Category: VoIP
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Caller ID in SIP
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Equipment receiving calls, whether a humble handset or a sophisticated Call centre ACD system, likes to know the identity of the caller. It may simply display the caller’s number on an LCD display, look it up in a directory so the caller’s name can be displayed or pre-populate a screen with information about the caller […]
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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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Fixing SIP header addresses – Introduction
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The main theme I explore in these articles is when and how a SIP Proxy should alter (or “fix”) embedded sender address information – IP and port – in a SIP request that it has received. The headers that are most relevant here are Via, Contact and Record-Route
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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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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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How to spot hacker INVITE requests
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By inspecting log reports from a number of different SIP Proxy servers, it has been possible to find some common factors across the many hacking attempts that are made against SIP servers.. The information available from these reports gives some insight into the most common SIP requests being sent by hackers to detect and probe […]
