
Linphone - open source SIP client
SIP (VOIP) phoneGPL-3.0-only

Sipdroid
A SIP (VOIP) clientGPL-3.0-only

Lumicall
SIP softphoneGPL-3.0-or-later

baresip
VoIP User Agent app for Android based on baresip SIP libraryBSD-3-Clause

baresip+
VoIP User Agent app for Android based on baresip SIP libraryBSD-3-Clause

Jami
Share, freely and privatelyGPL-3.0-or-later

Nextcloud Talk
Have private video calls and chat using your own server.GPL-3.0-only