A method and apparatus for network server recovery maintains an ongoing call by reconstructing its call context from a server-state attribute (SSA) that is generated by a first server, recorded in separate storage and retrieved by a second server in the event that a connection to the first server is...http://www.google.com.tw/patents/US7526533?utm_source=gb-gplus-share專利 US7526533 - Active call context reconstruction for primary/backup resource manager servers
