The MS-721 Collaboration Communications - System Engineer: 1500 Certified Questions course is designed to give you a clear, system-focused path through Teams Voice, Rooms and devices, PSTN connectivity, call routing, monitoring and secure collaboration. Every question is framed around realistic collaboration and voice scenarios, so you can connect each concept directly to how modern Microsoft 365 environments are built and operated.

The course contains 1,500 certified-style questions divided into six sections of 250 questions each, aligned with the responsibilities of a system engineer working on collaboration communications.

You begin with Teams Collaboration & Voice Architecture Foundations — 250 Questions, where you position Teams in the wider Microsoft 365 ecosystem and understand how identity, storage and policies support collaboration and voice features.

The second section, PSTN Connectivity, Teams Phone & Call Routing Design — 250 Questions, focuses on Teams Phone and PSTN connectivity strategies, helping you design numbering, call flows and routing models that align with geography, regulation and enterprise requirements.

In the third section, Teams Rooms, Collaboration Devices & Meeting Space Engineering — 250 Questions, you concentrate on room and device engineering, shaping meeting spaces and device strategies that deliver stable, professional collaboration experiences.

The fourth section, Call Policies, Dial Plans, Auto Attendants & User Voice Profiles — 250 Questions, turns to policies, dial plans and auto attendants, showing how you can tailor voice behavior to different user profiles while keeping central control.

The fifth section, Monitoring, Analytics, Troubleshooting & Quality Engineering — 250 Questions, builds your skills in reading platform signals, analyzing call quality concepts and troubleshooting collaboration and voice incidents with data rather than guesswork.

Finally, the sixth section, Secure Collaboration, External Access, Governance & Operations — 250 Questions, connects collaboration, security and governance, showing how external access, sharing policies and lifecycle rules keep collaboration environments secure, compliant and manageable over time.

Each practice test can be retaken as many times as you need, helping you track and enhance your progress, reinforce weaker domains and build structured confidence. Whether you are aligning to MS-721-style collaboration communications objectives or engineering Teams-based collaboration and voice systems in production, this course gives you a clear, section-based route to advanced system engineering skills in collaboration communications.