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:

You have a clent 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.
multipointcontrol unit

C.
gatekeepers

D.
streaming solutions

E.
gateway

F.
firewall traversal solution