CallTower

Name

CallTower

Legal name

CallTower Inc.

Website

https://calltower.com

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

251–500 employees

Ownership category

akta.pro rank

Product category

Cloud Communications (UCaaS/CCaaS)

NAICS

Wired Telecommunications Carriers (517111)

SIC

Services-Telephone Interconnect Systems (7385), Telephone Communications (No Radiotelephone) (4813)

akta.pro industry

PRIMARYHDAIAHAA

UCaaS Platforms & Suites

Hardware, Technology & Telecom/Telecommunications & Network Services/Unified Communications & Voice Services (VoIP, UCaaS)

SECONDARYHDAIAHAF

Contact Center (CCaaS) & Customer Engagement Voice

Hardware, Technology & Telecom/Telecommunications & Network Services/Unified Communications & Voice Services (VoIP, UCaaS)

SECONDARYHDAIAHAB

Cloud PBX & Hosted Telephony

Hardware, Technology & Telecom/Telecommunications & Network Services/Unified Communications & Voice Services (VoIP, UCaaS)

SECONDARYBPAEAIAE

Unified Communications & Contact Center for Workplace (UCaaS/VoIP, Meeting Rooms)

Business & Public Services/IT & Digital Services (Managed Services, Systems Integration)/Digital Workplace & End-User Computing Services

Keywords

• Cloud communications
• Unified communications
• Contact center as a service
• Enterprise voice services
• SIP trunking solutions

Headquarters

HQ city

South Jordan

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Infrastructure, Personnel, Operations, Marketing or Sales

Revenue model

1. UCaaS Subscriptions: Recurring subscription revenue from unified communications as a service solutions including Microsoft Teams Operator Connect, Webex Calling, and Zoom Phone services with global voice infrastructure
2. CCaaS Subscriptions: Contact Center as a Service solutions including Genesys Cloud, Five9, Zoom Contact Center, and Webex Contact Center with AI-powered customer experience capabilities
3. Professional Services: CX consulting, contact center migration services, workflow optimization, integrations, analytics, AI enablement, and training services
4. Managed Services: Ongoing monitoring, optimization, and operational support for communications and contact center environments

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels6 records

Core offering

CallTower delivers cloud-based Unified Communications as a Service (UCaaS), Contact Center as a Service (CCaaS), and AI-powered Customer Experience (CX) solutions integrating Microsoft Teams, Webex by Cisco, Zoom, Genesys, and Five9 platforms with proprietary SIP trunking, compliance recording, analytics, eSIM mobile, and conversational AI capabilities. Services are sold on recurring subscriptions, supported by 24/7/365 managed services and CX professional services, and delivered globally across 80+ countries through 15 geo-redundant data centers.

Product overview

CallTower is a cloud-based unified communications and contact center solutions provider offering a multi-platform portfolio that integrates Microsoft Teams, Webex by Cisco, and Zoom as its core UCaaS platforms. The company delivers solutions across three main categories: UCaaS (unified communications as a service), CCaaS (contact center as a service), and AI-powered CX (customer experience). Core UCaaS offerings include Microsoft Teams Solutions with Operator Connect and Direct Routing, Webex Calling, and Zoom Phone. Contact center solutions span Genesys Cloud, Five9, Webex Contact Center, Zoom Contact Center, and CT Contact Center. Key add-on modules include CT SIP (SIP trunking), CT Recording (compliance recording), CT Analytics, CT Text, CT Fax, CallTower AI (conversational AI platform), Voice Spam Blocking (Mutare-powered security), Dynamic E911, One Click Failover, eSIM mobile solutions (Teams Mobile eSIM and Webex Go), Phonism (device management), and CallTower Connect (proprietary admin portal). The company also provides CX Solutions combining Emite analytics, Parloa conversational AI, and Aspect workforce management. Services are delivered globally across 80+ countries through 15 geo-redundant data centers.

