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The Restcomm SIP stack is an efficient, scalable, rock-solid, and flexible SIP framework and implementation of the JAIN-SIP JSR-32 Java Specification. It includes support for the most common annexes of the RFC 3261 SIP specification with enhancements to support our SIP Servlets and JAIN-SLEE Application Servers, WebRTC, and other products.


The commercial version of our SIP stack is supported directly by Telestax and provides support for


  • Replication for handling failover scenarios
  • Load balancing to ensure High Availability (HA)
JSR-32 JAIN-SIP framework
Replication for handling failover scenarios
Load Balancing to ensure High Availability
Open Source
Commercial Release Enhancements

Join the Restcomm Open Source community

We would be happy to have you in our global family. You can commit code and patches directly to the project’s source code repository.