Belledonne Communications was founded in 2010 by Simon Morlat, the original author of Linphone, and Jehan Monnier.

Belledonne Communications is located in Grenoble, France.


The name ‘Belledonne′ takes root in the name of a mountain range in the northern French Alps located near to the city of Grenoble. Grenoble is sometimes referred as the ‘French Silicon Valley′ because of the presence of highly qualified engineers and a wide range of different size companies working in domains of electronics, nano-technologies and software services.

BC was founded in 2010 by Simon Morlat, the original author of Linphone, and Jehan Monnier, the co-founder of Belledonne Communications, who spent respectively 9 and 10 years in the Telecom division of Hewlett Packard. »


Since it was launched in 2001 as the very first open source application using SIP on Linux, Linphone has become very popular, especially in the open source community. Our engineering team is consistently working on the Linphone project to support latest versions of most popular platforms and provide advanced Voice/Video and Instant Messaging features.

  • 12 engineers working full time on Linphone and Flexisip projects
  • 300 000 users of our free SIP service
  • 900 000 downloads of Linphone on mobile phones
  • 2 000 visits per day on our website


  • Software development in C++11, C, Java, C#, Objective C
  • Media streaming engine and signal processing (voice and video)
  • Communication Protocols (SIP, RTP, ICE, TURN, Codecs...)
  • Secure communications (SIP TLS, SRTP, SRTP-DTLS, zRTP), including end-to-end messaging encryption
  • Mobile applications development (iOS, Android, Qt, Xamarin…)


Belledonne communications offers career opportunities to talented people who want to join a young R&D company located in the heart of the Alps. Please send applications to