End-to-end voice solutions for Teams

Complete voice solutions for small and large companies on Teams.
Local and international phone numbers, competitive calling rates, a fully-fledged contact center solution and CRM integration with more than 150 systems.

Our all-in-one solution

CallTo365 One

A comprehensive, full-featured package designed to streamline your business communications. From (international) phone numbers and call minutes to a fully-fledged telephone system. Our platform offers all essential features such as IVR, ACD, queuing, reporting, call recording, CRM integration and a robust contact center.

Everything you need, under one roof.

End-to-end solution

End-to-end voice solutions for companies that work with Microsoft Teams

Affordable rates

Affordable call rates and you no longer need expensive, extra addons for a complete voice solution.

Flexible and scalable

Pay per user, per month. Easily scale up, scale down and without long term commitments

Proven technology

Thousands of companies use Teams telephony via our platform every day

Native cloud solution

No hardware or on-premise infrastructure required thanks to our native cloud solution

Easy implementation

Thanks to smart automation, you can start calling with Microsoft Teams within minutes

Why call with
Microsoft Teams?

Make your business telephony state-of-the-art and available everywhere

Traditionally reliable telephony +

State-of-the-art functionalities

International & local phone numbers

CRM integration · API · Webhooks

Online self-service portal

Everything that comes with traditional telephony (PBX)


CallTo365 One

Our flagship: the complete telephone system in Microsoft Teams with CRM integration.

CallTo365 Products

Decide for yourself which parts you want to add to your telephone exchange with our building blocks

SIP trunking Phone numbers Telephone system
Microsoft Teams CRM integration Contact Center

What makes CallTo365
this unique?

Love for technology

We are incredibly driven and always looking for the latest technological developments in the field of telephony, without jeopardizing stability.

Experts in Teams Telephony

CallTo365 is a young company but has specialized in-house UC expertise and decades of experience in enterprise-level IT and telecom.

Enterprise network + infrastructure

Our infrastructure is based on state-of-the-art technology and a redundant carrier-grade network that is connected to dozens of carriers and partners worldwide.

Flexible and affordable

Due to our size, we have the optimal capacity to provide you with low cost, high quality and targeted service without getting caught up in bureaucracy and processes.

Find out why
customers trust us

Thousands of users Are trusting on our services daily

Active phone numbers
1 K
Satisfied customers
1 +
Minutes per month
1 M+
Countries connected

Do you have an existing telephone system that needs to be migrated?

Our Proof of Concept (PoC) service is specifically designed to help companies validate our solution within their own Teams environment. The Proof of Concept is an efficient way to demonstrate the functionality of our solution, with minimal risk, disruption and cost.