In this day and age, hardly anyone ever uses landline phones anymore. On the other hand, people don’t want to use up their cellphone credit just chatting with friends. Using your computer to make calls over VoIP is simple and easy, no matter what your OS is. Check out some of these VoIP applications for Linux that works great for personal or small businesses.

Skype for Linux

Skype is usually the first service that comes into mind when it comes to VoIP or video chatting online. Skype for Linux is equipped with all the features you’ll find in its other OS versions, like screen sharing, quick add, group chats with up to 150 participants, and conference calls. You can also use Skype to call mobile phones and landline numbers for a very small fee.

Asterisk

Asterisk is an open-source VoIP engine with a tool kit often used by small business owners who want to keep communications costs down. Its features include call waiting, call transfer, caller ID, and text-to-speech recognition among others.

Ekiga

Ekiga is another open-source VoIP and video conferencing application especially designed for GNOME. Its features include an advanced contact book, call hold, forwarding, and transferring, configurable sound events, and others. It can also handle several network interfaces at once and integrates well with Novell Evolution and Asterisk.

Linphone

Linphone can work with most webcams to provide voice conference and video conference calls for users, as well as an instant messaging/text chat capability. Although you can use Linphone to call mobile numbers and landlines, you’ll be charged a small fee. Linphone is ideal for users who want a simple VoIP app without the bells and whistles.

Callweaver

Callweaver is an independent, cross-platform, open-source VoIP app that was derived from Asterisk. It supports digital and analog PSTN telephony and has standard VoIP features like conference call, call forwarding, and call queue management. It even has support for fax-over-IP.

Source