This isn't FULLY functional, but it's what I've made thus far... I'm still working on a Ice Disconnect somewhere at least for me - welcome to test.

RelayShared/Rtc/RtcModels.cs

@@ -1,4 +1,6 @@
-using SurrealDb.Net.Models;
+using System.Text.Json.Serialization;
+using RelayShared.Rtc;
+using SurrealDb.Net.Models;
 
 #region Resharper Stuff
 // ReSharper disable ClassNeverInstantiated.Global
@@ -26,13 +28,31 @@ public enum SignalType
 
 public sealed class RtcSignalMessage
 {
+    [JsonPropertyName("type")]
     public SignalType Type { get; set; }
+
+    [JsonPropertyName("from")]
     public string From { get; set; } = string.Empty;
+
+    [JsonPropertyName("to")]
+    public string To { get; set; } = string.Empty;
+
+    [JsonPropertyName("channelId")]
     public string ChannelId { get; set; } = string.Empty;
+
+    [JsonPropertyName("sdp")]
     public string? Sdp { get; set; }
+
+    [JsonPropertyName("candidate")]
     public string? Candidate { get; set; }
+
+    [JsonPropertyName("sdpMid")]
     public string? SdpMid { get; set; }
+
+    [JsonPropertyName("sdpMLineIndex")]
     public int? SdpMLineIndex { get; set; }
+    
+    [JsonPropertyName("isInitiator")]
     public bool IsInitiator { get; set; }
 }