A callback system is created utilizing a hybrid telecommunication system including a switched communication network and a packet transmission network. A call parameter database is stored in a memory. A call is received on the system. The call parameter database is accessed to determine at least one call...http://www.google.com.hk/patents/US6731625?utm_source=gb-gplus-share專利 US6731625 - System, method and article of manufacture for a call back architecture in a hybrid network with support for internet telephony
