To which SIP response class do the SIP response codes 300 to 399 belong?
A. Provisional
B. Client Failure
C. Server Failure
D. Successful
E. Redirection
Answer: E
Which SIP request method enables reliability of SIP 1xx response types?
A. ACK
B. PRACK
C. OPTIONS
D. CANCEL
E. REGISTER
Answer: B
