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    • 3. 发明授权
    • Loop condition prevention at internetwork interface boundary
    • 网络接口边界环路状况预防
    • US08654759B2
    • 2014-02-18
    • US13131590
    • 2009-12-01
    • Xuewen LiCarroll Louise Gray-PrestonJames McEachern
    • Xuewen LiCarroll Louise Gray-PrestonJames McEachern
    • H04L12/66H04J3/16
    • H04M3/545H04M7/127
    • The present invention provides a solution to maximize the chance of completion for an ISUP to SIP direction call by enabling a bigger factor for converting ISUP hop counter to SIP Max-Forwards value than the reverse direction thus enabling more hops in the SIP network. Enabling a bigger factor for ISUP to SIP direction can cause loops without special considerations. This invention provides an algorithm that prevents a “loop condition” that can arise at the interface boundary of two telephone networks, known by their standard names ISUP and SIP networks. The present invention solves the “loop condition” problem by adjusting the Hop Counter and Max-Forward parameter values in a predetermined manner such that the adjusted parameter values break the cycle of providing the same parameter values between networks at the network boundary for an uncompleted connection, or break an endless “loop condition”.
    • 本发明提供一种解决方案,通过使ISUP跳计数器能够比反向方向更高的SIP Max-Forwards值来实现ISUP到SIP方向呼叫的最大化,从而使得SIP网络中的跳数更多。 启用ISUP到SIP方向的更大因素可能导致循环而没有特殊考虑。 本发明提供一种防止在其标准名称ISUP和SIP网络已知的两个电话网络的接口边界处可能出现的“环路状况”的算法。 本发明通过以预定的方式调整跳频计数器和最大转发参数值来解决“循环条件”问题,使得经调整的参数值破坏在网络边界处的网络之间为未完成连接提供相同参数值的周期 ,或打破无休止的“循环条件”。