SIGMA is a centralised VoIP traffic generator able to reproduce every SIP call scenario in a flexible way. As a centralized server, SIGMA can be accessed by different groups of users via a web GUI.

This GUI provides access to a shared collection of call scenarios. These scenarios are made of SIP messages from the shared SIP messages library.
Flexibility being one of the main concerns, SIGMA comes with a powerful scenario scripting language and the possibility to modify every bit of the SIP messages.

SIGMA also provides a service availability solution. SIGMA can be scheduled to perform periodic calls and check if call is successful or not. Statistics about service availability are then calculated and alarms can be produced.

SIGMA also provides load testing functionality for VoIP platforms.

SIGMA was developed on the basis of Netaxis Solutions 10 years experience in testing, troubleshooting, integrating and maintaining SIP-based solutions. SIGMA scenarios scripting language is a meta-language allowing users to build scenarios from the simplest to the most complex. The scripting language provides the basic building blocks (SIP messages handling and RTP handling). These simple building blocks give the freedom to build every kind of SIP call flow.

There is no limitation to the structure of SIP messages used by the scenarios. SIP messages can be modified exactly the way the user wants.