it = timeoutList.iterator();
while(it.hasNext()){
SipcRequest request = it.next();
if(request.getRetryTimes()<maxTryTimes){ //重发次数未超过指定的次数，重新发送这个包
logger.debug("Request was timeout, now sending it again... Request="+request);
request.incRetryTimes(); //递增重试次数
request.setAliveTime(curTime+aliveTime); //更新存活时间
this.processOutcoming(request); // 重新发送这个包
}else{ //这个包已经超过重发次数，通知超时
logger.warn("A request was sent three times, handle this timeout exception...Request="+request);
this.handleRequestTimeout(request);