Developed by Belledonne Communications, Linphone is another popular VoIP application that lets you make free calls, as well as video calls. Linphone is not your ordinary VoIP app, as it is opensource and is constantly updated and developed by the community.
Linphone uses SIP for its connections, making your calls sound good while keeping bandwidth at a minimum. This is quite handy for users who have a tight restriction on their data plan. Linphone also offers video calls to other users using MPEG4 and H264 codecs, but it is only made available to ARMv7 devices. It also supports a wide variety of audio codecs like iLBC, G711, GSM, G722, and Silk, just to name a few. The app also introduces audio multi-call and conferencing if you have multiple users on the line. Linphone also features echo cancellation, address book integration, and call history.
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