The #1 choice for voice providers

Connect your existing phone lines directly to Microsoft Teams and use Teams as your PBX.

Call2Teams for Trunks is a global cloud platform that connects SIP Trunks (digital phone lines) directly into Microsoft Teams in minutes enabling you to keep your existing voice provider with lines, numbers and call bundles and use Microsoft Teams as your PBX.

Previously connecting Microsoft Teams with existing phone lines and voice services used something called Direct Routing which is complicated and expensive.


Now with Call2Teams for Trunks, you can be up and running with your existing carrier in a few minutes, no hardware or software is needed.


Customers now have an easy route to stay with their current provider as they move from a traditional phone service or PBX, to using Microsoft Teams’ built-in Phone System capability as their PBX.

9 reasons to use Call2Teams for Trunks

  1. Your team can use Microsoft Teams as your phone system and make and receive calls on any device.

  2. You keep your current numbers and minutes plan, no porting required.

  3. Call bundles and pools are shared between all Teams users avoiding costly per-user plans.

  4. Available globally for ANY phone service provider to deliver services to Microsoft Teams customers.

  5. No trunk or concurrent channel restrictions so you'll never get a busy tone.

  6. It takes 10 minutes to set up, there's no setup charges, and just a simple per-user monthly charge.

  7. No hardware, software or servers to deploy for you or your phone service provider.

  8. Call2Teams for Trunks uses Microsoft Teams certified infrastructure without needing capital expenditure and installation.

  9. Enterprise-grade security from high-availability Azure data centres.

Bring Your Own Carrier (BYOC) to Microsoft Teams.​

With Call2Teams’s BYOC feature, enterprise customers have the flexibility to keep their current PSTN service providers by redirecting existing voice circuits to the Microsoft Teams Phone System or implementing a hybrid solution with their existing PBX. This unique capability allows customers to enjoy all the benefits and features of Microsoft Teams Phone System while keeping their existing service provider contracts, phone numbers, and calling rates with their preferred carrier of record.

Call2Teams for Trunks

is available globally

Call2Teams for Trunks is available globally and not restricted by the availability to use Microsoft's calling plans, as it uses the customer’s existing lines and phone company, whatever and wherever they are.

Call2Teams for Trunks is also available to purchase from our network of global partners.

Setup and configured without specialist skills

Call2Teams for Trunks is very quick and easy to setup and configure. Simply connect your Office 365 account then add each user using a drop-down menu. Watch the demo video to see how easy it is.

Call2Teams enabled us to deliver a great calling experience to our Office 365 Teams users without compromising on our current call management tools.

And it was set-up in record time.


Tarryn Magistrelli. Finance & Operations Manager, Futerra Sustainability Communications

Try Call2Teams for Trunks free for one month

Sign up for a trial, and get full access to Call2Teams for Trunks. You can add up to 25 users for 1 month.

By clicking ‘Start Your Free Trial’, I agree to Call2Team's Terms & Privacy Policy.


SIP Provider? Partner with us

Call2Teams for Trunks is the perfect solution for many SIP Providers, Microsoft Partners and Telecoms Resellers who can help their customers connect their existing SIP Trunks, lines, numbers and call bundles to Microsoft Teams.

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