- •Operator Connect simplifies deployment but limits architectural control. It is the right choice for standardized deployments with lean IT teams and no contact center or AI voice requirements.
- •Direct Routing provides full routing control, supports contact center and AI voice integration, and allows multi-carrier configurations, at the cost of more setup and management complexity.
- •Hybrid deployments, Operator Connect for standard users and Direct Routing for contact center and AI voice, are supported natively in Teams and represent the best of both architectures for many enterprises.
- •The real constraint of Operator Connect is not carrier switching. It is application lock-in. The network points only to Teams, which eliminates flexibility to route traffic to other applications without porting numbers.
This is the question that comes up in almost every enterprise Teams voice conversation. The short answer is that neither option is universally better. They are different architectures designed for different organizational profiles.
The longer answer, which is the one that actually helps you make the right decision, requires understanding what each model does and does not give you control over. Most organizations get this wrong because they evaluate the two options based on setup cost and per-minute rates rather than the architectural implications that follow for the life of the deployment.
What Each Option Actually Is
Operator Connect is Microsoft's certified carrier program. Carriers that meet Microsoft's requirements are listed in the Teams Admin Center, and IT administrators can provision PSTN calling by selecting a carrier and purchasing numbers directly through the interface. The carrier manages the network connection to Microsoft's infrastructure. You manage the Teams side. The carrier integration itself is handled by Microsoft.
Direct Routing is SBC-based PSTN connectivity that you control. You or your carrier provisions an SBC, registers it with your Teams tenant, and routes calls through it. Microsoft provides the Teams platform and the SIP interface specification. Everything else, carrier selection, SBC configuration, routing policies, failover architecture, lives outside the Microsoft ecosystem and is your responsibility to manage.
Side-by-Side Comparison
| Operator Connect | Direct Routing | |
|---|---|---|
| Setup complexity | Low. Provisioned entirely through Teams Admin Center. | Moderate to high. Requires SBC configuration and carrier coordination. |
| Carrier choice | Limited to Microsoft-certified Operator Connect carriers. | Any carrier with a compatible SBC or Direct Routing service. |
| Customization | Limited. Routing is managed by the carrier. | Extensive. Full control over routing policies, failover rules, and call treatment. |
| SLA ownership | Split between Microsoft and the OC carrier. | Carrier-defined. Your SLA is with your Direct Routing provider. |
| Cost model | Typically bundled per-user or per-minute through OC pricing. | Carrier rate-based. More negotiating room at scale. |
| Best for | SMB to mid-market, standardized deployments, lean IT teams. | Enterprise, multi-carrier, contact center, international complexity, AI voice. |
Where Operator Connect Wins
Operator Connect is the right choice for organizations that need straightforward PSTN calling without the overhead of managing a separate carrier relationship and SBC infrastructure. If you have a lean IT team, a standardized user population with no complex routing requirements, and no plans to run contact center or AI voice workloads on the same infrastructure, Operator Connect delivers a clean and manageable deployment.
Setup is genuinely fast. The carrier integration is pre-validated. Microsoft provides first-line support for provisioning issues. The simplicity argument is legitimate. Not every enterprise needs the control that Direct Routing provides, and building complexity into a deployment that does not require it creates maintenance overhead without corresponding value.
Where Direct Routing Wins
Direct Routing is the right architecture when your requirements exceed what Operator Connect's fixed model can accommodate.
Custom routing is the most common driver. If you need to route calls based on dialed number, user location, time of day, or business unit, Direct Routing's voice routing policies provide that granularity. Operator Connect does not.
Contact center integration is another. Most enterprise contact center platforms, Five9, Genesys, NICE, Avaya, integrate with Microsoft Teams through Direct Routing. The SBC sits at the junction between Teams and the contact center, handling call handoff and routing logic. Operator Connect does not support this architecture.
AI voice workloads require the same thing. An AI voice agent running alongside Teams Phone needs carrier-grade infrastructure underneath it. The application-agnostic routing that allows you to add, swap, or run multiple AI voice applications simultaneously, without porting numbers or rebuilding call flows, is a Direct Routing capability, not an Operator Connect capability.
At scale, cost also shifts. Operator Connect pricing is typically structured around per-user or per-minute rates set by the certified carrier. Direct Routing allows you to negotiate carrier rates independently and select the right provider for each traffic type. For enterprises with significant call volume, that flexibility translates into meaningful per-minute savings.
The Hybrid Option
The two architectures are not mutually exclusive. A growing number of enterprise deployments run Operator Connect for standard users, the 80% of the organization with straightforward PSTN needs, and Direct Routing for contact center agents, AI voice workloads, and the specialized populations that need more control.
Microsoft supports this configuration natively. Voice routing policies in Teams Admin Center can direct specific users or number ranges to specific routes. You can provision OC users and Direct Routing users within the same tenant without conflict, as long as the routing policies are clearly defined.
This hybrid model often makes sense during migrations as well. Operator Connect can handle the broad user base while a Direct Routing environment is built and validated for the contact center and AI voice workloads. Once the DR environment is stable, there is no urgency to move standard users off OC if it is serving them well.
How Teams Plus Fits
Teams Plus provides carrier-grade Direct Routing for enterprises that need more control, more flexibility, or more performance than Operator Connect provides.
The critical distinction is architectural. With Operator Connect, the network points exclusively to Microsoft Teams. If you want to route some traffic to a contact center, run an AI voice agent alongside Teams users, or eventually move a subset of users to a different application without porting their numbers, Operator Connect does not support it. With Direct Routing, that flexibility exists by design.
We have deployed 400+ Teams Phone environments since 2019. The pattern we see consistently is that organizations underestimate how quickly their requirements evolve past what Operator Connect can handle. Contact center integration gets added. An AI voice project gets approved. An acquisition brings a different UC platform into scope. Direct Routing's flexibility is not just a present-tense benefit. It is what keeps you from rebuilding the voice architecture when requirements change.
