MS-721 Cheat Sheet 2026: Quick Reference for Collaboration Communications Engineers
All 4 domains as scannable tables, updated for Microsoft's April 2026 skills revision, plus a PSTN decision table, acronym glossary, and cmdlet reference.
Quick Facts
Every domain weight and reference link below is pulled directly from Microsoft's official MS-721 exam page and cross-checked against our 500-question MS-721 bank, which we audit against Microsoft Learn documentation before anything goes live.
Domain 1: Plan and Design Collaboration Communications Systems (20-25%)
| Concept | Sub-area | Quick note |
|---|---|---|
| Meeting/webinar/town hall/virtual appointment selection | Meeting planning | Recommend the right format by audience size and interaction need |
| Teams Premium & Copilot recommendation | Meeting planning | Added in the current guide — know when Premium/Copilot features justify the license |
| Teams Phone licensing by endpoint type | Phone planning | Users, shared devices, and resource accounts each need a distinct license |
| Calling Plan vs. Operator Connect vs. Direct Routing vs. Teams Phone Mobile | Phone planning | Core PSTN decision — see the decision table below |
| Shared Calling | Phone planning | A lighter-weight licensing model for occasional shared-use lines, distinct from a full Calling Plan |
| Billing method: domestic, international, PAYG | Phone planning | Recommend based on the org’s actual call volume pattern |
| Survivable Branch Appliance (SBA) | Phone planning | Recommended when a branch site needs local PSTN failover during a WAN outage |
| Room interoperability: CVI, Direct Guest Join, SIP Guest Join | Device planning | Three distinct ways a non-Teams device or guest joins a Teams Room meeting |
| Intune enrollment for AOSP vs. Windows Rooms | Device planning | Two separate enrollment paths depending on the Rooms platform |
| Network readiness: Network Assessment Tool, Network planner, QoS, MBR, eCDN | Network planning | eCDN specifically offloads WAN load for large live events, not everyday meetings |
Domain 2: Configure and Manage Teams Meetings, Webinars, and Town Halls (15-20%)
| Concept | Sub-area | Quick note |
|---|---|---|
| Meeting policies & controlled-content policies | Meetings | Controlled-content policies restrict attendee actions in sensitive meetings |
| Meeting templates & template policies | Meetings | Standardize recurring meeting types across the org |
| Cloud Video Interop (CVI) policies | Meetings | Lets certified third-party room devices join a Teams meeting |
| Virtual appointments & advanced policies | Meetings | Scheduled 1:1 customer-facing meetings — think healthcare or retail bookings |
| Audio Conferencing bridge & toll-free numbers | Audio conferencing | Default bridge vs. a specific number assigned per user |
| Webinar roles & in-org vs. public access | Webinars | Public webinars allow external registration; in-org restricts to the tenant |
| Town hall + eCDN + Viva Engage/Stream integration | Town halls | eCDN is called out specifically for town-hall-scale distribution |
Cross-referencing while you study?
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Start Free MS-721 PracticeDomain 3: Implement and Configure Teams Phone (30-35%)
Microsoft renamed this domain from "Configure and manage Teams Phone" in the April 2026 update — the weighting stayed the largest on the exam.
