webRTC with Janus iOS swift

Question

I'm developing audio calling using webRTC and Janus.

below are my steps

1. peerconnection make offer

2. set local description of peerconnection

3. send message to socket
4. add local candidates to peerconnection
5. received message from socket
6. peerconnection set remote sdp
7. received remote media stream

But after receiving the stream also, it is not audible. If code is required, i can put the snippets on ask. Please help.