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思科认证考试

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Which of the following are functions that are often provided by an ITSP but are not typically  provided by the PSTN?()

  • A、 QoS
  • B、 call setup and teardown
  • C、 call routing
  • D、 call supervision
  • E、 audio signal compression
正确答案:A,E
答案解析:
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