Voice LabTeams Phone

05 · PSTN connectivity

Operator Connect

You keep a carrier relationship without operating the SBC.

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Learn it in 5 minutes

The operator is enabled in the tenant and assigns numbers. You need Teams Phone. You do not need a Microsoft Calling Plan, and you do not run the SBC. India has a separate operator plan.

Ask the operator which numbers are service numbers for attendants and which are user numbers. A user number that walks out the door with an employee is a publishing problem.

Operator Connect lets a certified carrier run PSTN for Teams Phone users. Do not duplicate it with an SBC unless you mean to.

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Repeated misses take a trunk out of service. The campus does not invent Microsoft's internal counter.
What you still ownSBC · TheirsNumbers · You assignLocations · You still map
The carrier operates the trunk. Counts in this drawing are teaching order, not customers.

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Worked example

Operator Connect is Teams Phone plus a certified carrier. I do not also build an SBC for those same numbers.

  1. Carrier In the program
  2. Enable Tenant
  3. Numbers Assigned
  4. Voice app Service numbers

If it fails: Direct Routing and Operator Connect both claim the same range.

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Quiz

Which description of Direct Routing is accurate?

A colleague reports: The SBC is up and the user has no voice routing policy. Where do you start?

Which description of Mixing PSTN options is accurate?

Flashcards

Ecosystem

Glossary

  • Operator Connect A certified carrier manages PSTN for you inside the tenant. You need Teams Phone. You do not need a Microsoft Calling Plan or your own SBC. Config: Enable the operator in the admin center and assign the numbers they provide. Fault: Someone also builds a Direct Routing SBC for the same numbers and the routes fight.
  • Operator Connect for India The India-specific operator model. It exists because India PSTN rules are not the same as a generic Operator Connect deployment. Config: Use the current India plan article and the licensed operator there. Fault: A UK SBC was proposed as the egress for an India office.
  • Teams Phone Mobile The user’s mobile SIM number is also their Teams number, through a certified mobile operator. Teams Phone is required. Config: Assign the operator number to the user. Do not also treat it as a spare Calling Plan. Fault: One human has two different caller IDs and the CRM matches neither.
  • Direct Routing You connect a certified SBC to Teams and bring your own carrier. Users need Teams and Teams Phone. They must be homed online. Islands mode is not supported. Config: Pair the FQDN, open 5061, allow media ranges, assign a voice route. Fault: The SBC is up and the user has no voice routing policy.

Sister technologies

Around the call: compliance recording, workforce management, emergency location, analytics, CRM screen pop, and an agent with a human escape. Each one has its own failure.

Config and troubleshooting

Direct Routing and Operator Connect both claim the same range.

Cross-platform bridges

CUCM

Cisco CUBE is one of the SBC families named in this lab’s certification lesson. A certified release can be the Direct Routing SBC between Unified CM and Teams.

The tenant still needs a verified domain on the SBC FQDN, and the user still needs Teams Phone. The studio translator does not open a live AXL session. Confirm the current certified release before you build.

Webex

Teams Phone and Webex Calling are separate clouds. This lab does not describe a feature that registers a Webex Calling user into a Teams tenant.

A number move is usually a carrier port, a certified SBC, or a meetings interop product. Confirm before relying.

UCCE

Unified CCE stays the ACD until you migrate it. Microsoft’s contact-center articles name Connect, Extend, and Unify. They do not name a UCCE connector in the notes this lab cites.

Voice into Teams is still Direct Routing or Operator Connect. The routing script stays on the contact-center product you bought. Confirm the vendor’s current model. Source: https://learn.microsoft.com/en-us/microsoftteams/teams-contact-center.

Future hooks

Copilot Studio, Azure Communication Services, and Graph are later tracks in this lab. Treat any uncited limit as confirm before relying.

BridgesEcosystem

Sources and go deeper

Opened 2026-10. A row marked confirm did not open. Wikipedia is background. The Teams blog row is the community index.

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