Introduction

Flexisip is a complete, modular and scalable SIP server suite written in modern C++.

Flexisip instances can be deployed on server machines to run a SIP VoIP service. The free sip.linphone.org SIP service has run on Flexisip since 2011, and enables Linphone users to create SIP addresses in order to connect with each other.

It can also be embedded and run perfectly on small hardware systems.

Flexisip comprises the following servers, controlled as systemD services:

• Proxy
• Presence
• Conference (IM, audio, video)
• B2BUA
• Regevent
• Voicemail

It also includes a push-notification service, to deliver SIP incoming calls or text messages on mobile devices where push-notifications are required to receive information when the app is not active in the foreground.

The project was started by Belledonne Communications in 2011. The focus was to develop a SIP proxy solution easy to install, configure and maintain, and offering all the required behaviors to deploy a SIP service tuned for mobile applications.

License

Copyright © Belledonne Communications

Flexisip is dual licensed, and can be licensed and distributed:

• under a GNU Affero GPLv3 license for free (see COPYING file for details)
• under a proprietary license, for closed source projects. Contact Belledonne Communications for any question about costs and services.