You are examining a SIP packet. There is no final response to the ACK method. What is the reason for this?

Question

Options

• AThe ACK method was defined only in RFC 2543 and it has been deprecated.
• BThe ACK method is part of the INVITE transaction.
• CThe ACK method is an exception in RFC 3261.
• DThe ACK method is an optional SIP method.
• EThe ACK method was replaced with the CANCEL method in RFC 3261.

• A
  6% (3)
• B
  88% (42)
• C
  2% (1)
• D
  4% (2)

Explanation

Explanation/Reference:

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