You have a client who already has an effective system for making IP calls within the
organization. Yhe client would now like to contact external companies that are using
IP-based technology, which component should you suggest? Select exactly 1 answer(s)
from the following:

A.
SIP rgistrar

B.
firewall traversal solution

C.
gateway

D.
multipointcontrol unit

E.
gatekeepers

F.
streaming solutions