Handling SIP Redirect Requests in realtime

The SIP redirect mechanism is a simple and straight forward one  - the originally contacted destination indicates, via a 3xx reply, that a different set of destinations should be contacted. The SIP redirect is mainly used for calls (for INVITE requests), even if the RFC3261 does not limit it to that. Usage cases The primary … Continue reading Handling SIP Redirect Requests in realtime

Clustering Presence Services with OpenSIPS 2.4

OpenSIPS 2.4 is all about clustering and SIP presence is an important service that delivers a large variety of functionalities like end-to-end user presence, BLF, SLA and more. We need to consider clustering for presence as much as presence is a service with a large appetite for storage and processing - presence is mainly about … Continue reading Clustering Presence Services with OpenSIPS 2.4

Clustering ongoing calls with OpenSIPS 2.4

Dialog replication in OpenSIPS has been around since version 1.10, when it became clear that sharing real-time data through a database is no longer feasible in a large VoIP platform. Further steps in this direction have been made in 2.2, with the advent of the clusterer module, which manages OpenSIPS instances and their inter-communication. But have we … Continue reading Clustering ongoing calls with OpenSIPS 2.4

Full Anycast support in OpenSIPS 2.4

The advantages of doing Load Balancing and High Availability without any particular requirements from the clients side are starting to make Anycast IPs more and more appealing in the VoIP world. But are you actually using the best out of it? This article describes how you can use OpenSIPS 2.4 to make the best use of … Continue reading Full Anycast support in OpenSIPS 2.4

The new Clustering Engine of OpenSIPS 2.4

Before even thinking of building clustering support for high level services like User Location, Dialog Tracking or SIP Presence, it is mandatory to have in place a powerful and flexible clustering engine. Such an engine will become the reliable foundation  for approaching more complex clustering scenarios. And this is what we did in OpenSIPS 2.4 … Continue reading The new Clustering Engine of OpenSIPS 2.4

Audio Recording and Speech Detection Experiments with OpenSIPS

What are our users really talking about all the time? Let's find out! RTPEngine is a proxy for RTP traffic and other UDP based media for VoIP and webRTC., meant to be used in OpenSIPS and other proxies as a drop-in replacement for rtpproxy with many advanced features, including: webRTC support as ICE and SRTP Bridging … Continue reading Audio Recording and Speech Detection Experiments with OpenSIPS

How To Script Advanced FreeSWITCH Integrations with OpenSIPS 2.4

Happy New Year 2018! In this follow-up article, we're going to take a look at a major feature that Santa merged into the OpenSIPS development branch, just about a couple of days before Christmas: a series of advanced FreeSWITCH integration capabilities. It is now possible to fully control FreeSWITCH within the OpenSIPS script. This is … Continue reading How To Script Advanced FreeSWITCH Integrations with OpenSIPS 2.4

FreeSWITCH Integration Video

Over at FreeSWITCH, as an open-source multimedia software, we rely on our community for support. We like to foster that support by producing resources for our community. Whether it is FreeSWITCH tutorials, ClueCon Weekly Conference calls, or the ClueCon Community conference, giving to the community has always been important to us. We are always excited … Continue reading FreeSWITCH Integration Video