diff --git a/Classes/CallManager.swift b/Classes/CallManager.swift
index 6552dab3f..540cfa98a 100644
--- a/Classes/CallManager.swift
+++ b/Classes/CallManager.swift
@@ -374,6 +374,7 @@ import AVFoundation
 			providerDelegate.uuids.updateValue(uuid, forKey: callId)
 			let callInfo = CallInfo.newIncomingCallInfo(callId: callId)
 			callInfo.declined = true
+			callInfo.reason = Reason.Busy
 			providerDelegate.callInfos.updateValue(callInfo, forKey: uuid)
 		} else {
 			// end call
@@ -425,8 +426,7 @@ class CoreManagerDelegate: CoreDelegate {
 						CallManager.instance().providerDelegate.updateCall(uuid: uuid!, handle: address, hasVideo: video)
 						let callInfo = CallManager.instance().providerDelegate.callInfos[uuid!]
 						if (callInfo?.declined ?? false) {
-							// The call is already declined.
-							try? call.decline(reason: Reason.Unknown)
+							DispatchQueue.main.asyncAfter(deadline: .now()) {try? call.decline(reason: callInfo!.reason)}
 						} else if (callInfo?.accepted ?? false) {
 							// The call is already answered.
 							CallManager.instance().acceptCall(call: call, hasVideo: video)
diff --git a/Classes/ProviderDelegate.swift b/Classes/ProviderDelegate.swift
index 0d75f13c4..a3b40216d 100644
--- a/Classes/ProviderDelegate.swift
+++ b/Classes/ProviderDelegate.swift
@@ -32,8 +32,8 @@ import os
 	var sasEnabled = false
 	var declined = false
 	var connected = false
-	
-	
+	var reason: Reason = Reason.None
+
 	static func newIncomingCallInfo(callId: String) -> CallInfo {
 		let callInfo = CallInfo()
 		callInfo.callId = callId
@@ -92,17 +92,18 @@ class ProviderDelegate: NSObject {
 				CallManager.instance().providerDelegate.endCallNotExist(uuid: uuid, timeout: .now() + 20)
 			} else {
 				Log.directLog(BCTBX_LOG_ERROR, text: "CallKit: cannot complete incoming call with call-id: [\(String(describing: callId))] and UUID: [\(uuid.description)] from [\(handle)] caused by [\(error!.localizedDescription)]")
-				if (call == nil) {
-					callInfo?.declined = true
-					self.callInfos.updateValue(callInfo!, forKey: uuid)
-					return
-				}
 				let code = (error as NSError?)?.code
-				if code == CXErrorCodeIncomingCallError.filteredByBlockList.rawValue || code == CXErrorCodeIncomingCallError.filteredByDoNotDisturb.rawValue {
-					try? call?.decline(reason: Reason.Busy)
-				} else {
-					try? call?.decline(reason: Reason.Unknown)
+				switch code {
+				case CXErrorCodeIncomingCallError.filteredByDoNotDisturb.rawValue:
+					callInfo?.reason = Reason.DoNotDisturb
+				case CXErrorCodeIncomingCallError.filteredByBlockList.rawValue:
+					callInfo?.reason = Reason.DoNotDisturb
+				default:
+					callInfo?.reason = Reason.Unknown
 				}
+				callInfo?.declined = true
+				self.callInfos.updateValue(callInfo!, forKey: uuid)
+				try? call?.decline(reason: callInfo!.reason)
 			}
 		}
 	}