What is OpenSIPS?
In 2005, the OpenSER project was created by Bogdan-Andrei Lancu of Voice System, and it quickly became recognised as one of the most proficient, powerful, and well known of all open-source SIP proxies. In 2008, due to trademark issues regarding the OpenSER name, Voice System renamed OpenSER as OpenSIPS. OpenSIPS is simply an acronym of Open Session Initiation Protocol Server, which is an open source implementation of a GPLed SIP server. Open source simply means that a product is completely accessible from a design and implementation perspective, and can be distributed free of charge.
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