210-060 · Question #122
An engineer needs to block any outbound calls to specific numbers. Which dial plan element is used to restrict called numbers?
The correct answer is D. calling search space. A Calling Search Space (CSS) restricts which partitions a device can reach, allowing an engineer to block outbound calls to specific numbers by excluding the relevant partition.
Question
An engineer needs to block any outbound calls to specific numbers. Which dial plan element is used to restrict called numbers?
Options
- Apartition
- Broute group
- Croute list
- Dcalling search space
How the community answered
(47 responses)- A2% (1)
- B4% (2)
- C9% (4)
- D85% (40)
Why each option
A Calling Search Space (CSS) restricts which partitions a device can reach, allowing an engineer to block outbound calls to specific numbers by excluding the relevant partition.
A partition is a logical container for DNs and route patterns - it organizes dialable destinations but does not itself enforce restrictions on callers.
A route group is a collection of gateways or trunks used for outbound call routing and has no role in restricting which numbers a device can dial.
A route list is an ordered list of route groups used to select an outbound path - it determines how a call is routed, not whether it is permitted.
A Calling Search Space is assigned to a device or line and defines the ordered list of partitions that device is allowed to dial into. By removing or excluding a partition containing an unwanted route pattern from the CSS, outbound calls to those numbers are effectively blocked.
Concept tested: CUCM calling search space for outbound call restriction
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1/systemConfig/cucm_b_system-configuration-guide-1251/cucm_b_system-configuration-guide-1251_chapter_010001.html
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