refactor: rearrange and add solution for 4-series

src/PepperDash.Essentials.Devices.Common/Codec/iHasDialer.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+using PepperDash.Essentials.Core;
+
+namespace PepperDash.Essentials.Devices.Common.Codec
+{
+    /// <summary>
+    /// Requirements for a device that has dialing capabilities
+    /// </summary>
+    public interface IHasDialer
+    {
+        // Add requirements for Dialer functionality
+
+        event EventHandler<CodecCallStatusItemChangeEventArgs> CallStatusChange;
+
+        void Dial(string number);
+        void EndCall(CodecActiveCallItem activeCall);
+        void EndAllCalls();
+        void AcceptCall(CodecActiveCallItem item);
+        void RejectCall(CodecActiveCallItem item);
+        void SendDtmf(string digit);
+
+        bool IsInCall { get; }
+    }
+
+}