is a leading mobile communications service that lets anyone text, talk and share for free or cheaply.

Why did you select our softwares and services to achieve your project?
We chose Linphone (and the support services from Belledonne) for several reasons:
-   A strong commitment to Android & iOS platform parity
-   A well documented library for both Java and C
-   Quick turnaround on any questions we have or bugs we report

What do you think about our support and development assistance services?

The Belledonne support structure is world class! Since our initial integration efforts we’ve had close communication with their engineering team and support staff. Any problems we’ve had were quickly resolved or prioritized in upcoming releases.
We couldn’t be happier!

What kind of issues has our team helped you solve?
Most recently, Belledonne was able to help us an issue with IPv6 that affected both Android and iOS. This was very important to us since Apple had recently added product update requirements related to this network protocol.

If one of your contacts wanted to launch a SIP project, would you recommend us?
Absolutely! If we were asked to recommend a SIP solution that was easy to integrate, extend, and support, Belledonne’s Linphone product would be at the top of our list.


Taiwan Mobile is a Taiwanese telecom operator which has developed the successful application M+ Messenger for iOS and Android.


Why did you select our software and services to achieve your project?
The reasons to motivate us to select your software are as follows:
(1) Excellent quality of software.
(2) Premium technical support.

What do you think about our support and development assistance services?
Both of support and assistance services are excellent.

What kind of issues has our team helped you solve?
(1) Issues about support of implementation of new codec such as AMR.
(2) Issues about support of new features such as Instant Messaging.
(3) Issues about improvement of voice and video quality.
(4) Issues about proprietary source code licensing.
(5) Issues about IOT over VoIP network.


With more than 200 customers worldwide, Linphone and its components are drivers of innovation in many sectors: telecommunications, secure communications, social networking, home automation, Telepresence, IoT, etc.

Our customer portfolio comprises a wide range of companies, from small start-ups to large global groups, including telecom operators, Over The Top (OTT) service providers, Internet Telephony Service Providers (ITSP), builders of intercom systems, secure apps developers, IT software and services providers, or hardware manufacturers.

The following companies are the customers that we are entitled to speak about.


Yolla Calls

logo GO4YU With Yolla app, the Estonian company Yolla Calls International ÖÜ intends to change the way people communicate with those abroad. Since 2015 with more than half a million users, Yolla gives the possibility to call any phone worldwide cheaply, no matter if the callee has the app or not.

Olga Alp, Management Board Member : "We have evaluated some options and it seems like you have offered the best solution for us, with the support and assistance we needed and for acceptable price. it is great you do offer such services and we really need your help with various technical issues we face once in a while."

Acer Cloud Technology

logo GO4YU Acer Cloud Technology, Inc. is part of Acer, Inc., a Taiwanese multinational hardware and electronics corporation, specializing in advanced electronics technology.

Nettia OY

logo GO4YU Nettia is a Finnish company which integrates Linphone in its VoIP solution to provide High qualitiy and cheap international and local calls.


logo GO4YU Go4Yu is a Serbian company, partly owned by Telekom Serbia - the leading telecommunications operator in the Balkans - with offices in the USA, Canada and Austria. This company offers a Talk&Text app named Go4Yu Calling, together with fixed telephony services.

Ratko Drobnjak, GO4YU's CTO, has chosen Belledonne Communications : "We test other platforms as well, but your software shows best results. (…) We are happy with your support."

PT. Invision

logo PT. Invision PT. INVISION ASTRINDO PRATAMA is an Indonesian communication technology company, which positions itself as one of the leading call centre application companies in Indonesia and provides a complete range of advanced software solutions like Interactive Voice Response, Computer Technology Integration or Voice Recording Systems.
Invision chose Linphone and Flexisip to develop their multi-platform VoIP application.


logo BarnardSoft BarnardSoft is a Japanese software company specializing in the field of communication and network, which is developing network monitoring or VoIP-related systems to make services utilizing the Internet and IT technology true.

Primo Connect

logo Primo Connect Primo Connect is a global communications platform that focuses on delivering International Long Distance calling video and messaging with focus on not only app to app calling but app to PSTN enablement as well.

“We selected Belledonne Communications because of their expertise in the voice and video communications market and our partners have already been using them with great success for several years. We would be happy to recommend them.” said Jonathan Lin, General Manager of Primo connect.


logo Beam Privus is a Swiss-based company, born out of their experience in real world digital surveillance and the urgent need to bring privacy back under the control of the individual.

We tested many VoIP stacks and libraries over the years and Linphone was our 1st choice for SecurLine due to the quality, modularity and transparency of its code.” said Henrique Corrêa da Silva, CEO of Privus.

Beam Messenger

logo Beam Beam Propulsion Lab Inc. offers a real time communication application for instant typing and transmission of text.

