350-801 Question #445: Real Exam Question with Answer & Explanation

The correct answer is C: Cisco UCM. When an 8800 series IP phone uses Mobile and Remote Access (MRA), it registers with Cisco Unified Communications Manager (CUCM), which is the call control agent. The Expressway-C and Expressway-E pair facilitate the secure communication path for the registration process but are n

On-Premises Call Control

Question

When an 8800 phone is registered over Mobile and Remote Access, where does it register?

Options

ACisco Unified Presence Server
BExpressway-E
CCisco UCM
DExpressway-C

Explanation

When an 8800 series IP phone uses Mobile and Remote Access (MRA), it registers with Cisco Unified Communications Manager (CUCM), which is the call control agent. The Expressway-C and Expressway-E pair facilitate the secure communication path for the registration process but are not the registration destination themselves.

Common mistakes.

A. Cisco Unified Presence Server (CUPS) handles instant messaging and presence, not IP phone registration for call control.
B. Expressway-E (external) is part of the MRA architecture, handling external connectivity, but it proxies the registration request to Expressway-C, which then proxies it to CUCM; it is not the registration endpoint.
D. Expressway-C (internal) is also part of the MRA architecture, forwarding registration requests from Expressway-E to CUCM, but it is not the entity that actually registers the phone.

Concept tested. Cisco MRA phone registration flow

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-10/mra_deployment_guide_X8-10.html

Topics

#Mobile and Remote Access#Endpoint Registration#Cisco UCM#Cisco IP Phone

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