300-070 Question #91: Real Exam Question with Answer & Explanation

The correct answer is D. Calling privileges.. Calling privileges control what destinations a phone is allowed to call. In CUCM, this is implemented via Partitions and Calling Search Spaces (CSS): a lobby phone is assigned a CSS that only includes the partition containing internal directory numbers, blocking it from reaching

Gateway and Dial Plan

Question

Which dial plan function is used to restrict calls that are made by a lobby phone to internal extensions only?

Options

APath selection.
BEndpoint addressing.
CManipulation of dialed destination.
DCalling privileges.

Explanation

Calling privileges control what destinations a phone is allowed to call. In CUCM, this is implemented via Partitions and Calling Search Spaces (CSS): a lobby phone is assigned a CSS that only includes the partition containing internal directory numbers, blocking it from reaching PSTN or long-distance routes. Path selection determines which physical route (gateway) a call uses. Endpoint addressing assigns directory numbers and URIs to devices. Manipulation of dialed destination (translation rules/transformations) modifies digits but does not inherently restrict access. Restricting a lobby phone's outbound reach is a calling privilege (CSS/partition) function.

Topics

#calling privileges#call restrictions#lobby phone#dial plan

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