How are E.164 called-party numbers normalized on a globalized call-routing environment in Cisco Unified Communications Manager?
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A. B. C. D.A.
In a globalized call-routing environment in Cisco Unified Communications Manager, E.164 called-party numbers are normalized to ensure that they can be correctly routed to their destinations. Normalization refers to the process of converting or modifying a phone number so that it conforms to a specific format or pattern.
The correct answer to the question is A: Normalization is achieved by stripping or translating the called numbers to internally used directory numbers.
Here's how this works:
Directory Numbers (DNs) In Cisco Unified Communications Manager, each phone has a Directory Number (DN), which is the internal number that is used to route calls within the system. For example, a user might have a DN of 1000.
Transformation Patterns Transformation patterns are used to normalize E.164 numbers to internal directory numbers. They specify a set of rules that Cisco Unified Communications Manager uses to modify the called number. For example, a transformation pattern might strip the country code from an E.164 number and add a prefix to create an internal DN.
Route Patterns Route patterns are used to specify how calls are routed within the system. They define the dial plan and call routing logic. For example, a route pattern might specify that calls to a certain area code should be routed through a specific gateway.
Calling Search Spaces and Partitions Calling Search Spaces and Partitions are used to control which route patterns are available to specific devices or groups of users. They are used to restrict access to certain routes based on the calling device or user's location.
In summary, to normalize E.164 called-party numbers in a globalized call-routing environment, Cisco Unified Communications Manager uses a combination of directory numbers, transformation patterns, route patterns, and calling search spaces/partitions. The transformation patterns are used to modify the E.164 numbers and translate them to internal directory numbers, which are then used for call routing within the system.