Why This Cheat Sheet Matters for MS-721
This cheat sheet covers the most important Teams Phone and PSTN concepts tested on the MS-721 (Collaboration Communications Systems Engineer) certification exam. It contains 2 sections with 6 key points that you should memorize before exam day. Numbering, policies, PSTN connectivity, and voice routing. Use this as a quick-reference guide during your final review sessions.
2Sections
6Key Points
Connectivity Models
- Compare Calling Plan, Operator Connect, and Direct Routing.
- Align numbering strategy to user/resource account design.
- Define survivability and fallback behavior early.
Routing Controls
- Separate dial plan vs voice route responsibilities.
- Test route precedence with controlled scenarios.
- Audit policy assignment changes.
Practice Teams Phone and Routing Questions
Put your knowledge to the test with practice questions.
Azure Quick Reference Tips
Azure services follow consistent naming patterns that help with exam recall. Resource Manager (ARM) templates use JSON, while Bicep provides a cleaner DSL for infrastructure as code. Remember that Azure resources are organised in a hierarchy: Management Groups → Subscriptions → Resource Groups → Resources.