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Arduino/libraries/GSM/examples/ReceiveVoiceCall/ReceiveVoiceCall.ino

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/*
Receive Voice Call
This sketch, for the Arduino GSM shield, receives voice calls,
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displays the calling number, waits a few seconds then hangs up.
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Circuit:
* GSM shield
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* Voice circuit. Refer to to the GSM shield getting started guide
at http://arduino.cc/en/Guide/ArduinoGSMShield#toc11
* SIM card that can accept voice calls
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With no voice circuit the call will connect, but will not send or receive sound
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created Mar 2012
by Javier Zorzano
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This example is in the public domain.
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http://arduino.cc/en/Tutorial/GSMExamplesReceiveVoiceCall
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*/
// Include the GSM library
#include <GSM.h>
// PIN Number
#define PINNUMBER ""
// initialize the library instance
GSM gsmAccess;
GSMVoiceCall vcs;
// Array to hold the number for the incoming call
char numtel[20];
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void setup()
{
// initialize serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.println("Receive Voice Call");
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// connection state
boolean notConnected = true;
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// Start GSM shield
// If your SIM has PIN, pass it as a parameter of begin() in quotes
while (notConnected)
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{
if (gsmAccess.begin(PINNUMBER) == GSM_READY)
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notConnected = false;
else
{
Serial.println("Not connected");
delay(1000);
}
}
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// This makes sure the modem correctly reports incoming events
vcs.hangCall();
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Serial.println("Waiting for a call");
}
void loop()
{
// Check the status of the voice call
switch (vcs.getvoiceCallStatus())
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{
case IDLE_CALL: // Nothing is happening
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break;
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case RECEIVINGCALL: // Yes! Someone is calling us
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Serial.println("RECEIVING CALL");
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// Retrieve the calling number
vcs.retrieveCallingNumber(numtel, 20);
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// Print the calling number
Serial.print("Number:");
Serial.println(numtel);
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// Answer the call, establish the call
vcs.answerCall();
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break;
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case TALKING: // In this case the call would be established
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Serial.println("TALKING. Press enter to hang up.");
while (Serial.read() != '\n')
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delay(100);
vcs.hangCall();
Serial.println("Hanging up and waiting for the next call.");
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break;
}
delay(1000);
}