| Concept | Sub-area | Quick note |
|---|---|---|
| Dial plans, calling policies, IP Phone policies | Phone policies | A broader policy set than just voice routing — covers call handling behavior per user |
| Private lines | Phone policies | A second private number on a line that already has a shared appearance |
| Shared Calling policies | Phone policies | Governs the shared-line licensing model introduced in Domain 1 |
| Auto attendants, call queues, and the Queues app | Call routing | The Queues app gives agents a dedicated UI for managing their queue |
| Callback for call queues | Call routing | Lets a caller keep their place in line without staying on hold |
| Emergency locations, LIS, dynamic address validation | Emergency calling | LIS (Location Information Service) ties a network location to a civic address |
| PSTN gateway, PSTN usage, voice routes, voice routing policy | Direct Routing | The core Direct Routing configuration chain, in dependency order |
| LBR and LMO use-case identification | Direct Routing | Current guide frames both as “identify use cases,” not deep configuration steps |
| Trunk translation rules | Direct Routing | Number manipulation applied between the SBC and Teams |
| SBA policies | Direct Routing | Governs Survivable Branch Appliance failover behavior at a branch site |
Domain 4: Configure and Manage Teams Rooms and Devices (20-25%)
| Concept | Sub-area | Quick note |
|---|---|---|
| Teams Rooms Pro Management portal | Management | Central device inventory, peripheral health, and firmware management |
| Entra Conditional Access MFA exceptions for resource accounts | Management | Resource accounts typically can’t complete an interactive MFA challenge |
| SIP Gateway & SIP device provisioning | Devices | Bridges third-party SIP phones into Teams authentication |
| AOSP vs. MDEP Intune enrollment | Devices | Two distinct enrollment paths for Android-based Teams devices |
| Proximity join, Direct Guest Join, room remote | Devices | Different join mechanics depending on whether the user is in-room or a guest |
| Content camera, HDMI ingest, Teams casting | Devices | AV input options available on Teams Rooms hardware |
| Hot desking | BYOD/shared spaces | Lets any user sign in to a shared device with their own identity temporarily |
| Bookable desks & room types | BYOD/shared spaces | Desk booking is managed alongside Rooms now, not as a separate system |
| AI-enabled voice/video capabilities | Devices | Intelligent speaker recognition and framing for shared-space devices |
New in the April 2026 Skills Update
Comparing the current skills-measured list against MS-721's prior objectives (per Microsoft's own change log, checked August 4, 2026), these items are additions — worth a specific look if you studied from older material:
- • Teams Premium & Microsoft 365 Copilot recommendation scenarios (Domain 1)
- • Shared Calling as a licensing model, in both planning (Domain 1) and policy configuration (Domain 3)
- • Private lines — a second private number on a shared-appearance line (Domain 3)
- • Survivable Branch Appliance (SBA) planning and SBA policies (Domains 1 & 3)
- • Virtual appointments and advanced virtual appointment policies (Domain 2)
- • Policy packages as a method for assigning policies at scale (Domain 1)
- • The Queues app for call-queue agents (Domain 3)
- • Cloud Video Interop, Direct Guest Join, and SIP Guest Join as three distinct room interoperability paths (Domains 1 & 2)
- • Hot desking and bookable desks for BYOD shared spaces (Domain 4)
- • AI-enabled voice/video capabilities for shared-space devices (Domain 4)
PSTN Connectivity Decision Reference
| Scenario | Use this |
|---|---|
| Microsoft should own the entire numbering and trunk relationship, simplest setup | Microsoft Calling Plan |
| Keep an existing certified carrier without deploying your own SBC | Operator Connect |
| Need full control of SBC hardware/software, existing carrier contracts, or custom routing (LBR/LMO) | Direct Routing |
| Need SIM-based mobile numbers to serve as the user’s Teams number | Teams Phone Mobile |
| A branch site must survive a WAN outage with local PSTN failover | Direct Routing + a Survivable Branch Appliance (SBA) |
| Low-cost, occasional shared-use lines (e.g., a warehouse handset) | Shared Calling |
MS-721 Acronym Glossary
| Acronym | Stands for | What it means on the exam |
|---|---|---|
| SBC | Session Border Controller | Connects a Direct Routing deployment to the PSTN carrier |
| SBA | Survivable Branch Appliance | Local failover device keeping a branch site on PSTN during a WAN outage |
| LBR | Location-Based Routing | Forces calls through a local gateway based on the user’s network location |
| LMO | Local Media Optimization | Keeps call media local across internal SBCs at different sites |
| LIS | Location Information Service | Maps network locations to civic addresses for emergency calling |
| CVI | Cloud Video Interop | Lets certified third-party video room devices join a Teams meeting |
| AOSP | Android Open Source Project | The OS base for Android-mode Teams Rooms and Teams Panels |
| MDEP | Microsoft Device Ecosystem Platform | Manages certified Android-based Teams devices |
| PSAP | Public Safety Answering Point | The destination that answers an emergency call |
| PAYG | Pay-As-You-Go | A communications-credit billing model for calling |
| MBR | Media Bit Rate | Controls the bandwidth consumed per call |
| eCDN | Enterprise Content Delivery Network | Offloads WAN load for large live events and town halls |
| CQD | Call Quality Dashboard | Tenant-wide call quality reporting tool |
| QoS | Quality of Service | Network traffic prioritization for real-time voice/video media |
PowerShell Cmdlet Quick Reference
The exam scores end results, not method — but scenario questions that ask "which cmdlet" directly reward knowing these by name.
