diff --git a/essentials-framework/Essentials Core/PepperDashEssentialsBase/DeviceTypeInterfaces/Codec/IHasExternalSourceSwitching.cs b/essentials-framework/Essentials Core/PepperDashEssentialsBase/DeviceTypeInterfaces/Codec/IHasExternalSourceSwitching.cs
new file mode 100644
index 00000000..1ea6b09b
--- /dev/null
+++ b/essentials-framework/Essentials Core/PepperDashEssentialsBase/DeviceTypeInterfaces/Codec/IHasExternalSourceSwitching.cs	
@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+using PepperDash.Essentials.Core;
+using PepperDash.Essentials.Devices.Common.VideoCodec.Cisco;
+
+namespace PepperDash.Essentials.Devices.Common.Codec
+{
+	public interface IHasExternalSourceSwitching
+	{
+		bool ExternalSourceListEnabled { get; }
+        string ExternalSourceInputPort { get; }
+		void AddExternalSource(string connectorId, string key, string name, eExternalSourceType type);
+		void SetExternalSourceState(string key, eExternalSourceMode mode);
+		void ClearExternalSources();
+        void SetSelectedSource(string key);
+		Action<string, string> RunRouteAction { set;}
+	}
+
+}
\ No newline at end of file
diff --git a/essentials-framework/Essentials Core/PepperDashEssentialsBase/PepperDash_Essentials_Core.csproj b/essentials-framework/Essentials Core/PepperDashEssentialsBase/PepperDash_Essentials_Core.csproj
index cc7a7751..6e53a98d 100644
--- a/essentials-framework/Essentials Core/PepperDashEssentialsBase/PepperDash_Essentials_Core.csproj	
+++ b/essentials-framework/Essentials Core/PepperDashEssentialsBase/PepperDash_Essentials_Core.csproj	
@@ -202,6 +202,7 @@
     <Compile Include="Devices\Base Classes\ReconfigurableDevice.cs" />
     <Compile Include="Devices\Base Classes\VideoCodecBase.cs" />
     <Compile Include="Devices\VolumeDeviceChangeEventArgs.cs" />
+    <Compile Include="DeviceTypeInterfaces\Codec\IHasExternalSourceSwitching.cs" />
     <Compile Include="DeviceTypeInterfaces\Codec\IHasParticipants.cs" />
     <Compile Include="DeviceTypeInterfaces\Codec\IHasSelfviewPosition.cs" />
     <Compile Include="DeviceTypeInterfaces\LanguageLabel.cs" />