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GSM : GSMVoiceCall class

answerCall()

Description

Accepts an incoming voice call. The method returns are different depending on the modem mode (asynchronous or synchronous), see below for details.

Syntax

voice.answerCall()

Parameters

none

Returns

int
In asynchronous mode, answerCall() returns 0 if last command is still executing, 1 if successful, and >1 in case of an error. In synchronous mode, it returns 1 if the call is answered, 0 if not.

Example

#include <GSM.h>

// PIN Number
#define PINNUMBER ""

// initialize the library instance
GSM gsmAccess; // include a 'true' parameter for debug enabled
GSMVoiceCall vcs;

char numtel[20];           // buffer for the incoming call

void setup()
{
  // initialize serial communications
  Serial.begin(9600);
  Serial.println("Receive Voice Call");

  // connection state
  boolean notConnected = true;

  // Start GSM shield
  // If your SIM has PIN, pass it as a parameter of begin() in quotes
  while(notConnected)
  {
    if(gsmAccess.begin(PINNUMBER)==GSM_READY)
      notConnected = false;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }

  // This makes sure the modem notifies correctly incoming events
  vcs.hangCall();

  Serial.println("Waiting Call");
}

void loop()
{
  // Check the status of the voice call
  switch (vcs.getvoiceCallStatus())
  {
    case IDLE_CALL: // Nothing is happening

      break;

    case CALLING: // This should never happen, as we are not placing a call

      Serial.println("CALLING");
      break;

    case RECEIVINGCALL: // Yes! Someone is calling us

      Serial.println("RECEIVING CALL");

      // Retrieve the calling number
      vcs.retrieveCallingNumber(numtel, 20);

      // Print the calling number
      Serial.print("Number:");
      Serial.println(numtel);

      // Answer the call, establish the call
      vcs.answerCall();        
      break;

    case TALKING:  // In this case the call would be established

      Serial.println("TALKING. Enter line to interrupt.");
      while(Serial.read()!='\n')
        delay(100);
      vcs.hangCall();
      Serial.println("HANG. Waiting Call.");      
      break;
  }
  delay(1000);
}

 
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See Also

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