Which two choices best describe call signaling and media flows? (Choose two.)
A.
a process used to connect two parties calling
B.
audio or video or both transferred between two parties during conversation
C.
protocol for end-to-end users
D.
a flow of audio and instant messaging
E.
all call control signals being delivered through a channel
F.
data telephony, over a data network such as the Internet
Explanation: