Tag: OpenSIPS
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Making OpenSIPS work as MS Teams SBC
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Introduction Alexey Vasilyev posted an article to the OpenSIPS blog site in September 2019 which explained how to use OpenSIPS as an SBC for Microsoft Teams Direct Routing: OpenSIPS as MS Teams SBC – Drops of wisdom, knowledge and news from OpenSIPS I am sure the OpenSIPS community is grateful to Alexey for sharing his […]
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Fixing SIP header addresses – Contact headers
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Part 3 of this series of articles focusses on the Contact header. In particular, I examine the use-cases where it is necessary to “fix” (or alter) a received Contact header. Contact headers work in close combination with Record-Route and Route headers in a mechanism known as loose routing. To get the most from this article […]
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Fixing SIP header addresses – Via headers
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In part 2, Via headers are put under the microscope. I examine how the address in the Via header is set by each node in the path; how and why it may differ from the source address. I will look at the functions available in OpenSIPS to detect and handle situations where the address in […]
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Contact and Record-Route headers explained
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Diagnosing some problems in the world of VoIP requires close inspection of the SIP messages being exchanged, but there are many occasions where a good understanding of loose routing will be invaluable. The headers that underpin loose routing are Contact, Record-Route and Route. In this post, I explain how they work and provide some insight […]
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Latency caused by UDP fragmentation
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While testing a WebRTC application recently, I noticed some unexpected delays in the execution of a series of lines in my OpenSIPS control script. For OpenSIPS to behave properly it is essential that the child threads don’t get blocked and that the lines in the script are executed at speed. Seeing a delay of several […]
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Using OpenSIPS in Docker
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In 2019, I presented a paper at the 2019 OpenSIPS Summit entitled ‘Docker, Clustering, Scalability – A case study’ You can watch my presentation on YouTube:
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WebRTC using OpenSIPS and RTPEngine
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In this article you will find tips, pointers and code snippets to help you get started with WebRTC using OpenSIPS and RTPEngine. At the end I have provided some notes and URL links that may be useful to anyone wishing to learn more about the media handling. In the initialisation section of opensips.cfg A listen […]
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Using the Clusterer Module for contact replication
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Summary In this, the second part of a three-part article about the Clusterer Module, I explain how I got on when testing a pair of OpenSIPS Registrar Proxies configured as a highly available cluster. The design, which uses Pacemaker to assign a floating IP to the currently active server, is described in some detail in […]
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HA Scenarios and the OpenSIPS Clusterer Module
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Summary System reliability and avoidance of down-time are themes that recur time and again with Smartvox customers. In this article I will review some of options available to a system designer who wants to build a highly available OpenSIPS solution, paying particular attention to the new Clusterer module which is at the heart of a set […]