Differentiator

Problem solved

Functional benefit

Brands

• CT SIP: Scalable, secure SIP trunking with HD voice and video, bursting for peak demand, plus auto-failover, call routing, robo-call blocking and SMS
• CT Fax
• Phonism
• CallTower AI
• CX Solutions

Products and services

• Microsoft Teams Solutions Unified communications platform offering Operator Connect, Direct Routing, and GCC High Teams Direct Routing for enterprise voice and collaboration across global organizations.
• Webex Calling Cisco-powered UCaaS solution for enterprise calling with Webex Dedicated Instance option for dedicated cloud infrastructure.
• Zoom Phone Cloud-based phone system from Zoom providing enterprise voice capabilities with integrated collaboration features, sold by CallTower as a managed service.
• Genesys Cloud AI-powered contact center platform with FedRAMP Moderate authorization for government secure communications, omnichannel engagement, and workforce optimization.
• Five9 Contact Center Cloud contact center solution offering intelligent routing, analytics, and workforce optimization for customer experience.
• Webex Contact Center Cisco's enterprise contact center platform integrated through CallTower for omnichannel customer engagement.
• Zoom Contact Center Zoom's contact center solution for seamless customer experiences integrated within CallTower's CCaaS portfolio.
• CT Contact Center CallTower's proprietary contact center solution providing integrated customer experience management.
• CT SIP Trunking Scalable, secure SIP trunking with HD voice and video, bursting for peak demand, auto-failover, call routing, robo-call blocking and SMS managed via the CallTower Connect portal.
• CT Cloud Fax Cloud fax solution enabling businesses to send and receive faxes from email clients including Outlook, Gmail, and Microsoft 365 with SMTP over TLS encryption.
• CallTower Connect Proprietary customer administration portal providing centralized visibility and control across users, provisioning, analytics, and communication management workflows for enterprise communications environments.
• CX Solutions Comprehensive customer experience platform integrating analytics, AI, workforce management, and automation from multiple providers including Emite analytics, Parloa conversational AI, and Aspect workforce management.
• CallTower AI AI-powered customer experience platform including conversational AI, virtual agents, and AI-powered automation for contact centers.
• Voice Spam Blocking Network-level spam and vishing protection powered by Mutare using STIR/SHAKEN caller authentication and real-time threat intelligence for enterprise voice security.
• Phonism Multi-vendor device management platform for migrating from on-premises legacy phones to cloud phone systems, supporting Yealink, Poly, Grandstream, Cisco, Fanvil, Mitel, Avaya, Snom, and Vtech devices.
• Global Enterprise Voice Solutions Geo-redundant global voice services delivering enterprise communications across 80+ countries with 15 data centers, provided as a managed service offering.
• CT Recording Compliance recording solution integrated with Microsoft Teams and Webex platforms providing AI-driven conversation intelligence and audit-grade recording for regulated industries.
• Teams Mobile eSIM eSIM-based mobile solution enabling business numbers on employees' personal devices integrated with Microsoft Teams Mobile, with dual SIM compliance separation.
• Webex Go eSIM eSIM solution for Webex Calling enabling enterprise mobility with business calls routed through Webex infrastructure while preserving employee privacy.
• MSP Program with GTx Partner program for Managed Service Providers offering the GTx self-service platform for service-provider taxation simplification and operational efficiency, enabling channel-led delivery of CallTower services.

Quantifiable outcome

• Six consecutive years as top-ranked North American UCaaS provider on Frost Radar
• +1 more outcomes

Named customers2 records

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration28 records

AI capability10 records

Feature8 records

Partnerships

Eleven partnerships are on record, tiered flagship and core.

