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International Microsoft Teams Phone System.

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


Communicate through chat, meetings, video and voice calls to anyone inside and outside your organization. Host audio and web conferences.

Make calls to landlines, mobiles or international destinations from a single, dedicated geographic number from 6000 cities globally. Collaborate with ease, managing your business communications from a single, integrated platform regardless of your disparate locations.

CallTower’s multinational Microsoft Direct Routing solution delivers services to over

70+ countries  |  6,000 cities

using high quality Calling Line ID (CLI) routes – providing simple, global landline and mobile calling for Microsoft Office 365 Teams.


Network and Platforms
completely optimized for voice

Highly Scalable with to grow or contract to meet your business needs

Multi redundant, robust blobal links – enterprise grade routes

POPs in 24 Locations, for low lateency pathways

Geographic DIDs
available in 100+ countries

Quality assured CLI routes highest quality International routes

Direct Connection via Azure
= Low latency + control

Low Cost Rates for affordable Domestic and International

Number portablility, so you can keep your numbers

24x7x365 support so there’s help whenever you need it

Rapid Global Deployment
with our platform agility