Centralised Call Simulator

A centralised VoIP traffic generator capable of reproducing virtually any SIP call scenario.

Centralised Call Simulator


Sigma is capable of reproducing a vast range of SIP call and load-testing scenarios to assist with troubleshooting and network analysis.
icon networking


As a centralised server, SIGMA can be accessed by different groups of users via a web GUI, managing the most complex networks.

icon exploration


Simulate virtually every call scenario and protocol message type. Both signalling and media can be easily simulated.

icon performance


The configurable and intuitive web portal can be set up to suit the needs of operational teams and the target network.


Call Simulation

SIGMA was developed based on Netaxis Solutions' 10 years of experience in testing, troubleshooting, integrating and maintaining SIP-based solutions. SIGMA scenario scripting meta-language allows users to build scenarios from the simplest to the most complex.
icon align-offset-displace
icon setup arrangement
Call Generation


The scripting language provides the basic building blocks (SIP message 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 testing scenarios. SIP messages can be modified precisely how a user needs them.
icon yes check mark

Service Availability

SIGMA also provides a service availability solution to perform periodic calls and check if platforms are responding successfully. Statistics about service availability are calculated and can generate alarms to alert NOC teams.

Call Interpretation

SIGMA can check every SIP header (presence/absence/content ) and the SIP call flow (sequence of messages), with controls for Packet Loss, Jitter, delay and PESQ. The platform can then judge whether test conditions were met successfully and produce alarms and reports for NOC teams to investigate.
Netaxis Sigma Centralised Call Simulator
Want to enhance your UC proposition?

Get in touch with our team and we’ll get you up and running quickly with minimal commitment and no stress.