A Better Way of Saying “Thank You!” to OpenSIPS Contributors

As time goes by, code, pull requests and patches for an open-source project will naturally keep arriving in a steady stream.  Depending on the volume of these contributions, some projects end up doing just well with a single maintainer, while others require an entire team of maintainers, each specializing in one of the project's major … Continue reading A Better Way of Saying “Thank You!” to OpenSIPS Contributors

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