Microsoft Teams Phone

Get the most out of Microsoft Teams with Gamma

Transform the way you communicate on Microsoft Teams with the UK’s #1 SIP provider. We can help your business deploy secure, effective voice and video collaboration for your Microsoft Teams environment.

With over 20 years’ experience in delivering cloud-first communications services and a Microsoft Solutions Partner for Modern Work with Advanced specialisation in Calling for Microsoft Teams, Gamma are experts in enabling voice for Microsoft Teams Phone.

Choose how you enable PSTN calling with Operator Connect, Direct Routing or Horizon for Teams.  Our flexible Direct Routing options can be managed, unmanaged or customised. Whatever your needs, we have a solution to suit your business.

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Decision Tool

Find the right Microsoft Teams Phone solution for your business

Choosing the correct voice solution for Microsoft Teams can be confusing, particularly with the different options available, from Operator ConnectDirect RoutingCloudUCX and Microsoft Calling Plans.
We’ve created this tool to help you find the right solution for your business. The tool will only take a few minutes to complete and will ask a few questions to help with your decision making process

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Microsoft Teams Whitepaper

Microsoft Teams Phone – Pivotal for the modern workplace

Why unify collaboration and not communication? Why leverage the Microsoft 365 landscape with the exclusion of voice. Things have changed. Where employees once had to navigate between a number of different applications or systems, they now have access to more unified solutions.

Download our whitepaper and learn more on taking the last step to a truly modern workplace.

Click here to download


Microsoft Teams Phone with Gamma

Operator Connect for Microsoft Teams

Operator Connect is a way for businesses to simply and quickly enable calling for Microsoft Teams, leveraging Gamma as their operator.

For organisations looking for high levels of availability and resilience, backed by Microsoft’s Operational Excellence programme.



Microsoft Teams Phone with Gamma’s Direct Routing

Direct Routing for Microsoft Teams

Microsoft Teams Direct Routing is ideal for organisations simply looking to enable voice within Microsoft Teams, with the capability to manage deployment in-house.

This solution offers free calls, enhanced call control features and carrier-grade infrastructure, maximising value from your Microsoft Teams environment.


Microsoft Teams Managed Services

Microsoft Teams Cloud UCX™

CloudUCX™ is a collection of leading cloud solutions – delivered as a service – which enhances the standard Microsoft Teams offering.

For organisations that require additional flexibility, have more complex estates or international requirements.


A business-grade cloud PBX for Microsoft users

Horizon for Microsoft Teams

Businesses looking to enable voice within their Microsoft Teams can now use Horizon for Microsoft Teams to make and receive calls globally while benefiting from a feature-rich, cost-effective alternative to Microsoft Calling Plans.


Enable Microsoft Teams Phone with Gamma

What makes Gamma the right choice for Microsoft Teams?

How does Gamma compare with other providers?

Other Teams Voice ProvidersGamma
CommoditySIP and SBC Support
Portal based support
Phone support
24×7 support
DR Adds, Moves and Changes
Regular Service Reviews
Dedicated Account Manager
Enablement & SupportManaged onboarding
User Migration
Training and Adoption services
Cloud based Training Portal
Dedicated Customer Success Manager
Microsoft Teams support
Teams – Adds, Moves and Changes
Guided Success Delivery Framework
Number Porting Assurance Service
Packaged services / Transition services
Integrated into Teams Admin Center
Microsoft PartnershipPartnered with Microsoft to provide shared SLAs for support, availability and call quality
Calling for Microsoft Teams Advanced Specialisation


Brands that rely on Gamma solutions.

Our awards and accreditations

Highly accredited, secure and reliable

Recent blog posts.