Aria A20x T1/E1 Gateway is an Open Sources asterisk based VoIP Gateway Solutions for Operators and call centers. It is a converged media Gateway product. This kind of Gateway connects traditional telephone systems to IP networks and integrates VoIP PBX with the ISDN seamlessly. With friendly GUI, users may easily set up their customized gateway. Also secondary development can be completed through AMI
(Asterisk Management Interface)