Microsoft 365 Certified: Collaboration Communications Systems Engineer Associate Advanced Practice Exam: Hard Questions 2025

A multinational company uses Teams Phone with Direct Routing. Users in the US and UK must be able to dial local PSTN numbers, and emergency calls must route to the correct local emergency services with accurate location. The company has multiple SBCs per region and wants automatic failover if an SBC goes down, without changing user calling settings. What is the best design?

Your organization is migrating from Skype for Business to Teams. During coexistence, a subset of executives must have Teams-only calling features (including call delegation and call park) while the rest of the organization remains in Islands mode for phased migration. Executives also need PSTN connectivity via Direct Routing. What is the most appropriate approach?

A company uses Teams Phone with Operator Connect. After enabling Operator Connect numbers, outbound calls to international destinations fail only for users in a specific department. Other departments can dial internationally successfully. Call history shows 'Forbidden' errors. You must resolve the issue with minimal impact. What should you check first?

You manage Direct Routing with multiple SBCs. Inbound calls from PSTN intermittently ring Teams users but fail to connect after answer, and the SBC logs show SIP 481/408 and mid-call re-INVITE issues. Users report it happens more often when they roam between networks and when calls are transferred. What is the most likely root cause to validate first in Teams and SBC configuration?

A financial services company must host quarterly live events for up to 50,000 external attendees. Requirements: moderated Q&A, strict presenter controls, minimal risk of external attendees joining as presenters, and the ability to require attendees to authenticate with their corporate identities from partner organizations. What is the best approach?

Your tenant has strict compliance requirements. For confidential project meetings, recordings must be stored in the correct geographic region and access must be limited to meeting participants. Additionally, transcription should be disabled for these meetings but allowed for standard meetings. What should you implement?

A company deploys Teams Rooms on Windows across 200 sites. After a recent change, a subset of devices intermittently fails to sign in and shows an 'account credentials' error. The resource accounts are synced from on-premises AD to Entra ID. You discover that helpdesk reset passwords and enabled MFA for these accounts. What is the best corrective action to restore stability and align with best practices?

You manage Teams Phones and Teams Rooms devices. Call quality reports show periodic audio drops for a specific model of Teams desk phone only when connected via Wi-Fi. Wired devices are unaffected. The Wi-Fi network uses fast roaming and band steering. What should you do first to isolate the issue using Microsoft tooling and device management capabilities?

Your organization has multiple campuses connected by a WAN. Teams media is hairpinning through the datacenter, causing high latency. You plan to implement Local Breakout for Teams and need to prioritize audio, video, and screen sharing traffic end-to-end. Some sites use SD-WAN that can classify by DSCP but currently rewrites markings. What is the best end-to-end approach?

After deploying QoS, you still see poor video quality for remote users on home networks, while in-office users are fine. Call Quality Dashboard indicates high packet loss on the first hop for remote users. The company wants the most effective mitigation without managing home routers. What should you implement?