350-801 Question #134: Real Exam Question with Answer & Explanation

Question

When a 8800 series phone is registered over MRA, where does it register?

Options

• ACisco Unified Communications Manager
• BExpressway-C
• CCisco Unified Presence Server
• DExpressway-E

Explanation

An 8800 series phone using MRA leverages Cisco Expressway for connectivity, but it ultimately registers with the Cisco Unified Communications Manager (CUCM) within the corporate network, which is the actual call processing agent.

Common mistakes.

• B. Expressway-C (internal) is a component of the MRA solution that relays registration requests and signaling between Expressway-E and CUCM, but the phone itself does not register to Expressway-C; it registers through it to CUCM.
• C. Cisco Unified Presence Server (now Cisco Unified IM and Presence) handles instant messaging and presence services, not phone registration for call control.
• D. Expressway-E (external) is the internet-facing component of the MRA solution that handles connections from outside the network. Similar to Expressway-C, the phone connects to Expressway-E, but its registration is then proxied through Expressway-E and Expressway-C to CUCM.

Concept tested. Cisco MRA phone registration flow

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/mra/mra_deployment_guide_x12_5.html

No community discussion yet for this question.