OpenSIPS (Open SIP Server) is a free and open-source SIP server. It is a mature product, with a wide range of features. OpenSIPS is used by service providers, carriers, enterprises and VoIP equipment manufacturers. It can be used as a stand-alone SIP server, or it can be used in a highly-scalable SIP trunking environment. OpenSIPS has many features that make it an attractive choice for VoIP service providers, including: - Support for a wide range of VoIP protocols - Excellent call quality - Scalability - Flexibility OpenSIPS is also very popular with developers, due to its open-source nature and because it can be easily extended with custom modules. If you are looking for a SIP server that is both powerful and flexible, then OpenSIPS is definitely worth considering.
OpenSIPS is a SIP proxy server that can be used to provide various SIP-related services, such as call routing, NAT traversal, and security. FreeSWITCH is a SIP-based softswitch that can be used to provide a variety of VoIP-related services, such as call termination, conference calling, and Voicemail.
Overall, opensips and freeswitch are both great services that have their own unique strengths and weaknesses. If you're looking for a robust and powerful VoIP solution, then opensips is a great option. However, if you're looking for a more user-friendly solution, then freeswitch may be a better option for you.