What is the difference between Teams Phone and a Calling Plan?

Teams Phone is the phone system, and a Microsoft Calling Plan is one way to buy the phone line that connects it to the outside world. They sit at two different layers, so one does not replace the other, and an organization that wants full business calling usually pays for both.[1][2] Teams Phone is a per-user add-on license that turns Microsoft Teams into a private branch exchange, or PBX, with call-control features such as auto attendants, call queues, and cloud voicemail.[1][4] A Calling Plan is a separate add-on that connects that phone system to the public switched telephone network, or PSTN, so users can dial and receive ordinary landline and mobile numbers, with Microsoft acting as the carrier that supplies the numbers and minutes.[2][3]

Why the two are sold separately

Microsoft keeps the phone system and the phone line as distinct products because a business can connect Teams Phone to the outside network in more than one way. A Microsoft Calling Plan is only one of four PSTN options, alongside Operator Connect, Teams Phone Mobile, and Direct Routing, and some organizations use a third-party carrier instead of buying minutes from Microsoft at all.[3] The documentation itself keeps the license and the connection apart, stating that a PSTN solution is separate from a Teams Phone license and that the license entitles a user to enhanced calling and access to whichever PSTN solution you choose.[1]

When the difference actually matters

Calls between Teams users inside the same organization run over the internet and reach the outside phone network at no point, so they need neither a Teams Phone license nor a Calling Plan.[1] The distinction starts to matter the moment someone needs to call a supplier's landline, a customer's mobile, or an emergency number, because that is when both the phone system and a PSTN connection have to be in place.[1][3]

Teams Phone is Microsoft's cloud phone system, delivered from the same Microsoft 365 platform that runs Teams chat and meetings, and it provides the call-control and PBX features a business would traditionally buy from a separate phone vendor.[1] As a per-user add-on license called Teams Phone Standard, it turns on hosted PBX capabilities such as cloud voicemail, call forwarding, call transfer, auto attendants, call queues, and caller ID.[4] Microsoft lists Teams Phone Standard at $10.00 per user per month on an annual commitment.[6]

What the license adds on top of basic Teams calling

Every Teams Enterprise user can already place person-to-person calls to another Teams user over the internet, along with voicemail and video, without any Teams Phone license.[5] The Teams Phone license is the piece that adds the enterprise call-handling features and, importantly, the ability to answer and place calls to a PSTN phone number or an internal extension rather than only to another Teams user.[5] That is the line Microsoft draws between native Teams calling and Teams Phone: the base license covers internal calling, and the add-on covers the PBX features and external dialing.[5]

What it does not do by itself

A Teams Phone license does not include any minutes to the outside world.[4] It gives a user the right to enhanced calling and access to a PSTN solution, but the actual numbers and the route to landlines, mobiles, and emergency services come from a separate PSTN connection.[1][4]

A Microsoft Calling Plan is Microsoft's all-in-the-cloud PSTN service that connects Teams Phone to the public phone network, with Microsoft acting as your carrier and supplying both the phone numbers and the calling minutes.[2] Microsoft describes it as the simplest option for connecting Teams Phone to the PSTN for external calling, since there is no separate carrier contract to arrange and no voice hardware to run.[2] It carries a 99.999% reliability service level agreement for the PSTN service.[3]

The three Calling Plan types

Microsoft sells Calling Plans in three forms, and you can assign different ones to different users.[2] A Domestic Calling Plan lets a licensed user call numbers in the country where their Microsoft 365 license is assigned, with unlimited incoming minutes and a block of outgoing minutes set by the license.[2] An International Calling Plan adds outbound minutes to numbers in 196 countries on top of the domestic allowance.[2] A Pay-As-You-Go Calling Plan includes unlimited incoming minutes but no outgoing minutes, charging outbound calls per minute through Communication Credits or post-usage billing.[2]

How the minutes pool works

Outgoing minutes are shared rather than fixed per person. All users in the same country on the same Calling Plan draw from one pool, so 100 United States users each allocated 3,000 minutes share a combined 300,000 minutes, and any calls beyond that pool are billed per minute.[2] Pooling only applies across identical Calling Plans, and availability is limited to the countries where Microsoft sells the service, which is the first thing to confirm before planning around it.[2]

A Microsoft Calling Plan makes Microsoft your carrier, so the numbers, the minutes, emergency screening in the United States, and support all come from Microsoft under a 99.999% reliability service level agreement.[3][9] You buy a Calling Plan license per user, pick a Domestic, International, or Pay-As-You-Go option based on how much your users call out, and manage it in the Teams admin center with no hardware to run.[2][3] This tends to fit organizations in a country where Microsoft sells Calling Plans that are content to have a single vendor for both the software and the dial tone.[2][3] Availability is the first thing to check, because Calling Plans are sold in a limited set of countries, so a company outside that list has to use one of the other three connections.[2]

