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OpenSIPS (Open SIP Server) is a mature Open Source implementation of a SIP server. OpenSIPS is more than a SIP proxy/router as it includes application-level functionalities. OpenSIPS, as a SIP server, is the core component of any SIP-based VoIP solution.
With a very flexible and customizable routing engine, OpenSIPS unifies voice, video, IM and presence services in a highly efficient way, thanks to its scalable (modular) design.
What OpenSIPS has to offer, comes in a reliable and high-performance flavour - OpenSIPS is probably the fastest SIP server, with a throughput that confirms it as a solution up to enterprise or carrier-grade class.
Over the course of time, many tests (benchmarks) were done, resulting in a dense collection of various performance tests and measurements (database interaction, memory/cpu usage, etc) for OpenSIPS. The collection of benchmarks can be accessed here , and it showcases OpenSIPS as one of the fastest SIP Proxies on the market.
OpenSIPS is an easy to deploy software. It has :
Due to it's very flexible custom scripting language ( quite similar in syntax with the C language ) and to it's modular architecture, OpenSIPS can be easily used in a very wide range of scenarios - just plug in the needed modules for your desired functionalities and build on top of them by using OpenSIPS's scripting language.
OpenSIPS can be easily monitored and controlled from the outside, thanks to the MI interface, Event Interface and Statistics interface. Via the MI interface combined with the Statistics Interface, the administrator can pull various live stats ( like consumed memory, UDP queue size, overall load, number of ongoing calls, etc ) that can be used to monitor the status of an OpenSIPS box. Via the Event Interface, the administrator has the ability to get notified by OpenSIPS when certain events get triggered on the proxy side ( like DB access is slow, a gateways is down, the memory is getting filled up, etc ) and thus can take quick action when such an event happens.
OpenSIPS also has a Web Control Panel Application , OpenSIPS-CP. The interface can be used for provisioning OpenSIPS, but it can also display and monitor various statistics, as well as send control actions to OpenSIPS ( like instructing OpenSIPS to reload some database tables, etc ).
OpenSIPS has to offer many important and interesting features. To mention some of the most important ones:
Since OpenSIPS is known to work on most *nix based systems, installing and running OpenSIPS requires some very basic Linux knowledge.
Also, since OpenSIPS is a SIP proxy, you will most likely need some basic SIP knowledge in order to deploy / debug OpenSIPS in some more advanced scenarios.
Last but not least, you will be needing some basic programming logic knowledge - The OpenSIPS configuration file is text-based, written in an OpenSIPS custom language, very similar to the C language.
If you want to get started building platforms/solutions with OpenSIPS, here are a few steps that should help :