IMS Network Architecture, source: researchgate.net Intro The OpenSIPS 3.5 release introduces support for OpenSIPS acting as a Diameter server, with the possibility of scripting generic Diameter Server interactions. This means that you will be able to add, tweak or remove the support for various Diameter requests by only re-deploying your opensips.cfg set of scripts (yes, … Continue reading Diameter Server Support for IMS Flows in OpenSIPS 3.5
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The realtime control, via flags or switches, is a critical aspect of any VoIP operation. The ability to manage the features in your system - like to toggle them on or off, to control their behavior - or the ability to manage the user's permissions (or capabilities), are all falling under the generic title of … Continue reading LaunchDarkly integration with OpenSIPS 3.5
OpenSIPS 3.5 took the challenge of providing a complete support for IMS solutions. And here we are talking about industry grade IMS solutions, exceeding the basic lab grade. So, the target is to provide a robust IMS support to be used in real-life industry solutions. To achieve this goal, a quite extensive stage of exploring, understanding … Continue reading IMS status in OpenSIPS 3.5
September 2023 marked the 3rd edition of OpenSIPIt -- the online interoperability testing event for VoIP, SIP and related open-source technologies. This edition, the event featured a hackathon as well, where developers could either try to win some rewards (sponsored by Sippy Software) by completing a specific C/Python coding task or just spend the time … Continue reading Thoughts after Our Participation in OpenSIPIt’03
When comes to the media/RTP side, one of the most common problem to be faced is the so called "one way audio", or "one party does not hear the other one, but vice-versa does". So, lets explore a bit how to troubleshoot such problems. But first, we need to understand how the media/RTP flows are … Continue reading Troubleshooting one way audio calls
Quite a few years have passed since the last set of stress tests were performed on OpenSIPS, with the performance numbers achieved at that time becoming less and less relevant with each new major release. As the number of features has grown, so has the complexity of the codebase -- making the alpha version of … Continue reading Stress-Testing OpenSIPS 3.4 LTS
Our previous post presented SIPssert - an OpenSIPS Testing framework that does conformance testing for VoIP platforms (and not only). In this post we will describe how the OpenSIPS project has already started to benefit from the SIPssert capabilities in order to detect and prevent bugs as well as to avoid regressions and ensure that … Continue reading SIPssert and the journey of testing OpenSIPS
If almost one year ago we were releasing the first results of the security audit performed by of Enable Security over the OpenSIPS 3.2 code, now is the right time for the full disclosure. What was missing? As per the initial post, we hold back all the information about how to reproduce the crashes. Why? … Continue reading OpenSIPS Security Audit, fully disclosed
After having received some positive feedback on our presentation on the topic at hand at ClueCon '22, let's go through a more detailed run-down of all steps required, from a cryptographic point of view, in order to first become a fictive STIR/SHAKEN CA (Certification Authority), then to begin issuing signed certificates for various (also fictive) … Continue reading How To Generate Self-Signed STIR/SHAKEN Certificates
In the previous iteration, OpenSIPS 3.2 introduced a first version of the support for Diameter protocol peering by leveraging the freeDiameter project and its excellent C libraries. Building on top of this, OpenSIPS 3.3 now offers a way of building and sending arbitrary Diameter protocol requests, from the opensips.cfg script. This brief post will teach … Continue reading Using the Diameter Client Capability of OpenSIPS 3.3
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