CallTo365
CallTo365 is a Dutch cloud provider founded in 2020 that delivers end-to-end Microsoft Teams telephony, contact center, and SIP trunking services to SMBs, enterprises, and partners across 70+ countries, monetized via per-user subscriptions, usage-based SIP trunking, and phone number fees.
- Company typePrivate
- Founded2020
- HeadquartersUtrecht, Netherlands
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What CallTo365 does
CallTo365 B.V. is a Dutch cloud communications provider founded in 2020 that delivers end-to-end telephony, contact center, and SIP trunking services natively integrated with Microsoft Teams. Its core technology is a Microsoft-certified, multi-tenant, carrier-grade Session Border Controller (SBC) deployed as a service for Microsoft Teams Direct Routing, enabling traditional PBX functionality (IVR, ACD, call queues, call recording, call groups) inside the Teams client without requiring separate Microsoft Teams Phone Standard licenses. The product portfolio is anchored by the bundled CallTo365 ONE offering and modular building blocks including a Teams Telephone System, Contact Center, SIP Trunking, Phone App for Teams, Teams SBC, and CRM/ERP connectors covering 150+ (reportedly 175+) packages, supported by webhooks/PBX API for custom workflow automation. The platform is interconnected with 170+ carrier partners, operates as a licensed operator in 24+ countries, and delivers local-rate service in 73+ countries.
The company monetizes primarily through a recurring per-user monthly subscription on CallTo365 ONE, supplemented by usage-based SIP trunking revenue, recurring phone number fees (DIDs, 088, 0800/0900, mobile 06), and a €3,000 one-month Proof of Concept professional services engagement with money-back guarantee. Go-to-market is multi-modal: a partner-led channel spanning EMEA, Americas, and APAC; direct enterprise field sales; and product-led self-service via a one-click Office 365 connector. Target customers are SMBs and mid-market organizations migrating from Skype for Business or seeking advanced Teams telephony, as well as enterprises and regulated verticals (education, healthcare, government) needing multi-site and international deployments. Customers cited include HEMA, SKF, Strabag, CGG, Spie, Hager, PCOU Willibrord, Lease.auto, Arcus IT, Guide-IT, Voiped Global Services, and Loogisch.
Operationally, CallTo365 has expanded rapidly: offices in Utrecht, Nistelrode, Sneek, and Woerden (with the latter hosting subsidiary CallTo365 Engage B.V.) in the Netherlands, plus regional offices in London and New York. In December 2024, the company took a minority stake in Voclarion and has subsequently appointed a new CTO, COO, Channel Director, Channel Manager, Cloud Architect, and Strategic Advisor, alongside strategic alliances with Odido Business, De Cronos Groep, and ROGER365.io. No external funding rounds have been disclosed.
CallTo365 firmographics
Firmographics- Name
- CallTo365
- Legal name
- CallTo365 B.V.
- Website
- https://callto365.com
- Company type
- Private
- Founded year
- 2020
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- CallTo365 is a Dutch cloud provider founded in 2020 that delivers end-to-end Microsoft Teams telephony, contact center, and SIP trunking services to SMBs, enterprises, and partners across 70+ countries, monetized via per-user subscriptions, usage-based SIP trunking, and phone number fees.
- Ownership category
- akta.pro rank
CallTo365 industry classification
Industry- Product category
- Cloud Communications
- NAICS
- Telecommunications (517), Wired and Wireless Telecommunications (except Satellite) (5171)
- SIC
- Telephone Communications (No Radiotelephone) (4813), Communications Services, Nec (4899)
- akta.pro primary industry
- Cloud PBX & Hosted Telephony (HDAIAHAB)
- akta.pro secondary industries
- Contact Center (CCaaS) & Customer Engagement Voice (HDAIAHAF), Customer Service/Support CRM & Contact Center Platforms (BPAFAFAK)
Keywords
Where CallTo365 is headquartered
LocationHeadquarters
- HQ city
- Utrecht
- HQ country
- Netherlands
- HQ region
- Europe
Offices6 records
Markets served
CallTo365 business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Operations, Marketing or Sales
Revenue model
- Teams Telephony Subscription: Monthly subscription model per user for Teams telephony services. Includes full telephone system functionality (IVR, ACD, call queues, call groups), CRM integration, reporting, and contact center capabilities as part of comprehensive CallTo365 ONE package.
- SIP Trunking Services: Usage-based revenue from SIP trunking services where customers pay only for what they use. International and national call rates apply per minute or per call basis. Competitive pricing for national and international destinations.
- Proof of Concept Services: One-month PoC service with up to 25 users, priced at €3,000 with money-back guarantee. Professional project management and CRM integration support included.
