Witch call control product or feature allows calls to endpoints that are outside of the firewall? Select exactly 1 answer(s) from the following:

Witch call control product or feature allows calls to endpoints that are outside of the firewall? Select exactly 1 answer(s) from the following:

A.
CiscoTelePresenceVCS Expressway

B.
E.164 number and DNS zones

C.
Call policy

D.
Interworking