libsofia-sip-ua0 1.12.11+20110422.1-2ubuntu1 (amd64 binary) in ubuntu trusty

 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.
 .
 The library is implemented in ANSI C, and provides an extensive
 set of features for implementing SIP/SIMPLE User-Agents. Highlights
 include full UDP/TCP/TLS support, IPv4/6 support, SIMPLE presence
 and messaging support, SIP offer/answer engine and numerous
 mechanisms for NAT/FW traversal.
 .
 This package provides the main library runtime files.