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文本框: GSM Termination

Call to mobile is always more expensive than call to land line. But there are some sim card that they are cheap to make same operator calls. So by GSM termination , you will get cheap voip rate to mobile.

Why we need this scenario    

normally the GSM gateway connect  to the telephone. In this scenario, shang332 FXO gateway connect with the GSM gateway’s FXS port,  then call from voip network reach the shang332 FXO gateway , and connect the GSM gateway. The shang332 will dial the destination number automatically. It work like you dial on a normal analogue phone at the GSM gateway. After that, the mobile phone will ring, the call connects.

Key point: both gateway must support polarity Inverse to provide best billing.

How It work