeastar 11-19832 Yeastar P550 VoIP PBX with 1 yr Enterprise Feature Subscription SKU #11-19832 Oh oh! That product is no longer available... Check out these alternatives Yeastar P550 VoIP PBX for up to 50 users, 25 concurrent calls, advance... Details Yeastar P560 VoIP PBX for upto 200 users, 60 concurrent calls, advance... Details Yeastar P570 VoIP PBX for up to 500 users, 120 concurrent calls, advan... Details Yeastar S100 VoIP PBX appliance, 100 users, 30 concurrent calls Details VIEW ALL IP PBX Hardware