Sofia-SIP library utilities Sofia-SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification. It can be used as a building block for SIP client software for uses such as VoIP, IM, and many other real-time and person-to-person communication services. This package provides a set of console tools and helper applications for use in scripts, testing and other uses. All the tools utilize the Sofia-SIP library.