300-070 · Question #91
Which dial plan function is used to restrict calls that are made by a lobby phone to internal extensions only?
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…
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.
How the community answered
(34 responses)- A6% (2)
- B3% (1)
- C3% (1)
- D88% (30)
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.
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