Operator Connect lets you keep or choose a third-party landline carrier that has already built a certified connection into Teams, so you get their numbers and dial tone without running voice hardware yourself.[3] After you pick an operator from Microsoft's directory, you enable them in the Teams admin center and assign their numbers to your users, and that operator provides the PSTN access, support, and service level agreement.[3] This suits a business whose preferred carrier takes part in the program, or one that wants managed calling in a country where Microsoft's own Calling Plan is not sold.[3] Because the operator owns the underlying connection, much of the setup and ongoing management shifts to them, which is usually the point for a team that would rather not run its own telephony.[3]

Teams Phone Mobile ties a user's SIM-enabled mobile number to their Teams identity, so a single number rings on the cell network and inside Teams.[3] It relies on certified mobile operators that have completed the integration with Microsoft, and the mobile SIM, which can be an eSIM, is the piece you administer.[3] This fits mobile-first staff who want one number for the desk, the app, and the handset instead of carrying separate work and mobile lines.[3] Whether it is available depends on your mobile provider taking part in the Teams Phone Mobile program, so confirm that with the carrier before planning around it.[3]

Direct Routing connects a carrier of your choice to Teams Phone through a certified session border controller, or SBC, that you, an integrator, or a Direct-Routing-as-a-Service provider procures and manages.[3] It is the most flexible option and works in any country, which is why organizations pick it to keep an existing carrier contract, meet a local regulatory requirement, or connect legacy equipment such as analog devices, overhead paging, and third-party PBXs.[3] The cost of that flexibility is responsibility, since the SBC brings certificate management, DNS settings, call-routing policies in Teams, and last-mile circuit integration, so it asks more of the IT team or partner running it than the other options do.[3] Direct Routing is also the only model that can keep local PSTN calls working through a Survivable Branch Appliance if the connection to the cloud is interrupted.[3]

A Calling Plan is a PSTN connection, not the phone system itself, and a few common mix-ups are worth clearing up.

It is not another name for Teams Phone

Teams Phone is the phone system, and a Calling Plan is one way to connect it to the outside network.[2][4] You can run Teams Phone with Operator Connect, Teams Phone Mobile, or Direct Routing and never buy a Microsoft Calling Plan, and independent licensing guides describe the same split between the phone-system license and the separate PSTN connectivity.[3][8]

Teams Phone is not a carrier

The Teams Phone license provides the PBX features and the right to reach the PSTN, but it supplies no numbers and no minutes on its own.[1][4] A Calling Plan is what makes Microsoft your carrier, and with three of the four PSTN options a third party rather than Microsoft holds that role.[2][3]

Buying the phone system does not always mean a new license

Some subscriptions already include the Teams Phone license, so the only new purchase is the PSTN connection.[4] Microsoft 365 E5 and Office 365 E5 include Teams Phone, which is why organizations on those plans often add only a Calling Plan or another PSTN option rather than the phone license itself.[4]

A Calling Plan is not required for internal calls

Calls between Teams users in the same organization run over the internet and never touch the PSTN, so they work with no Calling Plan and no Teams Phone license at all.[1]

The choice between buying a Calling Plan and using another PSTN option turns on where you can get service, how much of the connection you want to run yourself, and what it costs. Each has limits worth planning around.

Calling Plan coverage is uneven

Microsoft sells Calling Plans in a limited set of countries, so a company with offices outside that list often ends up combining connectivity types by region, using a Calling Plan where it is available and Operator Connect or Direct Routing elsewhere.[2][3]

Pooled minutes can run out

Calling Plan minutes are shared across users in the same country and reset monthly, and calls beyond the pool are billed per minute, so a team that calls out heavily can see overage charges if the allowance is set too low.[2] An International or Pay-As-You-Go plan changes that math, and a Pay-As-You-Go plan has to be funded with Communication Credits or post-usage billing before outbound calls will connect.[2]

The license is not the whole bill

A Teams Phone license on its own cannot call the outside world, so the working cost includes both the license and a PSTN option, whether that is a Microsoft Calling Plan, an Operator Connect subscription, or the SBC and carrier contract behind Direct Routing.[3][4] Independent pricing guides current to 2026 put Teams Phone Standard at about $10 per user per month and the Teams Phone with Calling Plan bundle at about $17, before any per-minute overage.[7]

Both depend on internet and power

Because external calls travel as data, calling through any of these options needs a working internet connection and power at the user's location, unlike a legacy analog line that draws power from the phone company.[3]