Voice LabTeams Phone

10 · Session border controllers

AudioCodes pattern

Mediant SBCs are common in Teams designs. The pattern is still the shared gate, plus their guide.

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Learn it in 5 minutes

AudioCodes documents Direct Routing for specific Mediant releases, often with their management tools beside the SBC. Use the document that matches the firmware. A 2019 forum post is not that document.

The shared gate still applies: public certificate, verified domain, three proxies, OPTIONS, media ports, a second path, and an emergency test. Their syntax is their problem. Your job is to know which gate failed.

AudioCodes is a certified family. Use their current guide, and do not skip the shared certificate and media gates.

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Visual

Dynamics unified routingWorkstreamClassificationOutagecap 2Billingcap 1Generalcap 0
Language, intent, and capacity for AudioCodes pattern. Overflow is a rule.
Shared gateName · CertificateSignal · 5061Media · PortsHealth · OPTIONS
Same gates for every vendor. Counts in this drawing are teaching order, not customers.

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Worked example

I follow AudioCodes’ current guide for the firmware, and I still check the shared gate.

  1. Firmware Certified
  2. Their guide Current
  3. Shared gate Certificate, DNS, TLS, media
  4. Test Inbound, outbound, failover

If it fails: A forum config is pasted onto new firmware and OPTIONS never get a 200.

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Quiz

A colleague reports: A forum config from 2019 is pasted onto new firmware. Where do you start?

Which description of Ribbon SBC is accurate?

A colleague reports: OPTIONS are answered on the wrong interface. Where do you start?

Flashcards

Ecosystem

Glossary

  • Early offer Teams Direct Routing presents media in the INVITE. An SBC or CUBE that waits for a delayed offer will negotiate badly. Config: Set the vendor profile for early offer toward Teams. Fault: CUCM sends delayed offer all the way to Teams.
  • AudioCodes A certified SBC family. Mediant devices and their management tools are common in Direct Routing designs. The Microsoft certified list is the support boundary, the vendor guide is the config. Config: Follow AudioCodes’ current Teams document for the firmware you run. Fault: A forum config from 2019 is pasted onto new firmware.
  • Ribbon SBC Ribbon’s certified session border controllers are a Direct Routing option. Core and software editions differ. Config: Use Ribbon’s current Teams guide and a public certificate. Fault: OPTIONS are answered on the wrong interface.
  • Oracle SBC Oracle Communications Session Border Controller can be certified for Direct Routing on specific releases. Check the Microsoft list for the release, not the logo. Config: Match the certified software version and the certificate name. Fault: The beautiful config is one release below the certified list.

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

A forum config is pasted onto new firmware and OPTIONS never get a 200.

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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