Diomerc open source solution
Diomerc is an open source instant messaging and voice/video over IP (VoIP) phone that makes it possible to communicate freely with people over the internet via voice, video and text messaging. Since it follows open standards from the telecommunications industry (SIP, RTP), Diomerc is interoperable with most PBXs and SIP servers, including our own Diosip server, and can be used with any SIP VoIP operator.
Discover complementary products in our complete solution for instant messaging and IP-to-IP calls, such as Diomerc applications, Diomerc cross-platform VoIP SDK and Diosip server.
Diomerc iphone circulos



Diomerc for smartphones and tablets
Diomerc is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
Diomerc for desktop platforms
Diomerc Desktop, the brand new version of Diomerc for desktop platforms, is perfectly suited for both standard users with no specific knowledge of VoIP/SIP and for advanced audio/video calling use cases in a professional environment. It is fully SIP-based, for all calling, presence and IM features.
Diosip Server
Diosip is a complete, modular and scalable SIP server suite that includes proxy, presence, and group chat functions.
Our Apps
Diomerc for smartphones and tablets
Diomerc is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
Aplicacion 1 iphone
Diomerc for desktop platforms
Diomerc Desktop, the brand new version of Diomerc for desktop platforms, is perfectly suited for both standard users with no specific knowledge of VoIP/SIP and for advanced audio/video calling use cases in a professional environment.
It is fully SIP-based, for all calling, presence and IM features.
Diosip Server
Diosip is a complete, modular and scalable SIP server suite that includes proxy, presence, and group chat functions.
Diosip offers an easy-to-install SIP server solution, offering all the features required to deploy your own SIP service tuned for mobile or desktop applications, « out of the box ».

The free sip.diomerc.org SIP service has run on Diosip since 2011, and enables Diomerc users to create their own SIP addresses to connect with each other.
Proxy :
– NAT-aware with built-in media relay module and ICE/STUN support
– Interconnected with push notification systems
– High availability and cluster mode for large deployments
– High-level event logging for activity monitoring
– Digest and TLS client certificate authentication
Diosip manages SIP SUBSCRIBE and PUBLISH from client applications, in order to :
– Identify users of the service within the address book
– Provide users with real-time presence status
Group chat :
– Entirely SIP-based solution
– Efficient management of groups and participants
– Multi-device support
– Notification of group events (users joining or leaving, new admins etc.)
Diosip can be integrated into your SIP infrastructure for various purposes, for example IN THE CLOUD in order to run your own VoIP service, EMBEDDED in small hardware systems or in its PUSH GATEWAY mode of operation.