How are E.164 called-party numbers normalized on a globalized call-routing environment in Cisco Unified Communications Manager?
A. Normalization is achieved by stripping or translating the called numbers to internally used directory numbers.
B. Normalization is achieved by setting up calling search spaces and partitions at the SIP trunks for PSTN connection.
C. Call ingress must be normalized before the call being routed.
D. Normalization is not required.
A is correct. Follow link below and view the called-party section of the topic.
https://community.cisco.com/t5/collaboration-voice-and-video/basics-of-globalized-call-routing/ta-p/3121674
Answer should be C. On a globalized call-routing environment you have to normalize all incoming calls to +E164 Numbers. Even if a User or a system dials a number in an non E164-Format you have to normalize before routing the call.
Answer is D.
Key words to listen to “On a globalized call-routing environment”