This paper introduce the rollback checkpointing algorithm in the retry-recovery technique. In order to reduce the system overhead, it presents a scheme implementing in the virtual memory.
本文介绍了容错重算恢复技术中的向后滚动检查点算法。并针对减少系统开销的问题，提出了在虚拟存贮器中的一种实现方案。
Since there are no implementation methods in SIP standards (RFC3261), a finite state machine of client's transaction and its dataflow diagram are designed with rollback pointers algorithm.
因为SIP协议标准本身（RFC3261）并没有给出实现方法，本文通过采用指数后退算法设计SIP客户事务的有限状态机及其流程图。
Since there are no implementation methods in SIP standards (RFC3261), a finite state machine of client's transaction and its dataflow diagram are designed with rollback pointers algorithm.
因为SIP协议标准本身（RFC3261）并没有给出实现方法，本文通过采用指数后退算法设计SIP客户事务的有限状态机及其流程图。
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