Audio only communication cannot start

I’m using JsSIP and react-native-webrtc for audio only communication. I’ve managed to start session and get remote and local stream objects. Since I can’t use RTCView I can’t play audio. And since there is no audio transmitting, server gives a time out after a while and stops session. I can’t send or receive any sound. Can anyone help me with this situation? How can I start sending and receiving sound?