Enterprise Unified Communications. Fully Managed. Global.
Since 2002, CallTower has delivered enterprise‑grade UCaaS—uniting voice, collaboration, messaging, and mobility under one provider, one invoice, and one support team.
Industry Recognition
UCaaS Leader, Trusted Globally
- #1 on the 2025 Frost & Sullivan North American UCaaS Radar (6 years)
- G2 Market Leader
- Cloud UC Company of the Year (International Elite 100)
- Channel Futures MSP 501
At a Glance
- Voice coverage in 80+ countries
- Emergency services in 30+ countries
- 15 geo‑redundant data centers
- 24/7/365 live support
- 4 UCaaS platforms
- 1 invoice. 1 support team.
- Founded 2002
UCaaS Platforms
Choose the platform. Keep one provider.
Microsoft Teams
- Operator Connect, Direct Routing, Calling Plans
- GCC High available
- Copilot & Teams Premium integrations
Cisco Webex
- Webex Calling, Webex Go, Dedicated Instance
- Secure global voice & analytics
Zoom
- Zoom Phone & BYOB
- Enterprise voice, devices, and integrations
CT Cloud Voice
- Proprietary CallTower platform
- Global VoIP for office, remote, and hybrid teams
What’s Included
Everything you need—fully managed
Global Voice
- Local numbers worldwide
- Dynamic E911
- Carrier‑grade infrastructure
Communications & Integrations
- Voice, meetings, messaging, mobility
- SMS/MMS & WhatsApp
- Call recording & analytics
- CRM integrations & fax support
Mobility & Devices
- Teams Mobile (eSIM)
- Webex Go
- Zero‑touch device provisioning
Business Continuity
- One‑click Teams failover
- Call rerouting & disaster recovery
- Resilient SIP trunking
Fully Managed Experience
From deployment to day‑to‑day support
Implementation
- Porting & provisioning
- Call flow design
- White‑glove onboarding
- Dedicated project management
Support
- 24/7/365 live support
- Dedicated Client Success Manager
- Training, documentation & webinars
Business Benefits
- Secure, scalable, enterprise‑ready
- OPEX‑friendly, no capital investment
- Faster deployments, simpler management
- Global visibility & centralized control
- Built for multi‑location organizations
- Seamless path to CX, Contact Center & AI
