S

sip

using linphone's lib

Softphone als SIP-Client oder CTI-Client für den wwcommunicator.

LibeXosip2 stack integration for go.

small tool that formats Phonerlite's phonebook.csv into the Google contact file format, so you can then import your contacts into Google

GNU SIP Witch is a b2bua sip server originally designed for facilitating peer-to-peer communications and use with secure zrtp enabled endpoints.

A better SIP server library for NodeJS.