Refer to the exhibit.
Which party has a SIP B2BUA role in the call?
A. 172.17.4.100
B. 10.100.4.65 and 172.17.4.100
C. 10.100.4.65
D. None of the parties has a B2BUA role in the call.
E. 10.100.4.68 and 10.100.4.65
Which party has a SIP B2BUA role in the call?