• MicrosoftflagshipTechnology or IntegrationCertified partner for Microsoft Teams Operator Connect, Direct Routing, GCC High Teams, and Dynamics 365 integration. Provides UCaaS solutions with enterprise calling capabilities on Microsoft platforms.
• Webex by CiscoflagshipTechnology or IntegrationCertified Webex Calling and Webex Contact Center partner with Cisco Certified Mobile Calling Provider certification for Webex Go eSIM solutions.
• ZoomflagshipTechnology or IntegrationAuthorized Zoom Phone and Zoom Contact Center partner providing cloud phone and contact center solutions.
• GenesysflagshipTechnology or IntegrationGenesys Cloud and Genesys Cloud for Government partner with FedRAMP authorized solutions for federal agencies. Named Genesys Midsize Partner of the Year multiple times.
• Five9coreTechnology or IntegrationFive9 Contact Center partner providing cloud contact center solutions with professional services and implementation support.
• MutarecoreTechnology or IntegrationVoice Traffic Filter technology partner powering CallTower's Voice Spam Blocking solution with STIR/SHAKEN caller authentication and real-time threat intelligence.
• TollringcoreTechnology or IntegrationExpanded partnership to deliver AI-driven compliance call recording and conversation intelligence to Microsoft Teams customers across 80+ countries with Microsoft-certified solutions.
• ParloacoreTechnology or IntegrationAgentic AI partner providing conversational AI for customer interactions with autonomous multilingual agents, real-time translation, and AI agent lifecycle management.
• AspectcoreTechnology or IntegrationAspect Gold Partner for over two decades providing workforce management solutions including forecasting, scheduling, and real-time adherence monitoring.
• InoriacoreOthersAcquired company specializing in contact center and unified communications solutions. Operates from Montreal, Quebec with dedicated professional services capabilities.
• OneStream NetworkscoreOthersRochester-based UCaaS solutions provider acquired in 2022 to expand global reach and strengthen product offerings including SIP voice services.

Scale indicators7 records

Recent moves8 records

Expansion highlights7 records

Direct peers

• 8x8: Public UCaaS + CCaaS provider (8x8 Voice for Microsoft Teams, 8x8 Contact Center) targeting mid-market and enterprise. Highly comparable business model and customer profile, with the same Operator Connect/Direct Routing positioning against Microsoft as CallTower.
• RingCentral: Public UCaaS/CCaaS leader with RingEX and RingCX suites. Directly comparable to CallTower as a multi-tenant cloud communications provider serving mid-market and enterprise customers with similar subscription-driven recurring revenue model, though at materially greater scale.
• Sangoma Technologies: Public UCaaS/VoIP and communications platform (Star2Star, Sangoma Cloud) competing across SMB and mid-market. Comparable business model combining proprietary infrastructure with multi-tenant cloud UCaaS offerings, and competing for similar partner-channel-led growth.
• Mitel: PE-backed (Searchlight Capital) UCaaS and communications provider transitioning from on-premises PBX to cloud. Comparable customer base of mid-market and enterprise organizations needing voice modernization, with similar reliance on channel partners and recurring subscription revenue.
• Five9: Public CCaaS pure-play and one of CallTower's flagship resold platforms. While Five9 is also a CallTower distribution partner, it competes directly for enterprise CCaaS deals including cloud-migration opportunities that CallTower targets.
• Vonage (Ericsson): UCaaS/CCaaS provider now owned by Ericsson, serving SMB through enterprise with Vonage Business Communications and Vonage Contact Center. Comparable cloud communications portfolio and mid-market focus, with similar global ambitions.
• Genesys: Public/PE-backed CCaaS leader with Genesys Cloud. Like Five9, both a key CallTower partner (Midsize Partner of the Year three years running) and a direct competitor in CCaaS implementation deals across mid-market and enterprise.

Broad incumbents

• Microsoft (Teams Phone): Platform owner of Microsoft Teams Phone (Operator Connect, Direct Routing, Phone Mobile). Microsoft is the dominant CallTower partnership (Flagship tier across multiple programs) and the most significant competitive threat: native Teams Phone, eSIM Teams Mobile, and Operator Connect reduce the addressable market for third-party voice operators over time.
• Zoom Video Communications: Platform owner of Zoom Phone and Zoom Contact Center. Directly competes for unified-communications and contact-center buyers, particularly when customers want single-vendor economics. CallTower is a Zoom Phone authorized partner, but Zoom's continued direct push into enterprise voice compresses CallTower's reseller margin.
• Cisco (Webex): Platform owner of Webex Calling and Webex Contact Center. While CallTower is a Cisco-certified Mobile Calling Provider and Flagship Webex Calling partner, Cisco's continued investment in Webex as an enterprise suite (including Webex Go eSIM that CallTower resells) creates overlapping capability that can compete with CallTower's higher-margin services.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat7 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/calltower
• YouTubeyoutube.com/user/CallTowerUC
• Facebookfacebook.com/CallTower
• LinkedInlinkedin.com/company/calltower
• Instagraminstagram.com/calltowerinc

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries2 records

Funding overview

Funding rounds3 records

Investors2 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A3 records

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about CallTower