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Who is CallTower?
CallTower is a unified communications and collaboration service provider that delivers cloud-based voice, conferencing, contact center, and related services for enterprises.
- Cloud-based unified communications as a service (UCaaS) for enterprise voice and collaboration
- Hosted and managed solutions for Microsoft and Cisco unified communications ecosystems
- Contact center and call routing services integrated with enterprise collaboration platforms
- Network, security, and managed services to support voice and collaboration workloads
- Compliance-focused communications offerings for regulated and distributed organizations
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More About CallTower
CallTower provides unified communications as a service (UCaaS) and collaboration solutions that are designed for enterprise IT environments, with an emphasis on cloud-delivered voice, video, messaging, and contact center workloads. Its portfolio centers on hosted and managed deployments of well-known collaboration platforms, offering enterprises a way to consume these capabilities as fully managed services rather than operating on-premises (on-prem) telephony and PBX systems.
The company focuses on integrating cloud voice and collaboration with Microsoft-based environments (unified communications and collaboration) and Cisco-based environments (unified communications and collaboration), enabling organizations to standardize calling, conferencing, and collaboration on platforms already in use for productivity or networking. CallTower typically provides carrier-grade voice services, DID management, Session Initiation Protocol (SIP) trunking (voice networking), and conferencing services, combined with administration, monitoring, and support.
In enterprise and institutional settings, CallTower’s offerings are positioned as an alternative to maintaining legacy PBX infrastructure or stand‑alone conferencing systems. By hosting and managing the calling and collaboration stack, CallTower allows IT teams to focus on identity, endpoint management, and application strategy while relying on a provider for PSTN connectivity, routing, capacity management, and service availability. The services are commonly used in multi-site and remote‑work scenarios where consistent dial plans, call routing policies, and conferencing capabilities are required across geographies.
Architecturally, CallTower operates cloud-based platforms that interconnect with enterprise networks over the public internet, private connectivity, or Virtual Private Network (VPN), depending on customer design. Its services typically interoperate with standard Voice Over Internet Protocol (VoIP) protocols such as SIP (voice networking) and support integration with session border controllers (network security) where enterprises require demarcation between internal networks and external carrier services. The company also provides features relevant to compliance and governance, such as call recording, retention, and reporting, which are often required in financial services, healthcare, and other regulated sectors.
From a marketplace taxonomy perspective, CallTower fits within Unified Communications as a Service (UCAAS), enterprise voice, collaboration, and contact center service categories. It also occupies adjacent categories such as managed network services for voice, PSTN connectivity, and compliance-focused communications. For directory and cataloging purposes, CallTower can be classified under unified communications and collaboration platforms, cloud telephony providers, and managed service providers for Microsoft and Cisco collaboration ecosystems.
Our description of CallTower. Updated December 2025.
