Client A in X site uses an IP phone to call client B in Y site. Engineers have selected SCCP
as the default VoIP signaling protocol. Which network path will the call signaling take when
client A calls client B?

A.
IP phone X > CUCM subscriber > IP phone Y using TCP port 1000

B.
IP phone X > CUCM subscriber > IP phone Y using TCP port 2000

C.
IP phone X > CUCM subscriber > IP phone Y using UDP port 1000

D.
IP phone X > IP phone Y using TCP port 2000

E.
IP phone X > IP phone Y using TCP port 1000