myTimer = new TransactionTimer(this); sipStack.timer.schedule(myTimer, 0, SIPTransactionStack.BASE_TIMER_INTERVAL); }
if (sipStack.timer != null) {   TimerTask myTimer = new TransactionTimer(); sipStack.timer.schedule(myTimer, 0, SIPTransactionStack.BASE_TIMER_INTERVAL); } }
    protected void startTransactionTimer() {        myTimer = new TransactionTimer(this);        sipStack.timer.schedule(myTimer, 0,                SIPTransactionStack.BASE_TIMER_INTERVAL);    }