You are the network engineer at domain.com. TestKing has its headquarters in New York and branch offices in Delaware,DetroitandDenver. TestKing has atraditional time-division multiplexing (TDM) based network with automated call distribution (ACD) private branch exchanges (PBX) and desktop systems. You want to add an IP telephony solution to the TestKing network.
What will enable server and agent-level IP telephony to coexist with the existing network?

A.
IPCC

B.
XLD-t

C.
PBX-R

D.
CiscoWorks

E.
Call Manager