How do you check if a SIM card is busy with an incoming call?

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Hi guys and gals,
I'm creating an application to send text messeges via a portech MV-374 VoIP GSM gateway. Sometimes my client's customers mistakenly gives calls to the gateway device and this somehow interrupts the execution of the AT commands which sends text messages to customers. So I'm thinking of first checking if the sim is busy with an incoming call and if not execute the AT commands. How should I do this?
Thanks!!

Posted 24-Jan-12 11:28am

obhasha07

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