an answering phone calls system , including means for implementing waiting options for the caller , in case it is not possible to answer the phone at that moment . the caller can choose between waiting on the queue , or asking the system to call him / her back , when only a short time will be left to wait . the caller can choose between a long queue and a short queue , wherein : a . in the short queue , each conversation is time limited , the waiting time in this queue is usually smaller , and the caller will usually get a faster response , when the caller does get answered , a limited service time will be available for the conversation , after which the caller will be automatically disconnected ; b . whereas in the long queue , each conversation is not limited by time , however waiting time to get answered could be longer .