Linphone

Name

Linphone

Legal name

SARL BELLEDONNE COMMUNICATIONS

Website

https://linphone.org

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

11–50 employees

Short description

Linphone, operated by France-based Belledonne Communications, provides open-source VoIP, video conferencing, and secure instant messaging software built on the SIP standard, serving European enterprises, telecoms, defense customers, and developers via freemium and white-label professional services.

Ownership category

akta.pro rank

Product category

VoIP Communications Software

NAICS

Software Publishers (5132), All Other Telecommunications (517810), Telecommunications (517)

SIC

Communications Services, Nec (4899), Services-Telephone Interconnect Systems (7385), Services-Prepackaged Software (7372)

akta.pro primary industry

Voice Calling (VoIP) Apps (BPAMACAC)

akta.pro secondary industries

VoIP Access & ITSP Services (HDAIAHAD), Remote Unlock & Visitor Management (Mobile Credentials/Packages) (HSAHAIAL)

Keywords

• VoIP softphone
• SIP communications
• Video conferencing software
• Instant messaging SDK
• Secure communications

Headquarters

HQ city

Grenoble

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Software

Cost components

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

Revenue model

1. Free SIP Service: Free VoIP service for audio/video calls and instant messaging using the sip.linphone.org domain, provided at no cost to individual users. This freemium offering drives user adoption and community growth.
2. Proprietary Software Licensing: Proprietary licensing of Linphone application, SDK, and server software available for purchase, offering an alternative to the open source GPLv3 license for organizations requiring proprietary usage rights.
3. Rebranding/White-Label Services: Customization of Linphone softphone to customer brand identity and enterprise requirements, providing white-label solutions for MSPs, VoIP operators, and organizations seeking branded communication apps.
4. Support and Maintenance Contracts: Annual maintenance contracts guaranteeing solution longevity, including technical support, bug fixes, and updates for enterprise customers with active support agreements.
5. Server Installation and Configuration: Professional services for optimized server deployment, helping organizations set up and configure Flexisip infrastructure.
6. Custom Development: Bespoke feature development and customization services, with personalized quotes for organizations requiring specific functionality or integration.

Pricing tiers

Go-to-market motion2 records

Distribution channels6 records

Marketing channels7 records

Core offering

Linphone develops and provides an open-source VoIP communications platform consisting of a cross-platform softphone, a modular SIP-based server suite (Flexisip), and an embeddable SDK (Liblinphone) for voice, video, and instant messaging. The company monetizes through a free consumer SIP service, proprietary commercial licensing, white-label/rebranding, support contracts, server installation, and custom development for organizations requiring sovereign or embedded deployments.

Product overview

Linphone is a comprehensive VoIP communications platform developed by Belledonne Communications, a French open source company founded in 2010. The product suite consists of three core components: the Linphone softphone (complete application for VoIP, video, and instant messaging across iOS, Android, macOS, Windows, and Linux), the Flexisip server (SIP-based server suite for account management, presence, chat, and conferences), and the Liblinphone SDK (cross-platform library for embedding VoIP capabilities into custom applications). Additional offerings include Mediastreamer2 (media streaming engine), bcg729 (G.729 codec), encryption modules with ZRTP and post-quantum protection, Flexisip Account Manager (web administration platform), and white-label customization services. The platform supports both open source (GPL v3) and proprietary licensing models.

Differentiator

Problem solved

Functional benefit

Brands

• Liblinphone: Cross-platform SDK (Software Development Kit) on which Linphone is built, enabling VoIP and instant messaging integration into custom applications.
• Flexisip
• Linphone Free SIP Service

Products and services

• Linphone Softphone Complete softphone application for VoIP, video conferencing, and instant messaging available on iOS, Android, macOS, Windows, and Linux. Supports SIP protocol for calling, presence, and IM. Offered under open source (GPLv3) or proprietary license with white-label customization.
• Flexisip Server SIP-based server suite providing account management, configuration routing, chat, conference, and presence services. Modular architecture suitable for high-volume deployments with PSTN connectivity via B2BUA. Available as open source (AGPLv3) or proprietary license.
• Liblinphone SDK Cross-platform C library underlying the Linphone softphone. Enables VoIP and IM feature integration into mobile and desktop applications with optimized quality for embedded systems. Available as open source or proprietary license.
• Mediastreamer2 Media streaming engine used within Linphone for real-time audio and video handling, capturing, encoding, and transmission management.
• bcg729 Implementation of the ITU G.729 audio codec providing narrowband speech compression for VoIP applications.
• Flexisip Account Manager Web administration platform including FlexiAPI (web API for account and configuration management), remote configuration server, and web administration interface for managing SIP accounts.
• White Label Softphone Customization service allowing organizations to rebrand Linphone with their own brand identity and enterprise-specific requirements for white-label deployment.
• Linphone Free SIP Service Free SIP service allowing users to create a SIP account with the sip.linphone.org domain for audio/video calls, instant messaging, and videoconferencing capabilities.

