300-070 Question #360: Real Exam Question with Answer & Explanation

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

Explanation

In CUCM, a device can only place calls to directory numbers (DNs) that reside in partitions included within its assigned Calling Search Space (CSS).

Common mistakes.

B. 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.
C. 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.
D. 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

Reference. 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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