Choosing a Business Phone System in 2026: Teams Phone, Cloud PBX or Both

Start with the answer: if most of your people already work in Microsoft Teams all day, choose Teams Phone and decide how to connect it to the phone network. If your office depends on a receptionist console, call queues with reporting, analog lines, fax or a contact center, keep or add a cloud PBX and let the two work together. Many offices end up with both, and that is fine when the roles are clear.

What each option is

Teams Phone is the calling feature of Microsoft Teams. Microsoft documentation describes it as the set of capabilities that lets people make, receive and transfer calls with a regular phone number from the same app they use for chat and meetings. Calls work on a computer, a mobile phone or a desk phone certified for Teams.

A cloud PBX, also called hosted voice or UCaaS, is a phone system run by a provider. It gives you extensions, call groups, auto attendants, voicemail and a desktop or mobile app. Some are general purpose. Others are built for a niche such as a front desk, a call center or a medical office.

Three ways to reach the phone network

Microsoft describes three main ways to connect Teams Phone to the public phone network. The first is a Microsoft calling plan, where Microsoft supplies the numbers and the minutes. It is the simplest and has the least flexibility. The second is Operator Connect, where a participating carrier delivers service through the Teams admin center. The third is Direct Routing, where you connect your own carrier or session border controller to Teams. Direct Routing needs the most design work, and it gives the most control over carriers, numbers and special devices.

Availability, countries and features differ by option, so check the current Microsoft Learn pages for your location before you commit. A cloud PBX connects to carriers on its own and hides this choice from you, which is a point in its favor.

When Teams Phone is the better fit

• Staff already use Teams for chat and meetings, and you want one app and one directory.
• Your identity and security controls are in Microsoft 365, and you want calling to follow the same conditional access and device rules.
• Your call needs are plain: a number per person, a few call queues and auto attendants, and voicemail.
• You want fewer vendors to manage.

When a cloud PBX is the better fit

• You have a front desk or dispatch team that needs a busy lamp view, many simultaneous transfers and shared lines.
• You rely on analog devices, door phones, overhead paging, fax or alarm lines.
• You need a full contact center with queues, supervisors, recording and reporting.
• You have many locations and want local numbers and survivability at each one.
• Part of your staff does not use Microsoft 365.

When both make sense

A common pattern is to use Teams for most employees and a cloud PBX, or Direct Routing with a carrier, for the pieces Teams does not do well. For example, executives and office staff use Teams Phone, the front desk keeps a hosted console, and the call center runs on its own platform. Calls move between them through carrier trunks or an integration. The cost is more to manage, so write down which number lives where and who owns each system.

Questions that decide it

• Which numbers must never change, and how long will porting take? Start the port request early, because delays are usually paperwork.
• How will emergency calls work? Check how each system sends a dispatchable location for desk phones, laptops and remote workers, and test it.
• What happens when the internet fails? Ask about failover to mobile, forwarding to a backup number and local survivability.
• What are the headset and desk phone needs? Verify devices are certified for the platform.
• Do you record calls? Check retention and access rules for your industry, including consent rules that differ by state.
• Who supports it at 7 a.m. on a Monday? Pick a model with one accountable party for faults across carrier, network and app.

Network readiness matters more than the platform

Voice over the internet is sensitive to loss, delay and jitter. Before a move, survey the Wi-Fi and the wired network, set quality of service rules on switches and firewalls, and check that the internet circuit has headroom for peak call volume. A second circuit pays for itself the first time the main one fails. Our team designs and operates these networks alongside voice platforms, which is why we start with a readiness check, not a product list.

A sensible path

Inventory every number, device and line type. Decide who needs what. Choose the primary platform, then the carrier path. Pilot with one team for two weeks, test emergency calls and failover, then move the rest in waves, keeping the old system available until the last number is ported. Train staff on the few things they will notice, such as transferring a call and checking voicemail in the app.

Our team can compare Teams Phone, a cloud PBX and a mix for your office, then run the migration and support it after go-live.

Sources

• Microsoft Learn, What is Microsoft Teams Phone?
• Microsoft Learn, Cloud voice and Teams Phone landing page

This article is general information, not legal advice. Standards and vendor documentation change; confirm current requirements with your regulator, counsel and IT provider. Last reviewed November 9, 2026.

Keep reading

Next · SecurityData Loss Prevention for Email: Rules That Catch Exfiltration Without Drowning StaffEmail data loss prevention can stop sensitive data leaving by mistake or on purpose, but only if the rules are narrow, tested and tuned. This article explains how to design Microsoft Purview DLP policies for email so they catch real exfiltration without burying staff in false alarms.5 min read

• SPF, DKIM and DMARC: Why Email Authentication Matters, and How a Resilient Exchange or Microsoft 365 Platform Is Run9 min
• Backups That Actually Restore: 3-2-1, Immutability, Restore Tests and Hurricane Season for Coastal Firms9 min