Teams Phone: Calling Plans vs Operator Connect vs Direct Routing
A practical comparison of the three Teams Phone PSTN connectivity paths most businesses evaluate.
The decision is really about who provides PSTN connectivity and how much control you need
Teams Phone provides the cloud calling capability, but organizations still need a path to the public telephone network for external calling. Microsoft currently documents several connectivity models, including Microsoft Calling Plans, Operator Connect, Teams Phone Mobile, and Direct Routing.
Microsoft Learn: choose a Teams Phone PSTN connectivity option →Microsoft Calling Plans
With Microsoft Calling Plans, Microsoft acts as the PSTN carrier. Microsoft describes this as the simplest all-cloud option for connecting Teams Phone to external calling, subject to country/region availability and licensing.
- You want Microsoft to be the PSTN carrier.
- The required regions and number services are available.
- You value a relatively straightforward cloud-managed model.
Operator Connect
Operator Connect connects Teams Phone to the PSTN through a Microsoft-certified participating operator. The operator manages the PSTN infrastructure while Teams administrators manage users in the Teams admin center. Microsoft specifically positions it as a fit when organizations want managed PSTN connectivity without operating their own SBCs or want to keep working with an existing participating operator.
Microsoft Learn: plan for Operator Connect →Direct Routing
Direct Routing uses a supported customer-provided Session Border Controller to connect Teams Phone to telephony infrastructure. Microsoft describes it as a strong fit for existing carrier relationships, third-party PBX or analog integrations, advanced routing requirements, greater infrastructure control, and complex or multinational deployments.
Microsoft Learn: plan Direct Routing →Quick comparison
| Option | PSTN relationship | Typical reason to consider it |
|---|---|---|
| Calling Plans | Microsoft | Simpler Microsoft-managed PSTN model where available. |
| Operator Connect | Certified operator | Managed carrier model without customer-operated SBCs. |
| Direct Routing | Your carrier / telephony infrastructure | Control, integration, complex routing, existing carrier or PBX requirements. |
The right option depends on geography, carrier strategy, number requirements, existing infrastructure, support model, licensing, and operational complexity. Hybrid combinations can also exist in the same tenant.
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