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Vitual Ringtone
Plays a "ringing dial tone" while the call is being established to the GSM network
Virtual ringtone is used to play a "ringing sound" while the gateway is connecting a call to the GSM network. This feature is important because other gateways have "silence"while the call is being setup which could cause the user to hang up and dial again.
Playing the ringtone while the call is being connected makes it seem normal to the user and removes any confusion.
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