Since its inception in 2002, CallTower has evolved into a global cloud-based, enterprise-class Unified Communications, Contact Center and Collaboration solutions provider for growing organizations worldwide.

CallTower provides, integrates and supports industry-leading solutions, including Microsoft® Teams Direct Routing, Operator Connect, Office 365, GCC High Teams Audio Conferencing and PSTN, Cisco® Webex Calling / UCM, Cisco® CCPP, CT Cloud UCaaS, CT Cloud Meeting powered by Zoom and four contact center options, including Five9 for business customers.

Top VOIP provider 2022

Based on several G2 reviews, CallTower is a top ranked VoIP provider with 93% of users rating 4 or 5 stars, 92% customer recommendation rating, 98% ease of doing business with, and the highest quality of support amongst all providers.

CallTower empowers business customers with Unified Communications, Contact Center and Collaboration solutions, changing the way people communicate around the world.

Key UCAAS integrations. Enterprise quality – feature-rich solutions

CallTower ensures that businesses reach their full communication potential and stay competitive, with the most advanced capabilities in today’s quickly evolving marketplace. With easy to use business communication technology, we enhance strategic and business operational effectiveness by integrating scalable cloud-based paramount Unified Communications communication solutions while reducing overall cost in telecom spend.

Calltower’s robust & redundant global network

We provide the service, manage the network upgrades and integrate the technology and applications into your business with around the clock monitoring by our Network Operations Centers. With a robust global network offering redundant connections through leading providers, CallTower can connect to almost any place at any time. We also provide Multi-Protocol Label Switching (MPLS), dedicated lines and global Session Initiated Protocol (SIP) Trunks all with 24x7x365 monitored services to ensure maximum uptime and available dynamic application failover.

Dynamic voice redundancy solutions

Outages and downtime cost you time and money. You deserve multiple paths to ensure 100% voice uptime. CallTower’s expanding offering includes a wide range of circuit providers to offer carrier diverse flexibility and peace of mind, including, One-Click Failover.


CallTower Product Brochures

The CallTower Advantage
CallTower Differentiators
Cloud Voice Hub
3 Simple Steps. CallTower’s Global PSTN
Crash Course // Microsoft Teams
International Microsoft Teams Phone System
Microsoft Voice Solutions // ebook
Cloud Connected PSTN for Cloud UCM
Cisco Webex eBook
Cloud Connected PSTN for Webex Calling
Cisco Webex Contact Center Overview
Turning Cloud Calling into Collaboration


learn more here about how you can access the 186Kloud Supplier eco system and 1-step closer to having CallTower’s services at your customer’s fingertips.

or get in touch by email [email protected] or +44 0203 997 1600