Alec Gordon, CEO of Beam Propulsion Lab Inc. : “We would recommend Belledonne Communications to our network due to the personal attention involved in helping us work out the technical challenges, and the rapid rate of response that has remained throughout.


logo Transdata MegaLabs is a 100% subsidiary of MegaFon, leading Russian telephone company. MegaLabs is specialized in digital services such as content & media, financial services, cloud computing, mobile advertising, M2M and mHealth.

Transdata Global Limited

logo Transdata Transdata Global Limited is a Hongkong based company working on telecom domain. Transdata has set a benchmark in the industry with its global standard products. OTT applications and dialers are some of the products that has made wonders in the telecom sectors.

John Mathew, CEO of Transdata Global Limited : “The project is significantly active. Apps are stable and mature

4Com PLC

logo 4com 4Com PLC was founded in 1999 by Daron Hutt with the aim of improving the communications services of the UK’s SME market. Since 1999, they have grown to over 300 people and currently provide 10,000+ UK businesses with phone systems.

4Com has choosen Belledonne Communications because :"After trying different SIP libraries and solutions for our Android project we came across Linphone which offered more functionality than anything else available [...]" said Jamie Hibard, Lead Developper at 4Com PLC.

Urmet S.p.A.

logo Urmet Urmet S.p.A. is a communication and security specialist which designs, develops and sells building automation products and systems. Urmet is specialized in a broad range of products that speed up installation and simplify function management, for residential, office and industrial buildings: Home Automation, Video Door Phone and Door Phone Systems, Telephony, etc.

VTC Secure

VTCSecure in an international technology company which creates and implements innovative forms of telecommunication, especially for members of the disabled community. They have developed a solution based on Liblinphone, which ensures equal and effective communications for all and principally for the Deaf and Hard of Hearing community, by using Real-Time Text in their application.

VTCSecure has choosen Belledonne Communications to help them develop their application : "The team helped us solve SIP call setup issues, codec issues and with the development of new features. Both the support and development assistance are great. It was easy to quickly add core functionality and to build on top of that."

BTicino S.p.A.

BTicino S.p.A. proposes solutions for the energy distribution, for the control of light and for the communication through intercoms solutions. As part of the Legrand Group since 1989, a world specialist in electrical and digital building infrastructures, BTicino creates innovative video door entry systems with a solution for any project.

"We searched for a VOIP solution that was suitable for mobile applications and linux embedded, that can be both mature for a real video door entry application and at the same time customizable for our needs. […] We are working with a very competent team, available for answering doubts and giving right tips and solutions". Mauro Sarchi, Project Leader at BTicino S.p.A.


Logo textPlus TextPlus is a leading mobile communications service that lets anyone text, talk and share for free or cheaply. Its open network connects over 110 million people worldwide through a chart-leading app for iOS, Android and Windows smartphones and devices including iPod touch and tablets.

"The Belledonne support structure is world class! Since our initial integration efforts we’ve had close communication with their engineering team and support staff. Any problems we’ve had were quickly resolved or prioritized in upcoming releases. We couldn’t be happier!". Samuel Braff, Vice President of textPlus, Inc.


Eloquant logo ELOQUANT has a real expertise in Customer Relationship and provides a comprehensive software solution that can manage interactions and feedback.

"We choose Belledonne Communications because you are a leader for this particular Telecom market. We appreciated regular deliveries and your very reactive support. You helped us manage a large number (hundreds) of phone calls in real time." Bénédicte Bouché, R&D manager at Eloquant.

A2 TECH Inc.

Lockfone logo A2 TECH Inc., the editor of Lockfone app, develops mobile solutions to provide secure and confidential communication.

Alber Arditi, CEO of A2 TECH Inc., chose Belledonne Communication's team : "Just because they know what they are doing. They are the masters of this subject".


CommuniTake crafts security, care and management solutions to provide people and businesses better mobile use. CommuniTake delivers a comprehensive Mobility platform that unifies highly secure device, smart Mobility Management, robust multi-channel support, and core Android Internet of Things.

The CommuniTake solutions suite
- enables complete protection against mobile wiretapping, data theft and malicious attacks;
- manages mobile resources, processes and security to effectively operate business mobility.


E-Group is a software group specialized in information security, secure financial payment transactions, and smart multimedia messaging products and services. E-Group has unique cryptographic data security and communication solutions for large corporate and special government services sectors where confidentiality of information really matters.

E-Group has chosen Linphone and Belledonne Comunications tunnel solution "Because they’re well-made, open-source and available on multiple platforms. Linphone’s codebase is robust, maintained and continuously improved.Another big upside was that we were able to create fully working prototypes before actually licensing Linphone, through the GPL model. After trying Linphone out, it was an obvious choice." said Antal Kuthy, CEO of E-Group.


