In which two situations would a voice gateway be required? (Choose two.)
A.
To connect a corporate or branch location to an IP WAN
B.
To connect a corporate or branch location using VoIP to the PSTN
C.
To connect a Cisco Unified Communications Manager to a LAN
D.
To connect a Cisco Unified Communications network to a PBX
E.
To connect a corporate or branch location to a MAN