Which of the following descriptions of signaling and media during the above call is correct?

Assume that T3 and T4 are two radio terminals registered under the same SC node area (SC enables signaling routing and media routing). After T3 calls T4’s number through the H.323 protocol, T3 and T4 communicate.

Which of the following descriptions of signaling and media during the above call is correct?
A . During the above call process, the Q.931 signaling interaction between T3 and T4 does not go through the SC.
B . During the above call process, the Q.931 signaling interaction between T3 and T4 passes through SC
C . During the above call process, the media interaction between T3 and T4 does not go through the SC.
D . During the above call process, the H.245 signaling interaction between T3 and T4 does not go through the SC.

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Answer: B