Refer to the exhibit.

An intercluster call was placed from extension 2001 to 3001. The SDI trace from the calling
cluster. Which RTP port was used by the calling phone?

A.
4000

B.
8000

C.
18462

D.
19470

E.
Not possible to tell because a second invite was sent because of call failure

Explanation:
RTP port shows in the logs.