A Multiservice Access Concentrator (MAC) receives a called number and matches the number against a destination-pattern index. A logical group of single access telephone numbers are associated to at least one voice port, wherein a logical group of candidate voice ports are formed. The logical group of...http://www.google.com.hk/patents/US6763017?utm_source=gb-gplus-share專利 US6763017 - Method and apparatus for voice port hunting of remote telephone extensions using voice over packet-data-network systems (VOPS)
