In short
Call2Teams, a Dstny product, is a cloud Direct Routing service for Microsoft Teams. Call2Teams for PBX registers Teams users to your existing phone system as SIP extensions, keeping its hunt groups and call flows; Call2Teams for SIP Trunks brings your carrier and numbers into Teams. Forever Systems can quote and set up Call2Teams with the Teams Phone licences it needs.
Get a quote for Call2Teams
Tell us roughly how many users or sites you have and we will come back to you with options and a quote.
What Call2Teams is
Call2Teams is a cloud platform from Dstny that connects Microsoft Teams to telephony an organisation already has. It sits between Teams and a PBX (private branch exchange) or SIP trunk and presents the calls to Teams over Microsoft's Direct Routing interface, so there is no Session Border Controller for the organisation to run.
Users make and take calls in the standard Teams app. Dstny says (opens in a new tab) that covers the Teams client on desktop, on mobile and in the browser, with no separate app or dial pad.
In the product
The two Call2Teams services
| Service | What it connects | What stays the same |
|---|---|---|
| Call2Teams Direct Routing for PBX | Teams users to your existing phone system, each registered as a SIP extension | The phone system's routing logic, hunt groups, IVR and call flows |
| Call2Teams Direct Routing for SIP Trunks | Your existing SIP trunk and its numbers to Teams Phone | Your carrier and numbers, with no number porting |
Dstny also lists Call2Teams Operator Connect, which it describes as built for operators and carriers, and Call2Teams Mobile, which brings mobile numbers into Teams.
Not sure which option fits? Ask us
Tell us what you need and we will recommend the right option for your organisation, with a quote.
How Call2Teams for PBX works
With Call2Teams for PBX, the platform registers to your phone system as a standard SIP device, one registration for each user extension, and maps each extension to a Teams user. Dstny describes it as working with any SIP-capable PBX or call control platform, whether on-premise, cloud-hosted or hybrid.
- The user's extension rings in Teams, with transfer, hold, forwarding and voicemail
- Call flows, hunt groups and menus stay on the phone system
- The registration reaches the phone system over the public internet, with no dedicated network connection and no on-site installation
How Call2Teams for SIP Trunks works
Call2Teams for SIP Trunks connects an existing SIP trunk to Teams, so Teams Phone becomes the phone system while the carrier keeps supplying numbers and calls. Dstny says the existing numbers are assigned directly to Teams users, with no number porting, no change of call plan and no carrier contract to renegotiate.
The trunk connects to the platform by SIP registration or by fixed IP addresses, set up in the Call2Teams portal with no site visit. Numbers can then be assigned to individual Teams users, call queues or auto attendants.
Is Call2Teams the right fit for you?
We will check it against your systems and requirements and recommend the right option.
What Call2Teams needs
- A plan that includes Teams, for each user
- A Teams Phone licence for each user. Call2Teams uses Direct Routing, and Microsoft requires Microsoft Teams and Teams Phone for Direct Routing users. No Microsoft Calling Plan is needed
- For the PBX service: a SIP-capable phone system and a SIP extension for each Teams user
- For the SIP trunk service: a SIP trunk from your carrier, with the numbers you want in Teams
Microsoft Teams Phone Standard covers the Microsoft licence.
When Call2Teams fits, and how we help
Call2Teams tends to suit organisations that want Teams calling without replacing a phone system or carrier that works, for example where a contact centre or recording system depends on the existing PBX. If there is no phone system to keep, our Teams calling service connects Teams to the phone network directly.
We supply Call2Teams together with the Teams Phone licences it needs, and we can:
- Check your phone system or SIP trunk and plan how extensions map to Teams users.
- Set up the Call2Teams service, the Teams Phone licences and voice routing.
- Pilot with a small group, then roll out by team.
Pricing depends on users and service, so ask us for a quote. Contact us to talk it through.
Sources (checked 11 November 2026): Dstny's Call2Teams pages on dstny.com (Call2Teams home, Direct Routing for PBX and Direct Routing for SIP Trunks); Microsoft Learn, "Plan Direct Routing".
How Forever Systems helps with Teams Phone
Forever Systems can quote and set up Microsoft Teams Phone for your organisation and connect it to the phone network.
- Licence and calling check: we look at the Microsoft 365 plan you hold and recommend the Teams Phone licences and calling option that fit
- Numbers kept: we plan and manage the porting of your existing numbers
- Call flows set up: auto attendants, call queues and opening hours built and tested with you
- Works with what you use: the Teams apps on desktop and mobile
- Licensing in one place: licences can be billed monthly, with terms confirmed at quote
We work with businesses, schools, charities and public sector organisations. Pricing depends on users, licences and calling, so ask us for a quote.
Frequently asked questions
What is Call2Teams?
Call2Teams is a cloud Direct Routing service from Dstny that connects Microsoft Teams to an existing phone system or SIP trunk. Users make and take calls in the Teams app while the phone system or carrier keeps carrying the telephony.
Do I need a Teams Phone licence for Call2Teams?
Yes. Call2Teams connects through Microsoft's Direct Routing, and Microsoft requires each Direct Routing user to hold Microsoft Teams and a Teams Phone licence. A Microsoft Calling Plan is not needed.
Does Call2Teams need equipment on site?
No. Call2Teams runs in the cloud and reaches the phone system or SIP trunk over the internet. Dstny says no on-site installation or dedicated network connection is needed.
Which phone systems work with Call2Teams for PBX?
Dstny describes it as working with any SIP-capable PBX or call control platform, whether on-premise, cloud-hosted or hybrid. We check your system when we quote.
Can I connect my existing phone system to Microsoft Teams?
Yes. Call2Teams for PBX registers each Teams user to the existing phone system as a SIP extension, so the phone system keeps its call routing while users call in Teams.
Still have a question about Call2Teams?
Ask us and a member of our team will get back to you.