True or false:
a. If an RTP session has a separate audio and video stream for each sender, then the audio and video streams use the same SSRC.
b. If stored video is streamed directly from a Web server to a media player, then the application is using TCP as the underlying transport protocol.
c. In differentiated services, while per-hop behavior defines differences in performance among classes, it does not mandate any particular mechanism for achieving these performances.
d. In order to maintain registration, SIP clients must periodically send REGISTER messages.
e. When using RTP, it is possible for a sender to change encoding in the middle of a session.
f. Referring to the preceding statement, Alice has indicated in her INVITE message that she will send audio to port 48753.
g. All applications that use RTP must use port 87.
h. SIP mandates that all SiP clients support G.711 audio encoding.
i. Suppose Alice wants to establish an SIP session with Bob. In her INVITE message she includes the line: m=audio 48753 RTP/AVP3(AVP3 denotes GSM audio). Alice has therefore indicated in this message that she wishes to send GSM audio.
J. SIP messages are typically sent between SIP entities using a default SIP port number.
