The Telecom FM GSM Route BRI is a Dual SIM GSM Gateway that has an ISDN2e interface.  The GSM Route BRI Gateway is designed for connection to an ISDN Telephone System to enable calls to be made directly over the mobile phone network using standard mobile phone SIM cards.  When using a GSM Gateway like the GSM Route BRI the cost of calls depends upon the SIM Card Tariff, some mobile phone networks offer free calls to other mobiles on the same account and many networks supply tariffs that offe4r bundled minutes of cross network calls that can be cheaper than traditional landline calls.

 

The Telecom FM GSM Route BRI Gateway holds 2 SIM cards and connects to an ISDN2e Trunk port of a phone system to enable 2 simultaneous calls to be made from the phone system.  If more calls are required it is simply a case of adding another gateway to another ISDN Trunk port of the PBX.