2N® BRI Enterprise is a GSM/UMTS gateway, which once connected to a PBX uses the digital ISDN BRI interface. Its great advantage is that it allows you to use the TE and NT ports at the same time in what is known as DialThru mode. It also brings with it progressive features, such as counting free minutes, a capable savings algorithm, a CallBack service, or the ability to send and receive SMS messages from your PC