libsofia-sip-ua-dev 1.12.11+20110422.1+1e14eea~dfsg-3 (amd64 binary) in ubuntu kinetic

 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 the headers and libraries needed to build
 applications against the Sofia-SIP library.