1. Describe the services offered by RTP, RTCP, RTSP and SIP.

2. Which transport layer protocol is used when running RTP? Justify your answer.

3. How does the sequence number and timestamp fields contribute in the evaluation of the network performance?

4. How are different RTP streams in different sessions identified by a receiver?

5. What does the RTCP report include?

6. What is the difference between receiver RTCP report and sender RTCP report?

7. How does SIP process during the encoding negotiation if the receiver does not have the required encoder by the sender?

Problem 1: Assume a video conference with 5 participants with a total available bandwidth of 400 kbps. What is the bandwidth amount assigned to each user to receive RTCP report packets at a specific time one sender with 4 recipients? (Note that RTCP uses 5% of the available bandwidth)

Problem 2: State whether the following statements are true or false, justify your answer (give a concise and clear explanation) 1. RTP provides some QoS guaranties. A. True B. false

2. When using RTP, it is possible for a sender to change encoding in the middle of a session. A. True B. false

3. All applications that use RTP must use port 87. A. True B. false

4. If an RTP session has a separate audio and video stream for each sender, then the audio and video streams use the same SSRC. A. True B. false

5. Suppose Alice wants to establish an SIP session with Bob. In her INVITE message she includes the line: m=audio 48753 RTP/AVP 3 (AVP 3 denotes GSM audio). Alice has therefore indicated in this message that she wishes to send GSM audio. A. True B. false

6. Referring to the preceding statement, Alice has indicated in her INVITE message that she will send audio to port 48753. A. True B. false

7. SIP messages are typically sent between SIP entities using a default SIP port number. A. True B. false

8. In order to maintain registration, SIP clients must periodically send REGISTER messages. A. True B. false

9. SIP mandates that all SIP clients support G.711 audio encoding. A. True B. false