- Phone Numbers: Revenue from national and international telephone numbers including regional DIDs, special numbers (088 company numbers, 0800 freephone, 0900 premium), and mobile 06 numbers.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Monthly | Proof of Concept (PoC) - 1 month duration, maximum 25 users |
Go-to-market motion3 records
Distribution channels4 records
Marketing channels6 records
CallTo365 product offering
Product offeringCore offering
CallTo365 provides a cloud-based Microsoft Teams telephony platform that adds calling, contact center, and CRM integration capabilities to Microsoft Teams. The service enables businesses to make and receive calls, manage customer interactions, and integrate communications with CRM systems through Direct Routing and Session Border Controller technology, removing the need for on-premises PBX hardware.
Product overview
CallTo365 is a Microsoft Teams telephony platform that offers both an all-in-one bundled solution (CallTo365 ONE) and modular building blocks. The core offering consists of the Teams Telephone System (PBX) which provides traditional telephony functionality within Teams. Additional modules include Teams Contact Center for complex environments, SIP Trunking for voice connectivity, Phone App for Teams (enabling calling without Teams Phone Standard licenses), Teams SBC for Direct Routing connectivity, CRM Integration connecting to 150+ packages, and international phone numbers across 73+ countries. The company also offers Skype for Business migration services. All solutions are delivered as native cloud services with no hardware requirements.
Differentiator
Problem solved
Functional benefit
Brands
- CallTo365 One: All-in-one solution for Teams calling, including phone system, CRM integration, and contact center functionality.
- Teams SBC as a Service
- Phone App for Teams
Products and services
- Microsoft Teams Telephony Cloud-based calling service for Microsoft Teams enabling businesses to make and receive calls natively through the Teams interface using Direct Routing.
- Cloud PBX Hosted private branch exchange service providing enterprise telephony features such as extensions, call routing, and voicemail without on-premises hardware.
- SIP Trunking SIP trunking service that connects Microsoft Teams to the public telephone network for inbound and outbound calling.
- Contact Center Cloud-based contact center solution integrated with Microsoft Teams for handling customer interactions, queues, and agent workflows.
- CRM Integration Integration services that connect Teams telephony and contact center with customer relationship management platforms to surface call context and automate workflows.
Quantifiable outcome
- Lead contact rate increased from 50% to 70-80% for automotive leasing company
- +2 more outcomes
Companies that use CallTo365
Customer profileNamed customers6 records
Segments5 records
Ideal customer profiles3 records
CallTo365 technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
CallTo365 partnerships and signals
Strategic signalPartnerships
Eight partnerships are on record, tiered major, core and flagship.
- De Cronos GroepmajorCollaboration agreement providing all Cronos companies access to CallTo365's Teams platform. Extends CallTo365's reach through Cronos Group's extensive IT services network.
- Odido BusinesscoreStrategic alliance combining Odido's connectivity infrastructure (fixed and mobile SIM solutions) with CallTo365's Teams Phone System. Together they offer complete business telephony within Teams where CallTo365 provides software and Odido provides SIM cards and connectivity.
- VoclarionflagshipStrategic partnership and share acquisition combining CallTo365's Microsoft Teams telephony capabilities with Voclarion's expertise in secure, reliable VoIP and UCaaS solutions for enterprise and government customers. This partnership created the first true Microsoft Teams PBX and enables combined operational and development strength for continued growth.
- ROGER365.iocoreStrategic alliance to offer comprehensive Teams Contact Center solution. ROGER365.io focuses on omnichannel contact center while CallTo365 provides the complete end-to-end Teams calling platform, together enabling customers to fully benefit from Teams as a Platform.
- Arcus ITcoreMicrosoft partner collaborating strategically to help customers achieve ideal modern workplace with Teams environment and telephony solutions. Arcus IT was looking for omnichannel contact center for Teams and partnership began two years ago.
- Guide-ITcoreKPN Business Partner active in center Netherlands delivering Teams and voice solutions for Dutch and international clients. Partnership of over three years addressing unique needs of ICT and telecom sector with solutions between Teams Only and full omnichannel systems.
- Voiped Global ServicescoreTelecom and IT partner joining forces to easily and quickly connect telephony and ICT within large, complicated international projects. Collaboration enables handling of challenging projects with existing structures and multiple international offices.
- LoogischcoreLong-standing partnership since CallTo365's start, specializing in customized Teams solutions for healthcare and manufacturing industries. Collaboration characterized by simplicity in management, implementation, and international phone numbers with one party.
Scale indicators6 records
Recent moves8 records
Expansion highlights6 records
CallTo365 competitors and assessment
Company assessmentBroad incumbents
- Talkdesk: Cloud-native CCaaS platform with strong vertical-specific AI solutions and a Microsoft Teams integration — competes for enterprise customer experience deals where CallTo365's contact center module is positioned.
