Which of the following are functions that are often provided by an ITSP but are not typically provided by the PSTN？（）A、 QoSB、 call setup and teardownC、 call routingD、 call supervisionE、 audio signal compression
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
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