Cisco 400-051 Exam

Which header field does a SIP User Agent Client use to advertise that it supports Provisional Response Acknowledgement?

  • A. Supported: 100rel
  • B. Cseq: PRACK
  • C. Require: 100rel
  • D. Allow: PRACK
  • E. Accept: 100rel
Answer: Option D.
Explanation: 
No answer description available for this question

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