CallTower

CallTower occupies a unique position in the UCaaS landscape: a single provider that delivers four major enterprise communications platforms — Metaswitch, Microsoft Teams voice, Cisco Webex Calling, and Zoom Phone — under one vendor relationship. Headquartered in South Jordan, Utah, with approximately 400 employees, CallTower has built a business model around the reality that enterprise organizations rarely want to be locked into a single technology vendor's roadmap.

Multi-Platform Operator Model

CallTower functions as a certified operator for multiple platforms, allowing organizations to choose the communications infrastructure that fits their existing workflows while managing the complexity through a single support relationship. Organizations that want native Teams calling can have it. Those who have standardized on Webex or Zoom can maintain that investment. And organizations requiring a traditional hosted PBX have the Metaswitch option. The critical advantage: one contract, one invoice, one support team — regardless of platform.

Reliability and Scale

The 99.999% uptime SLA places CallTower among the elite tier of UCaaS providers for reliability commitments. The 50-seat minimum and $500 monthly recurring charge entry point positions CallTower as a mid-market to enterprise play, appropriate for organizations with enough complexity to benefit from multi-platform flexibility and dedicated support. The largest referenced deployment stands at 27,000 seats.

Global Infrastructure

CallTower's data center infrastructure is genuinely global — APAC coverage in Hong Kong, Melbourne, Singapore, and Sydney; EMEA presence in Frankfurt and London; and U.S. sites in Atlanta, Chicago, Dallas, Los Angeles, Salt Lake City, and Virginia. International PSTN replacement covers 45+ countries, and PSTN calling plans include US/Canada unlimited usage with metered options.

Strategic Acquisitions

Acquisitions of Appia, Inoria, OneStream, and SoundConnect have each contributed distinct capabilities to the platform's depth. For KeaneAdvisors' clients navigating Microsoft-centric enterprises or Cisco-heavy network environments, CallTower's ability to operate as the certified cloud voice operator for Teams or Webex while maintaining parallel platform options is a compelling risk management and future-proofing argument.