A simulation system analyzes a call control signal received from an electronic automatic exchange. When it is determined that the received signal is for a trunk connected to another electronic automatic exchange, the simulation system determines an address on a LAN of another simulation system from...http://www.google.com.tw/patents/US5838767?utm_source=gb-gplus-share專利 US5838767 - Method of simulative testing stored program control type electronic automatic exchange 
