Refer to the exhibit. The user of IP phone A has opened a trouble ticket that he cannot call IP
phone B. where is the best place for troubleshooting this issue.
A.
IP phone B
B.
The Cisco Unified Communication Manager system in the site A
C.
IP phone A
D.
IP phone A user
E.
The local VoIP voice gateway of IP phone B
F.
IP phone B user