... VoIP applications VJ1000 series is a carrier-grade NGN trunk gateway. There are four different models with 1*E1/T1, ... well under different scenarios. Service-orient Architecture, Rich Services Supported It provide various services, for example, callback, call shop, calling card, ... thousand E1/T1 lines delivered. Total protocols supporting VJ1000 series gateway support PRI, SS7, H.323, SIP, SIP-T. ...