Named customers3 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

AI capability1 record

Feature6 records

Partnerships

Seven partnerships are on record, tiered core, supporting and infrastructure.

• Orange BusinesscoreTechnology or IntegrationOrange Business selected Linphone as a technology partner for its Live Collaboration sovereign cloud suite. Linphone provides VoIP and instant messaging capabilities within Orange's sovereign collaboration platform hosted on French SecNumCloud-qualified infrastructure, targeting European organizations seeking alternatives to concentrated global collaboration vendors.
• eXo PlatformcoreTechnology or IntegrationTechnology partner within Orange Business Live Collaboration suite, contributing collaboration platform technology to the sovereign European cloud collaboration ecosystem.
• BlueMindcoreTechnology or IntegrationTechnology partner within Orange Business Live Collaboration suite, providing messaging and collaboration server technology.
• PexipcoreTechnology or IntegrationTechnology partner within Orange Business Live Collaboration suite, contributing video conferencing interoperability technology.
• MailinblacksupportingTechnology or IntegrationTechnology partner within Orange Business Live Collaboration suite, providing secure email solutions.
• OnlyOfficesupportingTechnology or IntegrationTechnology partner within Orange Business Live Collaboration suite, providing document co-editing capabilities.
• OVH SASinfrastructureOthersCloud infrastructure provider hosting the free Linphone SIP service on machines located in France and Germany. OVH SAS provides the underlying compute and hosting services supporting Linphone's VoIP service operations.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• FreeSWITCH (SignalWire): Open-source telephony platform supporting SIP, voice, video, and messaging, frequently paired with softphone clients. Linphone competes for the same developer/SIP-server workloads and is often considered alongside FreeSWITCH for self-hosted VoIP stacks.
• 3CX: Commercial PBX/UC software vendor with its own softphone and SIP server stack, selling to SMBs and MSPs. Overlaps with Linphone on the white-label softphone, support contracts, and operator/MSP distribution model.
• Wire: End-to-end encrypted messaging, voice, and video platform with strong enterprise/government focus and European roots. Comparable to Linphone's secure-messaging and voice offering on cryptography, European positioning, and regulated-buyer adoption.
• Nextcloud: European open-source collaboration platform (files, chat, video through Nextcloud Talk). Competitor for the same sovereign, EU-hosted collaboration stack that Linphone targets via Orange Business' Live Collaboration suite.
• Jitsi (8x8): Open-source WebRTC-based video, voice, and conferencing stack comparable to Linphone's SIP softphone/server approach. Both projects target developers and enterprises seeking self-hosted, standards-based real-time communications and compete for the same open-source-real-time-comms mindshare.
• Asterisk (Sangoma): The dominant open-source PBX/telephony platform; Linphone's Flexisip server competes for similar SIP server / telephony workloads, while Linphone's softphone integrates with Asterisk-style deployments in the same VoIP market.
• Element (Matrix.org): Provider of Matrix-based secure messaging and VoIP clients, often adopted by governments and enterprises seeking sovereign communications. Overlaps with Linphone on secure IM, voice, and European open-source positioning.

Broad incumbents

• Zoom Communications: Dominant UCaaS incumbent bundling voice, video, chat, and SIP telephony. Competes with Linphone for enterprise communications budgets, particularly among buyers that prefer a single vendor stack over a self-hosted SIP deployment.
• Microsoft (Teams Phone): Microsoft Teams Phone wraps carrier PSTN/SIP connectivity into the broader Microsoft 365 collaboration bundle. Sets the procurement default against which Linphone's sovereign, open-source SIP stack must justify itself in mid-market and enterprise deals.

Emerging players

• Signal Foundation: Open-source end-to-end encrypted messaging and voice/video app with strong privacy brand. Comparable to Linphone on the encryption-led open-source communications thesis, though primarily consumer- rather than operator/OEM-focused.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

• GitHubgitlab.linphone.org/BC
• YouTubeyoutube.com/@belledonnecommunications9422
• LinkedInlinkedin.com/company/belledonne-communications

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about Linphone