目前，包括我国在内的许多国家都采用了H.323作为IP电话网关之间的协议，整个IP电话系统只是把IP网络作为传输媒介，在用户的接入上还是采用电路交换系统，把IP电话网关作为电路交换网和IP网络的接口。-Currently, including China, many countries had adopted H.323 IP telephony gateway as the agreement between the the entire IP phone system is to bring

Classical Database Application Development Methodology Area of Application This methodology has been created to support the development of medium to large size data intensive applications. An application is data intensive when it need