Microsoft Teams Phone: Turn Microsoft 365 into Your Complete Business Phone System

In 2026, the traditional office desk phone is rapidly becoming a relic of the past. Microsoft Teams Phone has emerged as a full-featured cloud-based phone system that integrates seamlessly into the Microsoft 365 ecosystem — letting you make and receive calls, manage voicemail, set up call queues, and even handle external PSTN calls, all from within the Teams app on your laptop, tablet, or mobile device. This guide will walk you through everything you need to know to get the most out of Teams Phone in your organisation.

What Is Microsoft Teams Phone?

Microsoft Teams Phone (formerly Teams Phone System) is a cloud-hosted Private Branch Exchange (PBX) solution built directly into Microsoft Teams. It allows organisations to replace traditional on-premises phone hardware with a software-based system that lives in Microsoft's cloud.

Key capabilities in 2026 include:

Making and receiving calls over the public switched telephone network (PSTN)

Transfer, hold, park, and forward calls between users

Auto attendants and interactive voice response (IVR) menus

Call queues for routing calls to available agents

Voicemail with AI-powered transcription

Call recording and compliance features

Teams Phone Mobile for SIM-enabled calling

How Teams Phone Connects to the Outside World

Teams Phone requires a connection to the PSTN — the global telephone network — to make and receive calls from regular phone numbers. In 2026, Microsoft offers several options:

Microsoft Calling Plans

Microsoft provides the phone numbers and PSTN connectivity directly. This is the simplest setup — no additional hardware or carrier contracts required. Calling Plans are available in most major countries and include domestic and/or international calling minutes.

Operator Connect

Your preferred telephone carrier connects directly to Microsoft Teams via a certified Microsoft partnership. This allows organisations to keep their existing carrier relationships while moving to Teams Phone. The configuration is done entirely within the Teams Admin Center — no on-premises hardware required.

Direct Routing

For maximum flexibility, Direct Routing lets you connect any SIP-capable carrier to Teams Phone via a Session Border Controller (SBC). This is ideal for large enterprises with complex telephony requirements, existing carrier contracts, or specialised compliance needs.

Setting Up Teams Phone: A Step-by-Step Overview

The exact steps depend on your chosen PSTN connection method, but here is the general flow for most organisations using Operator Connect or Calling Plans:

Assign Teams Phone licences to users in the Microsoft 365 Admin Center.

In the Teams Admin Center (admin.teams.microsoft.com), navigate to Voice > Phone numbers and acquire or port your numbers.

Assign phone numbers to users under Voice > Phone numbers > Edit user.

Enable voicemail and configure voicemail greetings under Voice > Voicemail policies.

Set up an Auto Attendant under Voice > Auto attendants for your main company number.

Create Call Queues under Voice > Call queues to distribute incoming calls to teams.

5 Features That Make Teams Phone Stand Out in 2026

1. AI-Powered Voicemail Transcription

Every voicemail left for a Teams Phone user is automatically transcribed using AI and delivered to their email inbox and Teams chat. The transcription highlights caller name (if recognised), key information, and sentiment — so you can triage messages without listening to audio.

2. Copilot in Teams Phone Calls

When Copilot is enabled for your organisation, it joins your Teams Phone calls in real time and provides live call summaries, suggested responses, and follow-up action items — just like it does for Teams meetings. This is particularly valuable for sales and customer service teams.

3. Teams Phone Mobile

Teams Phone Mobile allows a single phone number to ring on both a user's corporate mobile SIM and their Teams app simultaneously. This is ideal for employees who travel or work remotely — clients always reach them on one number, and calls are fully integrated into Teams.

4. Call Queue Analytics

The Teams Admin Center now includes rich analytics for call queues and auto attendants — showing call volume, wait times, abandonment rates, and agent performance. This data is visualised in Power BI dashboards and can be used to optimise staffing and improve customer experience.

5. Survivable Branch Appliance (SBA) Support

For locations with unreliable internet connectivity, Teams Phone supports Survivable Branch Appliances — local hardware that maintains basic calling functionality even when the Azure cloud is unreachable. This ensures business continuity for critical operations.

Teams Phone vs. Traditional PBX: Is It Time to Switch?

For most small to medium-sized businesses, the answer is yes. Teams Phone eliminates the cost of hardware maintenance, physical handsets, and complex on-premises PBX administration. Licencing costs are predictable (per-user per-month), and the system scales instantly as headcount changes.

Larger enterprises benefit from advanced features like Direct Routing integration, compliance call recording, and Teams Phone Mobile — capabilities that rival traditional enterprise telephony at a fraction of the cost and complexity.

Common Teams Phone Tips and Tricks

Pin your Calls tab in Teams to access your dial pad and call history quickly.

Use the /call slash command in Teams to dial a number directly from the message bar.

Set your Quiet Hours in the Teams mobile app to stop calls during non-work hours.

Enable simultaneous ring in your Teams calling settings to ring your mobile phone at the same time as your Teams app.

Use Park and Retrieve to hold a call on one device and pick it up on another.

Conclusion

Microsoft Teams Phone in 2026 is a mature, feature-rich business phone system that is fully integrated with your Microsoft 365 environment. Whether your organisation is looking to replace an aging PBX, consolidate communication tools, or enable hybrid workers with seamless calling, Teams Phone delivers a compelling solution without the complexity of traditional telephony infrastructure.

Start your journey by speaking with your Microsoft partner or IT administrator about licencing options and migration planning. Visit the Microsoft Teams Phone documentation on Microsoft Learn for in-depth technical guidance and the latest feature updates.