ISDN GSM GATEWAYS

ISDN (Integrated Services Digital Network) is a system of digital phone connections that has been designed for sending voice, video, and data simultaneously over digital or ordinary phone lines, with a much faster speed and higher quality than an analog system can provide. ISDN is basically a set of protocol for making and breaking circuit switched connections as well as for advanced call features for the customers. ISDN is the international communication standard for data transmission along telephone lines and has transmission speeds up to 64 Kbps per channel.

ISDN2 (BRI) is meant for residential and small scale business Internet connections; and, ISDN30 (PRI) (Primary Rate Interface) is designed to provide higher bandwidth.

ISDN2 (BRI) TelecomFM OneStream GBRI OneStream GBRI is designed to provide companies with the means to converge their voice calls on to one medium more... TelecomFM GSM-Route BRI GSM-Route (BRI) has been developed to enable major mobile carriers and resellers to convert outgoing and incoming calls from ISDN to mobile... more...

ISDN30 (PRI) 2N StarGate QuesCom 300 Is a great tool for terminating calls providing maximum performance, stability and reliability... more... QuesCom 300 connects the enterprise's different telecom networks, landline, mobile and VoIP... more... 2N BlueStar QuesCom 400 Its highly sophisticated management of outgoing and incoming calls brings you substantial savings on calls to GSM networks... more... GSM capacity: QuesCom 400 allows from 0 to 12 simultaneous GSM channels. ISDN cards: it includes an ISDN card, BRI or PRI... more... 2N BlueTower   Converts fixed-to-mobile or mobile-to-fixed calls into much cheaper mobile-to-mobile calls. Thanks to the sophisticated Least Cost Router (LCR)... more...

Both the BRI and PRI are designed similarly. That is, both make use of the B and D channels for data communication, but in different combinations. B Channel or the Bearer Channel is used for data transmission - including voice - and D channel is meant for signaling and control (data can also be transmitted through D channels).

The basic rate interface, BRI, is made up of two 64 Kbps B-channel and one 16 Kbps D-channel. Hence, it is also referred to as 2B+D. Bonding together the two B channels, BRI can provide a data rate up to 128 Kbps.

The primary rate interface, PRI, has a greater number of B channels, which varies from nation to nation across the globe, and a D channel with a bandwidth of 64 Kbit/s.

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