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[6 Marks] Q 4(a) Consider the Session Initiation Protocol (SIP). i) Describe the use of the SIP registrar. (3 marks) ii) Describe the use of the SIP proxy. (3 marks) Q 4(b) [9 Marks] Consider a Voice over IP application. i) Discuss why UDP might be preferred over TCP for the transport VoIP data? (3 marks) ii) Describe one disadvantage of using UDP to transport VoIP data. (3 marks) iii) Describe the use of Real-time Transport Protocol (RTP) to support Volp applications. (3 marks) Q 4(c) [10 Marks] Describe the technique of adaptive playout delay for packet voice transmission in terms of: ti the timestamp of the ith packet ri the time packet i is received by the receiver pi the time packet i is played at the receiver