Originally forked from OpenSER, OpenSIPS is an open source SIP server that boasts an easily scalable, modular design. OpenSIPS works effectively with many different types of media, including voice, message, and video.
It carries on the tradition established by OpenSER, building high-quality SIP products supported by an open source community. OpenSIPS is designed to be flexible in operating a variety of SIP server configurations and capacities.