Microsoft Teams.

CallTower delivers an International Integrated Office 365 Native Microsoft Teams experience


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Microsoft Teams
Direct Routing

Microsoft Teams
GCC High

Microsoft Teams
Operator Connect

SMS Texting
SMS Text

Contact Center
Contact Center


International Calling

Microsoft Teams      Microsoft Gold Partner



CallTower was the first solution provider to deliver an integrated Office 365 Native Microsoft Teams experience with global calling plans, empowered by a 24/7/365 client services team and ensuring a personalized implementation, adoption, training and support strategy. As a Microsoft Gold Partner, CallTower’s monitoring and management services provide the highest quality user experience.

The Microsoft Teams Phone System powered by CallTower enables customers to bring their current voice services into the Microsoft Cloud through Direct Routing. Direct Routing ensures the ability to leverage CallTower’s preferred rates and unlocks the full potential of a Microsoft Teams Phone System. CallTower delivers key Microsoft Teams UCaaS features and functionality which are unavailable through other providers. Customers using CallTower’s Teams Direct Routing offering can also easily redirect calls to an alternate number in case of a Microsoft outage and stay connected.

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Download In-depth Cost Comparison Guide

Customers can leverage CallTower’s preferred and flexible rates and unlock the full potential of a Microsoft Teams Phone System.

CallTower made the transition to Teams Direct Routing Phone System seamless for our users. By performing all the necessary setup in Office 365 prior to, and at the time of, the migration, and conducting training sessions for our users, they provided a literal turnkey solution for our new phone system.

Richard Wilhite

System Administrator Supervisor, Allen Press

Contact Center


CallTower delivers a seamless suite of fully integrated UCaaS and CCaaS solutions that are easy to deploy, easy to use, and can support our customers’ transition to the cloud.

International Calling


International Microsoft Teams Phone System using Direct Routing provides a simple, global landline and mobile calling for Microsoft Office 365

GCC High


CallTower is the only voice provider delivering Direct Routing in GCC High to support Microsoft 365 GCC High for government contractors that work with the Department of Defense

SMS Texting


Send and receive SMS from Microsoft Teams with CT TEXT. Connect instantly with your contacts in Outlook, Active Directory, SharePoint, and with your MS Teams channel members.


Multiple direct private connections to Microsoft

CallTower’s network and platforms completely optimized for voice

Re-Route phone calls to other devices when Microsoft has an outage

Managed Direct Routing service through geo-redundant hosted SBC’s

Live training and 24/7/365 support

No networking or edge equipment needed

Global carrier connections with 15+ voice carriers and 30+ Internet peering partner

Emergency services in 30+ Countries

SMS and CRM integration

Porting between customer’s PBX to Teams by CallTower

Analog device support – faxes, paging, door buzzers, security gates, credit card machines

CallTower Connect

CallTower Connect simplifies the set-up and management of CallTower services like Microsoft Teams – facilitated within one easy to use online or mobile app. The provisioning application is launched by an end-user or company administrator to add or manage CallTower hosted services. The workload of administrators decreases as users gain access to a simplified panel where changes to Microsoft Teams can be made without a call to support.

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CallTower’s Microsoft Teams Direct Routing solution provides a feature rich solution to fit your business needs along with a wide range of Poly, Yealink and other Microsoft integrated devices.

View Supported Devices


Learn more about the awards CallTower has received for its Native Microsoft Teams Direct Routing solution

View Awards


Case Study – 
Allen Press

GCC High Case Study

Teams Price Comparison Guide

5 Mistakes to Avoid when Using Teams

Why is Teams with CallTower the Best Choice?

CT Microsoft Teams Implementation Guide

Case Study – PING Golf