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The best application of GSM gateway is its cost saving feature. It saves up to 80% costs of calls made between fixed network and GSM network. Though the amount of saving depends on the tariff, you must check configuration of each device for accurate information.
Yes, it can be used as back-up system in case of ISDN communication system fails. In this way, you can re-route all the PBX call to SIM card of this gateway. It will keep all the communication channels open.
No, this is not possible as GSM Gateway is a digital device and it will not support an analogue device. However, it can be possible to do so by using an ST adaptor but you will also need to use echo cancellation cards as well.
The IP supported protocols are either Transparent or SIP protocol commonly used for VoIP. GSM gateway does not support it and it is better to find some other codec for this purpose.
The GSM Gateway can be ordered with either the normal power supply modules, or a wide range power supply that will cover all required power requirements.
GSM gateway needs to be installed directly to the incoming lines of the telecom system or to the PBX. It also comes with an inbuilt Cost router to overtake the features PBX lacks in it.
GSM gateway can be connected via BRI/ISDN2 or PRI/E1/ISDN 30 or via a U interface. To connect it via U interface, you will need a U Line Card. But in every case, the protocol will be same ISDN protocol.
It is always recommended to use external directional antenna for GSM gateway instead of internal antenna to get great signals.

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