pnwebrtc/src/main/java/me/kevingleason/pnwebrtc/PnSignalingParams.java
public void addIceServers(List<PeerConnection.IceServer> iceServers){
        if(this.iceServers!=null) {
            iceServers.addAll(this.iceServers);
        }
        this.iceServers = iceServers;
    }
public void addIceServers(List<PeerConnection.IceServer> iceServers){
        if(this.iceServers!=null) {
            iceServers.addAll(this.iceServers);
        }
        this.iceServers = iceServers;
    }
Append default servers to the end of given list and set as iceServers instance variable
@param iceServers List of iceServers