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How to Mute a Ringing tone in 3rd edition Devices?
When a call arrives, its ringing tone can be muted with Phone Client Extension API, part of the API extension plug-in package for S60 3rd Edition.
3rd party Telephony API (CTelephony) can be used for observing incoming call events.
#include <RPhCltServer.h> // link against PhoneClient.lib
#include <PhCltExt.h> // link against PhoneClientExt.lib
User::LeaveIfError( iPhoneClientServer.Connect() );
User::LeaveIfError( iLibrary.Load(KPhoneCltExDllName) );
TInt res = iLibrary.Lookup(1)();
CPhCltExtFactory* phCltExtFactory = reinterpret_cast<CPhCltExtFactory*>( res );
iPhCommandHandler = phCltExtFactory->CPhCltCommandHandlerLD();
User::LeaveIfError( iPhCommandHandler->Open(iPhoneClientServer) );
// Mute an ongoing ringing tone. This should be done inside an active object
// (a class derived from CActive)
iPhCommandHandler->MuteRingingTone( iStatus );