According to one embodiment of the invention, a method of processing calls includes configuring a gatekeeper to forward all dialed phone numbers to a call manager. The method also includes receiving a signal at the gatekeeper from a first endpoint requesting an IP address of a second endpoint corresponding...http://www.google.com.tw/patents/US8064439?utm_source=gb-gplus-share專利 US8064439 - Method and system for call processing