- Five9: Public cloud CCaaS leader focused on enterprise customer experience — overlaps with CallTo365's contact center ambitions, particularly where Five9's deeper analytics and AI are pitched against CallTo365's Teams-native advantage.
- 8x8: Global UCaaS + CCaaS vendor with Microsoft Teams Direct Routing and XCaaS offerings — competes for the same SMB-to-enterprise customers seeking Teams-integrated voice and contact center capabilities.
- Genesys: Global incumbent cloud CCaaS platform (Genesys Cloud) with broad omnichannel, WEM, and AI capabilities — competes with CallTo365's contact center module for larger enterprise RFPs and increasingly bundles Microsoft Teams integrations of its own.
- Microsoft Teams Phone: Microsoft's native Teams Phone offering with Operator Connect, Direct Routing, and Microsoft Teams Phone Standard — the principal platform incumbent and primary alternative to CallTo365's bundled PBX/contact center solutions.
- Vonage (Ericsson): UCaaS/CCaaS provider (now part of Ericsson) with Vonage for Microsoft Teams — competes across both telephony and contact center categories, with deeper API and global carrier assets than CallTo365.
- RingCentral: Public, large-scale UCaaS and CCaaS provider with global reach and a direct Microsoft partnership for RingCentral for Microsoft Teams — competes across telephony, contact center, and integrations, often at larger enterprise scale than CallTo365.
Direct peers
- Content Guru: UK cloud contact center (storm) and telephony provider serving enterprise and public-sector customers — competes for large multi-site Teams telephony and omnichannel CCaaS deals, particularly in regulated industries where CallTo365/Voclarion also play.
- Luware: Swiss-headquartered vendor of Microsoft Teams-native contact center (Nimbus) and telephony solutions targeting enterprise and IT service desk use cases — competes head-to-head with CallTo365 in Teams-based CCaaS and Direct Routing deployments across DACH and broader EMEA.
- Anywhere365: Dutch Microsoft Teams contact center and dialogue management specialist with deep Direct Routing/PBX heritage — the closest direct peer to CallTo365, competing for the same enterprise Teams telephony and CCaaS deals in EMEA. Senior Strategic Advisor Enrico Karsten previously worked at Anywhere365, underscoring the competitive overlap.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
CallTo365 social profiles
Digital presenceCallTo365 financial estimates
Financial estimateRevenue estimate
Valuation estimate
CallTo365 leadership team
Management profileNumber of profiles
CallTo365 subsidiaries and ownership
Company hierarchySubsidiaries2 records
CallTo365 funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
CallTo365 M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about CallTo365
What does CallTo365 do?
CallTo365 provides a cloud-based Microsoft Teams telephony platform that adds calling, contact center, and CRM integration capabilities to Microsoft Teams. The service enables businesses to make and receive calls, manage customer interactions, and integrate communications with CRM systems through Direct Routing and Session Border Controller technology, removing the need for on-premises PBX hardware.
Is CallTo365 a public or private company?
CallTo365 is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was CallTo365 founded?
CallTo365 was founded in 2020. It employs 11 to 50 people.
Where is CallTo365 based?
CallTo365 is headquartered in Utrecht, Netherlands, in the Europe region.
How does CallTo365 make money?
Four revenue lines are on record. Teams Telephony Subscription is the primary driver. The others are SIP Trunking Services, proof of Concept Services and phone Numbers.
Who are CallTo365's main competitors?
Broad incumbents on record are Talkdesk, Five9, 8x8, Genesys, Microsoft Teams Phone, Vonage (Ericsson) and RingCentral. Direct peers are Content Guru, Luware and Anywhere365.
Does CallTo365 have an API?
Yes. CallTo365 provides webhook functionality as part of their PBX system. Webhooks can be used to integrate with external systems such as Google Analytics, trigger automatic call forwarding based on CRM data (e.g., forwarding to accounting if caller has outstanding invoices), automate appointments at healthcare institutions, and automate prescription refills at pharmacies. The PBX supports HTTP/HTTPS requests with variables such as ${data}, ${unique_id}, ${called_did}, ${caller_number}, and more for request URIs and request bodies. The API supports both POST and GET request methods with response body regexp matching for validation.
What industry is CallTo365 in?
CallTo365's product category is Cloud Communications. Its primary akta.pro industry code is HDAIAHAB, Cloud PBX & Hosted Telephony, with a secondary code of HDAIAHAF, Contact Center (CCaaS) & Customer Engagement Voice. Its NAICS code is 517 and its SIC code is 4813.