How does an engineer globalize routing for ingress calls coming from the PSTN to internal DNs?

How does an engineer globalize routing for ingress calls coming from the PSTN to internal DNs?
A . At the PSTN gateway, put the calling number in PSTN format and the called number in DN format.
B . At Cisco Unified CM, put the calling number in E.164 format and the called number in PSTN format.
C . At the PSTN gateway, put the calling number in E.164 format and the called number in localized (DN) format.
D . At Cisco Unified Communications Manager, put the calling number in E.164 format and the called number in E.164 format.

View Answer

Answer: D