Teams Calling Plans vs Operator Connect vs Direct Routing

Short answer

Choose Calling Plans if you want Microsoft as your carrier and have simple needs, Operator Connect if you want a carrier you pick to manage the connection with no hardware on site, and Direct Routing if you need your own session border controller for legacy devices, complex routing or local survivability. Many organizations mix options by site or country.

Key facts

All three options need a Teams Phone license per user; they differ in who provides the phone numbers and the PSTN connection.
Calling Plans make Microsoft the carrier, with numbers ordered and ported in the Teams admin center.
Operator Connect lets a participating carrier provision numbers into Teams with no customer-managed SBC.
Direct Routing connects Teams to any carrier through a certified session border controller you or a provider runs.
You can mix Calling Plans, Operator Connect and Direct Routing users in the same tenant.

What the three options have in common

Teams Phone is the calling feature set inside Microsoft Teams: a phone number per user, call transfer and park, voicemail, auto attendants and call queues. Every user who makes or receives public phone calls needs a Teams Phone license, either included in their suite or bought as an add-on.

What Teams Phone does not include on its own is the connection to the public switched telephone network (PSTN). That is the choice you are making. Calling Plans, Operator Connect and Direct Routing are three ways to get phone numbers and dial tone into Teams. The user experience in the Teams client is largely the same for all three.

Side-by-side comparison

The right answer usually comes from four questions: who you want as the carrier, whether you need on-site hardware, how complex your routing is, and what devices must keep working.

Factor	Calling Plans	Operator Connect	Direct Routing
Carrier	Microsoft	A participating operator you choose	Any carrier you choose
Hardware	None	None on site; operator runs the SBC	Certified SBC, on premises or hosted
Number management	Teams admin center	Operator provisions into Teams admin center	You or your provider assign numbers in Teams
Routing flexibility	Standard	Standard, plus operator features	Full control with voice routing policies
Analog devices and paging	Not directly	Depends on operator	Supported through the SBC or gateways
Best fit	Small, simple, few countries	Most mid-market sites	Complex, regulated or legacy-heavy sites

When Calling Plans fit

Calling Plans are the simplest path. Microsoft is the carrier, numbers are ordered or ported directly in the Teams admin center, and there is nothing to deploy. Domestic, international and pay-as-you-go options exist, and availability varies by country.

They suit small offices and organizations with straightforward needs: users with direct numbers, a main line into an auto attendant, and a few call queues. They are less suited to sites with fax lines, door phones, overhead paging or contact center platforms that need special handling, and to organizations that want to negotiate carrier rates or keep an existing carrier contract.

When Operator Connect fits

Operator Connect lets you pick a carrier from Microsoft's list of participating operators and connect it from the Teams admin center. The operator runs the session border controllers and the interconnect with Microsoft, then provisions your numbers into the tenant. You assign them to users and resource accounts as normal.

This is often the best balance for mid-market organizations. You keep a carrier relationship and its support model, you avoid owning SBC hardware, and many operators can also handle analog lines, SIP trunks for other systems and number porting. Check which operators cover all your locations before you commit, because coverage and features differ by operator.

When Direct Routing fits

Direct Routing connects Teams to any carrier through a certified session border controller. You configure online PSTN gateways, PSTN usage records, voice routes and voice routing policies, which gives full control over how calls flow.

Pick it when you need things the other options cannot do cleanly: analog devices such as fax, elevator and door phones, paging systems, integration with a contact center or legacy PBX during a phased move, local call survivability at a branch, or a carrier that is not in Operator Connect. The trade-off is that someone must patch, monitor and certify the SBC. A hosted SBC from a provider reduces that burden.

Choose an SBC model and firmware that Microsoft has certified for Direct Routing.
Plan the SBC certificate, public DNS name and firewall rules before go-live.
Decide who monitors SBC health and call quality after handover.

Mixing options and making the decision

You do not need one answer for the whole company. A common pattern is Operator Connect or Calling Plans for most users, with Direct Routing at the one site that has paging, fax or a survivability requirement. Each user is assigned one PSTN connection type.

Make the decision after an inventory of numbers, carriers, contracts, devices and call flows. That discovery also reveals porting constraints and emergency calling work, which affect the timeline as much as the option you choose.

How Accred Consulting approaches it

Accred Consulting starts with discovery: an inventory of every number, carrier contract, site, device and call flow, plus the emergency calling picture for each location. From that we recommend Calling Plans, Operator Connect, Direct Routing or a mix, and explain the trade-offs in plain terms. The proposal sets a clear scope, fixed price and timeline. During delivery, the US-based specialists assigned to your engagement configure Teams Phone, the PSTN connection and routing, run a pilot site first, and hand over documentation so your team can manage numbers and policies afterward.

Track record: 475+ client projects, 2,000+ migration workstreams and 210,000+ users migrated by a US-based team. Company facts · Case studies

Calling Plans, Operator Connect or Direct Routing: which Teams Phone option fits us?