Install sofia-sip-doc by entering the following commands in the terminal:
sudo apt update sudo apt install sofia-sip-doc
Description:
Sofia-SIP library documentation
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 library reference documentation.
Homepage: http://sofia-sip.sourceforge.net/
Version: 1.12.11+20110422.1-2.1build1
Section: universe/doc