Dencrypt works within the field of encrypted communication and offers solutions for securing mobile communication against eavesdropping. They are specialized in dynamic encryption and focus on combining encryption technology with a user-friendly operation.

"With Linphone and FlexiSIP you get a good head start for developing secure VoIP solutions. The ZRTP protocol is supported out of the box, and PolarSSL is a good choice for TLS. Furthermore, when working with secure VoIP systems, it is very important that vulnerabilities and security issues are identified and corrected. We believe that an active community and active developers are the best mean to ensure that the products remains secure." Soren Sennels, CEO of Dencrypt.

Intel Education Service Corps

In Southern Africa, a rural community has gone from isolation to 21st century technology with help from Linphone and Intel Corporation. Chikanta is a village in Zambia that was, until recently, 100 kilometers from the nearest high school. Now, it’s the site of a school that provides not only basic education, but access to a solar-powered computer lab with PCs and tablets.

In 2014, a team of five Intel volunteers was preparing to travel to the school when the principal asked if they could enable his teachers and staff to communicate with each other across the large campus and residential buildings. The mobile phone network has not quite reached Twachiyanda in a reliable way, and the cost of phone service is not easy for teachers and students to afford even when you can find a signal, ideally standing on top of the school’s new water tower in the center of campus.

The team identified Linphone as the perfect solution to enable text messaging, audio and video calling across the campus. That was the easy part, but setting it up would be a challenge. They thought back to the water tower the principal had described and came up with a plan. While on site, the Intel team installed a carrier-grade Wi-Fi router on top of the tower, along with a solar panel and battery.

Now, teachers and staff can use one of the school’s tablets or PCs to easily communicate with each other, at any time of the day and even during the rainy season. And as the teachers and students get access to more devices, the Linphone-based system can scale accordingly. For more information about this project please visit www.intel.com/servicecorps


FKWorlds has been founded by Fabrice Kerhervé, a passionate entrepreneur specialized in social networking. FKWorlds App is designed for iPhone and for Android smartphones to show immediately at any time and everywhere all advantages of FKWorlds acceptance terminals : geolocation, payment system, e-wallet electronic, FKiss buzz tool (a brand new tool to start and manage advertising or buzz campaign).

Orange Vallée

Orange Vallée, a subsidiary of the Orange Group in charge of innovation and development, has developed the application Libon for iOS and Android, based on Liblinphone, the VoIP engine SDK developed by Belledonne Communications.

Libon is an all-in-one communications app for iPhone and Android, with features like customized greetings for each of contacts, instant messages and free HD-quality calls to Libon contacts. 

Libon’s main features are:
- Unlimited free HD calls to all Libon users. The Premium option allows to make international calls to landlines and mobiles.
- Free instant messages between Libon users
- Visual voicemail


BT is one of the world’s leading communications services companies, serving the needs of customers in the UK and in more than 170 countries worldwide. Their main activities are the provision of fixed-line services, broadband, mobile and TV products and services as well as networked IT services.

"We have used support services and all were found fast and effective." Laurie Booton, Requieremets Lead - Mobile Applications.


Thales Group is a French multinational company that designs and builds electrical systems and provides services for the aerospace, defense, transportation and security markets.

Xylotech Integration Technology

Xylotech Integration Technology is an IT system integrator and solution provider based in Singapore. They have chosen the core engine of Linphone to develop and custom the Amorvone Client on Windows Desktop and Android as well as be integrated with their own SIP Server.



Swisscom is Switzerland’s leading telecoms provider.

"We chose Belledonne Communications because of your outstanding technology knowledge around voice over IP and Media Engine. In addition you have by far the best quality price ratio on the current market."


Almira Labs

Almira Labs is a software developer of value-added services (VAS) for the telecommunications industry based in Spain.


"Everyone at Belledonne is very professional and results oriented. Our work during the project was smooth and straight. We are happy we selected Belledonne for our softphone delivery. The softphone is more than we expected. Everything works like a charm. We will be glad to recommend Belledonne to anyone interested in launching a softphone in the


Amphitech is a French manufacturer of doorphones, supervision and monitoring devices.



Taiwan Mobile

Taiwan Mobile is a GSM mobile phone operator based in Taiwan.

"Both of support and assistance services are excellent."

Bouygues Telecom

Bouygues Telecom is one of the leading telecom operators in France. The company offers mobile and fixe telephony and provides internet and television services.



Linkyes is a Taiwanese company which developes mobile phone applications.




The VoIP audio/video calling feature of the TextMe mobile application is powered by the liblinphone engine.




Busch Jaeger Elektro GmbH

Belledonne Communications provides them with support and develops new linphone features used by their intelligent KNX touch panels.



Axtel is the second largest telecom operator in Mexico.
Belledonne Communications provides them with various telecom server-side software technologies.


Mentor Electronics

This company develops electronic devices. They use Linphone for their VoIP products.