Which two configurations are likely causing this issue?

An administrator is configuring a new FortiVoice system and is having trouble with outbound and external inbound calls. The network administrator has verified that Internet connectivity is stable and the FortiVoice system can reach the Internet. Local extension calls are also working without any issue.

Which two configurations are likely causing this issue? (Choose two.)
A . Office Peers
B . DID mapping
C . VoIP Trunk
D . Inbound call routing

Answer: A,D