1.2 What are the RTP protocols and how are they used in VolP? Provide a description and diagram of the RTP protocol stack and describe the protocols. How are RTP protocols affected by jitter, delay and lost packers? What can be done about jitter, delay and packet loss? [10 marks] Total [10 +10 -20 marks] N2 Router A L1 2 Router D Router B N1 N3 L5 Router C 2 N4 Multicast server Group member Router E Router F N5 N6 1 Group member Group member Figure 1