Wazo.io
Asterisk
FreeSWITCH
FusionPBX
Kamailio
miniSIPServer
XiVO
VoipSwitch
React Native Elements
NativeBase
React Native Paper
React Native UI Kitten
React Native Starter
WithFrame
React Native Paper by Callstack
Shoutem UI toolkit
Asterisk - An open source telephony switching and private branch exchange service for Linux.
NativeBase - Experience the awesomeness of React Native without the pain
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
React Native Paper - React Native Paper is a high-quality, standard-compliant Material Design library that has you covered in all major use-cases.
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.
React Native UI Kitten - Customizable and reusable react-native component kit