What do I need to do to get Microsoft Teams working with a SIP Proxy?

Our SIP Proxy, Cloud PBX, SIP Trunk and DID products can be combined to give you a full in office and remote working telecoms solution through Microsoft Teams. The SIP Proxy acts as a Session Border Controller (SBC) point of integration between Microsoft Teams and your PBX securely transmitting calls to and from the end users.

This allows your end users to not only use the standard Microsoft Teams meeting and collaboration functions but to also make and receive all their business calls to the outside world through the same application (Microsoft Teams desktop app, Microsoft Teams mobile app or both)

To enable Microsoft Teams to work with your PBX solution there are some prerequisites and configuration steps needed with your Microsoft Teams implementation

  1. Microsoft Phone System Licence - your Microsoft Office 365 account needs to have a Phone System licence. This is standard on Office 365 E5 licence levels but will need to be purchased as an addon on lower cost licence types.
  2. SIP Proxy Domain - Microsoft mandate that the SIP Proxy has a fully qualified domain name (FQDN) matching your domain as hosted in Office 365. For example, if your domain hosted in Office 365 for email is yourdomain.com then a suitable domain name for SIP Proxy would be sbc.yourdomain.com
  3. Each end user you wish to make and receive calls needs a full inbound direct dial number (DID). We can supply you with these DID numbers which you can choose on checkout.
  4. Direct Routing needs to be enabled in Microsoft Teams Admin by adding the SIP Proxy / SBC address and port and enabling it.
  5. Dial plan configuration - to enable calls to be translated from local dialing formats to a standard E.164 format some dial patterns need to be configured in Microsoft Teams Admin. Likewise if you want to route extensions on your PBX through direct dial a dial plan directive is needed for these number types also.


Microsoft Guide to on Phone System Direct Routing - https://docs.microsoft.com/en-us/microsoftteams/direct-routing-landing-page

Microsoft Guide to Planning Direct Routing - https://docs.microsoft.com/en-us/microsoftteams/direct-routing-plan

Microsoft guide to setup Direct Routing - https://docs.microsoft.com/en-us/microsoftteams/direct-routing-configure

Step 1 - Connect SBC (SIP Proxy) with Microsoft Phone System - https://docs.microsoft.com/en-us/microsoftteams/direct-routing-connect-the-sbc

Step 2 - Enable users for Direct Routing Voice and Voicemail - https://docs.microsoft.com/en-us/microsoftteams/direct-routing-enable-users

Step 3 - Configure Voice Routing - https://docs.microsoft.com/en-us/microsoftteams/direct-routing-voice-routing

Step 4 - Translate numbers to an alternate format - https://docs.microsoft.com/en-us/microsoftteams/direct-routing-translate-numbers

Order a SIP Proxy - https://www.irishvoip.com/sipproxy.php

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