1. Assume that sender sends silence suppressed RTP stream of G.711 audio to receiver. During talk spurt 20 msecs chunks of quantized audio samples are encapsulated into packets and sent to receiver (every 20 msecs). Justify your answers for the following:

a. How many samples are included in each packet?

b. If the RTP time stamp is initialized to zero, and if the first talk spurt consists of three or more packets, what are the RTP time stamps of the first three packets in the first talk spurt (Hint the time stamps are relative to the first sample)?

c. Consider the last packet in a talk spurt and the first packet in the immediately following talk spurt. Does the difference of the RTP timestamps of these packets depend on the length of the silence period between the two talk spurts?

d. If the last two packets received at the receiver have a timestamps of 0 and 480 and corresponding sequence numbers of 1 and 3 (i.e. packet 2 is lost), are these last two packets in the same talk spurt or in different talk spurts?

e. Outline an algorithm that uses sequence numbers and time stamps of RTP packets to determine the beginning of a new talk spurt?