1. Explain, in one paragraph, the origin of the SIP protocol and the H.323 protocol suite, respectively. How are they different from each other? Which protocol is becoming more popular than the other?
2. The IT department of ABC Inc. configured its voice equipment to use the G. 711 codec on the local VoIP network. What's the payload bit rate of G. 711? Why is it not sufficient to carry a complete VoIP call?
3. When capturing and observing voice packets of a VoIP call using Wireshark, what is the protocol header between the layer 4 UDP header and the payload of a voice packet? Justify, in one paragraph, why at layer 4 the UDP protocol instead of TCP is chosen to carry voice traffic in VoIP.