为Linux用户准备的6个最好免费的 VoIP 软件
Twinkle is one of the best VoIP software for instant messaging communications using SIP protocols and also use for direct IP phone to IP phone communication.
Ekiga is free open source softphone and instant messenger application over the internet.
KPhone is a SIP UA for Linux, supporting a multitude of features.
Linephone is another excellent way to connect as internet phone or voice over IP phone ( VoIP). With linphone you can communicate freely with people over the internet, with voice, video, and text instant messaging.
Kiax is open sources softphone that provide a simple user interface for making VoIP calls.