OpenSIPS

From SubmitYourSIP

OpenSIPS is a high performance SIP server recently forked from Kamailio (formerly OpenSER). Depending on the status of merges between SER, Kamailio, and OpenSIPS they all (usually) have similar functionality and configuration.

Major features:

• Can be a proxy, registrar, or redirect server
• UDP, TCP, and TLS support
• Supports IPv4 and IPv6
• Support for various DB backends
• Powerful programming features - AVPs, psuedo-variables, etc
• High performance