Refer to the exhibit. which shows aconfiguration snip from a CiscoUnityExpress module.
Whendoes the gateway address need to be configured on the Cisco Unity Express module?

A.
Only when an MWI server is being used

B.
When a gateway to the PSTN is required

C.
When the gateway address points to the Cisco UnifiedCommunications Manager Express,
which acts as a SIP proxy server, so it is only needed when SIP IP phones are being used.

D.
When the gateway address points to the Cisco Unified CommunicationsManager Express,
which acts as a SIP proxy server, so it is always needed

E.
Only when Cisco Unity Express is serving a remote Cisco Unified Communications Manager
Express