300-070 · Question #360
Which option describes destinations that can be routed?
The correct answer is A. DNs located in the partitions inside its calling search space. In CUCM, a device can only place calls to directory numbers (DNs) that reside in partitions included within its assigned Calling Search Space (CSS).
Question
Which option describes destinations that can be routed?
Options
- ADNs located in the partitions inside its calling search space
- BDNs not listed on the restricted dialing list of the device
- CDNs on the allowed list in the ACL of the registered Cisco Unified Communications Manager
- DDNs on the trusted list of the CA within the Cisco Unified Communications Manager cluster
How the community answered
(45 responses)- A93% (42)
- B2% (1)
- C4% (2)
Why each option
In CUCM, a device can only place calls to directory numbers (DNs) that reside in partitions included within its assigned Calling Search Space (CSS).
The CSS acts as an ordered list of partitions that a device is permitted to search when routing calls; any DN placed in a partition outside that CSS is unreachable, making partitions inside the CSS the definitive set of routable destinations.
CUCM does not use a restricted dialing list on devices to control routing; call routing is determined entirely by CSS and partition assignments, not device-level block lists.
ACLs are a network-layer security mechanism and are not part of CUCM's dial plan; CUCM does not use ACLs to define which DNs can be reached.
Certificate Authorities and trusted lists in CUCM govern TLS and security certificate validation, not dial plan routing; they have no role in determining which DNs are routable.
Concept tested: CUCM Calling Search Space and Partition routing
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_0101.html
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