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背景资料： 某高校新建一栋办公楼和一栋实验楼，均为现浇钢筋混凝土框架结构。办公楼地下1层、地上11层，建筑檐高48m；实验楼6层，建筑檐高22m。建设单位与某施工总承包单位签订了施工总承包合同。合同约定，电梯安装工程由建设单位指定分包。 施工过程中，发生了如下事件： 事件一：在主体结构施工前，与主体结构施工密切相关的某国家标准发生重大修改并开始实施，现场监理机构要求修改施工组织设计，重新审批后组织实施。 事件二：针对某分部工程，施工单位编制如下进度计划时标网络图，并在第6个月底和第11个月底对实际进度进行检查，绘制进度计划前锋线如下图所示（单位：月） 事件三：办公楼主体结构施工至六层时，工程所在地发生了持续2h的暴雨，并伴有短时6～7级大风。风雨结束后，施工项目负责人组织有关人员对现场脚手架再次进行检查验收，排除隐患后恢复了施工生产。 事件四：办公楼电梯安装工程早于装饰装修工程施工完，提前由总监理工程师组织验收，总承包单位未参加。验收后电梯安装单位将电梯工程有关资料移交给建设单位。整体工程完成时，电梯安装单位已撤场。由建设单位组织，监理、设计、总承包单位参与进行了单位工程质量验收。 事件一中，除了国家标准发生重大修改的情况外，还有哪些情况发生后也需要修改施工组织设计并重新审批？
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【单选题】Refer to the exhibit. What is the sequence of events when a VoIP call is placed from IP phone P1 to IP phone P2？ （）
A.
RTP traffic is exchanged between IP phone P1 and IP phone P2. IP phone P1 alerts the CCM of off-hook state. CCM instructs IP phone P1 to provide dialtone. IP phone P1 passes digits to CCM. CCM routes call to PSTN or IP phone P2.
B.
CCM instructs IP phone P1 to provide dialtone. IP phone P1 alerts the CCM of off-hook state. IP phone P1 passes digits to CCM. CCM routes call to PSTN or IP phone P2. RTP traffic is exchanged between IP phone P1 and IP phone P2.
C.
CCM instructs IP phone P1 to provide dialtone.IP phone P1 alerts the CCM of off-hook state. IP phone P1 passes digits to CCM. RTP traffic is exchanged between IP phone P1 and IP phone P2. CCM routes call to PSTN or IP phone P2.
D.
IP phone P1 alerts the CCM of off-hook state. CCM instructs IP phone P1 to provide dialtone. IP phone P1 passes digits to CCM. CCM routes call to PSTN or IP phone P2. RTP traffic is exchanged between IP phone P1 and IP phone P2.
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