From Forum Nokia Wiki

This article intends to explain how to handle most of the events on a call using CTelephony in 3rd Edition

Events handled here are:

1. Call Ringing
2. Call Answered
3. Call connecting
4. Call connected
5. Call disconnected
6. Dial call

The implementation is so simple. The idea is simply active object listening to change in voice line

Contents 1 Headers Required 2 Libraries Required 3 Capability Required 4 Code 5 MPhoneReceiverObserver 6 CPhoneReceiver Declaration 7 CPhoneReceiver Implementation 8 Output

Headers Required

#include <Etel3rdParty.h>

Libraries Required

LIBRARY   etel3rdparty.lib

Capability Required

Capability  NetworkServices

Code

The following code assumes that you have a class for log text (CMyLog).

Define observer interface to be implemented by class you want it to be notified with events (if you like)

MPhoneReceiverObserver

#ifndef MPHONERECEIVEROBSERVER_H
#define MPHONERECEIVEROBSERVER_H
 
class MPhoneReceiverObserver
{
public:
	virtual void CallRinging() {}
 
	virtual void CallAnswered() {}
 
	virtual void DialingCall() {}
 
	virtual void CallConnecting() {}
 
	virtual void CallConnected() {}
 
	virtual void CallDisConnected() {}
 
};
 
#endif // MPHONERECEIVEROBSERVER_H

Define the active object that will listen to any change in voice line status

CPhoneReceiver Declaration

#include <e32base.h>	// For CActive, link against: euser.lib
#include "Etel3rdParty.h"	//For CTelephony, link against etel3rdparty.lib
 
#include "MPhoneReceiverObserver.h"
#include "MyLog.h"
 
class CPhoneReceiver : public CActive
{
public:
	// C++ constructor
	CPhoneReceiver(MPhoneReceiverObserver& aPhoneReceiverObserver);
 
	// Second-phase constructor
	void ConstructL();
 
	// Cancel and destroy
	~CPhoneReceiver();
 
public: // New functions
	// Function for making the initial request
	void StartL();
 
private: // From CActive
	// Handle completion
	void RunL();
 
	// How to cancel me
	void DoCancel();
 
private:
	//Define object to CTelephone to manage calls
	CTelephony*				iTelephony;
 
	CTelephony::TCallInfoV1 		iCurrentCallInfo;
	CTelephony::TCallInfoV1Pckg		iCurrentStatusPckg;
 
	CTelephony::TCallId			iCallID;
 
	MPhoneReceiverObserver&			iPhoneReceiverObserver;
 
 
};
 
#endif

CPhoneReceiver Implementation

#include "PhoneReceiver.h"
 
CPhoneReceiver::CPhoneReceiver(MPhoneReceiverObserver& aPhoneReceiverObserver) 
	:	CActive(EPriorityStandard),
		iCurrentStatusPckg(iCurrentCallInfo),
		iPhoneReceiverObserver(aPhoneReceiverObserver)
{
}
 
void CPhoneReceiver::ConstructL()
{
	//Create new object to telephony
	iTelephony = CTelephony::NewL();
	CActiveScheduler::Add(this);		// Add to scheduler
}
 
CPhoneReceiver::~CPhoneReceiver()
{
	Cancel(); // Cancel any request, if outstanding
 
	delete iTelephony;
}
 
void CPhoneReceiver::DoCancel()
{
	iTelephony->CancelAsync( CTelephony::EVoiceLineStatusChangeCancel );
}
 
void CPhoneReceiver::StartL()
{
	Cancel();		// Cancel any request, just to be sure
 
	//Notify of change in telephone line
	iTelephony->NotifyChange( iStatus, CTelephony::EVoiceLineStatusChange, 
		iCurrentStatusPckg );
 
	SetActive();			// Tell scheduler a request is active
}
 
void CPhoneReceiver::RunL() 
{
	if(iStatus.Int() == KErrNone)
	{
		//Get call status
		CTelephony::TCallStatus callStatus = iCurrentStatusPckg().iStatus;
 
		switch(callStatus)
		{
		case CTelephony::EStatusRinging:
			iPhoneReceiverObserver.CallRinging();
			break;
 
		case CTelephony::EStatusAnswering:
			iPhoneReceiverObserver.CallAnswered();
			break;
 
		case CTelephony::EStatusDialling:
			iPhoneReceiverObserver.DialingCall();
			break;
 
		case CTelephony::EStatusConnecting:
			iPhoneReceiverObserver.CallConnecting();
			break;
 
		case CTelephony::EStatusConnected:
			iPhoneReceiverObserver.CallConnected();
			break;
 
		case CTelephony::EStatusDisconnecting:
			iPhoneReceiverObserver.CallDisConnected();
			break;
 
		default:
#ifdef __USE_PHONE_RECEIVER_LOG__
			TBuf<50> num;
			num.Copy(_L("Default: "));
			num.AppendNum(callStatus);
			CMyLog::OpenAndWriteToFile(num);
#endif
			break;
		}
	}
	else
	{
#ifdef __USE_PHONE_RECEIVER_LOG__
		TBuf<50> num;
		num.AppendNum(iStatus.Int());
		num.Append(_L(" -- "));
		CTelephony::TCallStatus callStatus = iCurrentStatusPckg().iStatus;
		num.AppendNum(callStatus);
		CMyLog::OpenAndWriteToFile(num);
#endif
	}
 
        //Notify every time before activate object
	iTelephony->NotifyChange( iStatus, CTelephony::EVoiceLineStatusChange, 
		iCurrentStatusPckg );
 
	if(!IsActive())
		SetActive();
 
}

Output

The following is a sample for the log file written above

Log:25-4-2009-15-18-53
////////////////////
Call Ringing
////////////////////
Call Answered
////////////////////
Call connected
////////////////////
Call disconnected
////////////////////
Default: 1 //Line Idle
////////////////////