A method and apparatus for placing calls in a multi-system land mobile radio network. A plurality of call destinations are linked or grouped together into a call group. Each call destination has a preferred system. Selection of a first call destination points to or is linked to at least a second call...http://www.google.com.tw/patents/US5613201?utm_source=gb-gplus-share專利 US5613201 - Automatic call destination/system selection in a radio communication system
