Today, VOIP softphones are used by millions of users worldwide to make voice and video calls. Pre-configured softphones like Skype are very popular among users. However, there are certain free VOIP softphone applications, that can be easily configured to work with the service provider of your choice, provided you have the required subscription. These softphone are not only free, but have all the advanced features for call recording, call transfer, call conferencing and contact management.

X_Lite 3.0: It is one of the most popular free VOIP softphone. X-Lite 3.0 comes with stunning interface and use Session Initiation Protocol(SIP) for all media communications. X-Lite also uses Quality of Service(QoS) feature to auto enhance to voice or video call quality. It also maintains complete call history with feature packed address book. X-Lite is also able to record voice and video calls on demand.


Ninja Lite: This softphone also supports both voice and video calls. Ninja Lite supports all advanced features like call recording, recent calls (Dialed, received and missed), address book, NAT/firewall support, skins, call timer, caller id, mute and much more. It also has built-in conferencing feature for multi-party talk.


SJPhone: I have used SJPhone personally along with Asterisk VOIP based router, to test some IP based applications. Very handy and light on the system. SJPhone uses SIP protocol for all media communication. An ideal softphone client while building a large internal VOIP server within your organization.


Firefly: Extremely light and best interface I have ever experienced. Firefly integrates fully featured voice mail system. It also includes drag and drop contact management system, which makes it very user friendly. After installation you can create an online account for easy call record history in real time. You can initiate multiple calls from Firefly at a given time, and can later turn it into a conference.


Express Talk: Another excellent VOIP softphone, which offers free voice and video calls between PC's. you can configure up to 6 calls on a single line, including conferencing feature. Express Talk can easily work behind NATs and Firewalls. Express Talk can be easily integrated with Microsoft address book for easy import and export of contacts. It also supports call transfer feature.