Refer to the exhibit. Which option correctly describes the order of signaling and call processing events when a branch employee calls headquarters?（） 
- A、P，S，T，U
- B、U，T，S，P
- C、S，U，P，T
- D、P，U，S，T
- E、S，P，U，T
- F、S，P，T，U
正确答案:C
答案解析:有
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