Audio call works fine with two devices on same Wifi, does not work if different Wifi's or mobile network

Expected behavior

I’d expect the audio streams to connect and work regardless of being on different Wifi networks.

Observerd behavior

Connection state says connected and ICE Candidate state is completed. Yet neither caller or callee can hear each other if not on the same Wifi network.

Steps to reproduce the problem

I am using a public stun server.

new RTCPeerConnection({
      iceServers:
      [
        {
          url: "stun:stun3.l.google.com:19302"
        }
      ]
    });

Platform information

• React Native version: 0.63.2
• Plugin version: 1.87.1
• OS: iOS
• OS version: 14

[saghul]

You may need to specify a TURN server.

[saghul]

That SDP is correct, that’s how WebRTC does it since all transport information is in the ICE candidates. STUN alone won’t help you work in all networking scenarios, you need a TURN server.