What is YXA?

YXA is SIP software written in Erlang (Erlang is a programming language written by Ericsson).

YXA is both a transaction stateful SIP stack, and a set of SIP server applications.

YXA is Open Source, and released under a three clause BSD license.

Main features

RFC3261 compliant SIP-server, capable of everything a generic domain needs :
- Registrar that keeps track of your users
- Handles incoming SIP requests to your domain
- Handles routing of requests from your users to remote domains
- TCP, UDP and TLS (including SIPS) support
- Automatically maps e-mail addresses of your users to their SIP addresses, if you have the e-mail addresses in LDAP
- Handles multiple domains using a single server instance
ENUM support for PSTN-bypass whenever possible
IPv6 support
Forking, both parallel and sequential
CPL (RFC3880) support for advanced user-control of events (currently incoming calls only)
Modular user database, currently with LDAP, Mnesia, MySQL and text-file backends
PSTN destination access control (per user or for anonymous users)

To create a robust SIP server/stack capable of serving tens of thousands of users
Scalability through the use of distributed operation
Short time-to-market for new functionality (high-level programming language)
Interoperability through standards compliance

2010-03-30: YXA source code is now hosted at GitHub, and I'm preparing for a 1.1 release.

2007-11-05: YXA 1.0 is released! Two years after the first stable release, a very stable and mature SIP server is available. Enjoy.