| Cmdlet | Task | Note |
|---|---|---|
| New-CsOnlinePSTNGateway | Register a Direct Routing SBC with Teams | Configured in the Teams admin center under Direct Routing |
| New-CsOnlinePstnUsage | Create a PSTN usage record | A named bundle of voice routes referenced by a voice routing policy |
| New-CsOnlineVoiceRoute | Create a voice route | Maps a dialed-number regex pattern to a PSTN usage and gateway list |
| New-CsOnlineVoiceRoutingPolicy | Create a voice routing policy | Assigned to users; contains one or more PSTN usages |
| Set-CsPhoneNumberAssignment | Assign a phone number to a user or resource account | The current cmdlet for number assignment across Calling Plan, Operator Connect, and Direct Routing |
| New-CsCallQueue | Create a call queue | Sets routing method, agent list, overflow, and timeout behavior |
| New-CsAutoAttendant | Create an auto attendant | Configures menu options, business-hours schedule, and call flow |
| Set-CsTeamsEmergencyCallingPolicy | Configure emergency calling notifications | Sets notification mode and recipient group |
| Set-CsTeamsEmergencyCallRoutingPolicy | Configure Direct Routing emergency routing | Maps emergency dial strings to emergency-specific PSTN usages |
| New-CsTeamsCallParkPolicy | Create a call park policy | Governs hold/retrieve behavior for parked calls |
What People Ask About MS-721
Is this cheat sheet different from the full MS-721 study guide?
Yes. The study guide walks through Direct Routing, SBC certificates, and voice-route regex in narrative depth across an 8-week plan. This page strips the narrative for tables you can scan in the last hour before the exam, and adds coverage of the April 2026 skills update that the study guide predates.
What changed in the April 2026 MS-721 skills update?
Microsoft added Teams Premium and Microsoft 365 Copilot recommendations, Shared Calling, private lines, Survivable Branch Appliance (SBA) planning, virtual appointments, policy packages, the Queues app, Cloud Video Interop and guest-join options, and hot desking/bookable desks for shared spaces — none of which existed in earlier versions of the skills-measured list.
Why did Domain 3 change from "Configure and manage Teams Phone" to "Implement and configure Teams Phone"?
Microsoft renamed the domain in its skills update but kept the weighting at 30-35%, still the largest single domain on the exam. The rename reflects added implementation-focused items like trunk translation rules and SBA policies alongside the existing configuration tasks.
Do I need to know Teams Premium and Copilot in depth for MS-721?
The skills-measured list frames it as a recommendation task — knowing when Teams Premium or Copilot features (like intelligent meeting recaps) justify the license for a given scenario, not configuring every Premium feature in depth.
What is Shared Calling and is it tested?
Shared Calling is a licensing model for occasional or shared-use phone lines — think a single warehouse handset several people use — that costs less than assigning each person a full Calling Plan. It appears in both the planning domain (Domain 1) and the policy-configuration domain (Domain 3).
Can I print this MS-721 cheat sheet?
Yes — every table here is plain HTML, so a browser print or "print to PDF" renders cleanly.
MSCertQuiz sells practice-exam access for MS-721 and other Microsoft certifications; this cheat sheet is written by the same team that builds and maintains those questions.
Where to Go Next
The full 8-week plan behind this quick reference.
15 scenario questions with detailed explanations.
Voice specialist vs. general Teams admin — which to take first.
Full exam details and the complete 500-question practice bank.
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