diff --git a/modules/cache/cache.go b/modules/cache/cache.go
index 3ed7ffb..777c763 100644
--- a/modules/cache/cache.go
+++ b/modules/cache/cache.go
@@ -4,3 +4,15 @@ import "krakatoa.net/backend/modules/structs"
 
 var WebClients = make(map[string]*structs.WebClient)
 var MinecraftClients = make(map[string]*structs.MinecraftClient)
+
+var WebVoiceMessagesSendQueue = make(map[int]*structs.WebClientSendQueueMessage)
+var WebMobileMessagesSendQueue = make(map[int]*structs.WebClientSendQueueMessage)
+
+func IsInWebMessagesSendQueue(queue map[int]*structs.WebClientSendQueueMessage, cmdID int) bool {
+	for CmdID, _ := range queue {
+		if CmdID == cmdID {
+			return true
+		}
+	}
+	return false
+}
diff --git a/modules/structs/WebClient.go b/modules/structs/WebClient.go
index a375871..93ac240 100644
--- a/modules/structs/WebClient.go
+++ b/modules/structs/WebClient.go
@@ -3,6 +3,7 @@ package structs
 import (
 	"errors"
 	"sync"
+	"time"
 
 	"github.com/gofiber/websocket/v2"
 	"krakatoa.net/backend/modules/logger"
@@ -38,6 +39,13 @@ type WebClient struct {
 	CurrentVoiceCmdIDIndexByBackend       int
 }
 
+type WebClientSendQueueMessage struct {
+	MessageRaw   []byte
+	CmdID        int
+	TrySendCount int
+	Time         time.Time
+}
+
 func (webClient *WebClient) SendBinaryMessage(conn *websocket.Conn, msg []byte) error {
 	if conn == webClient.MobileConn {
 		webClient.mobileConnMu.Lock()
diff --git a/serverCommunication/serverCommunication.go b/serverCommunication/serverCommunication.go
index a0bcafc..bd600ae 100644
--- a/serverCommunication/serverCommunication.go
+++ b/serverCommunication/serverCommunication.go
@@ -1,5 +1,13 @@
 package serverCommunication
 
+import (
+	"fmt"
+	"time"
+
+	"krakatoa.net/backend/modules/cache"
+	"krakatoa.net/backend/modules/logger"
+)
+
 /*
 func getClientByDest(dest int, uuid string) (*structs.WebClient, *structs.MinecraftClient) {
 	switch dest {
@@ -17,3 +25,15 @@ func getClientByDest(dest int, uuid string) (*structs.WebClient, *structs.Minecr
 	}
 }
 */
+
+func AckHandler() {
+	ticker := time.NewTicker(20 * time.Millisecond)
+
+	for _ = range ticker.C {
+		fmt.Println("")
+
+		for cmdID, object := range cache.WebVoiceMessagesSendQueue {
+			logger.Web.Println("ackHandler", cmdID, object)
+		}
+	}
+}
diff --git a/serverCommunication/web.go b/serverCommunication/web.go
index b70cc71..8419d8e 100644
--- a/serverCommunication/web.go
+++ b/serverCommunication/web.go
@@ -54,6 +54,14 @@ func HandleWebMessage(isVoice bool, conn *websocket.Conn, uuid string, msg []byt
 					return
 				}
 			}
+
+			if isCmdIDInList(webClient.VoiceCmdIDs, cmdID) {
+				webClient.RemoveVoiceCmdID(cmdID)
+			}
+
+			if cache.IsInWebMessagesSendQueue(cache.WebVoiceMessagesSendQueue, cmdID) {
+				delete(cache.WebVoiceMessagesSendQueue, cmdID)
+			}
 		} else {
 			for _, data := range webClient.MobileCmdIDsByBackend {
 				if data.WebCmdID == cmdID { // forward to target dest
@@ -76,12 +84,10 @@ func HandleWebMessage(isVoice bool, conn *websocket.Conn, uuid string, msg []byt
 					return
 				}
 			}
-		}
 
-		if isVoice && isCmdIDInList(webClient.VoiceCmdIDs, cmdID) {
-			webClient.RemoveVoiceCmdID(cmdID)
-		} else if isCmdIDInList(webClient.MobileCmdIDs, cmdID) {
-			webClient.RemoveMobileCmdID(cmdID)
+			if isCmdIDInList(webClient.MobileCmdIDs, cmdID) {
+				webClient.RemoveMobileCmdID(cmdID)
+			}
 		}
 		return
 	}
@@ -119,7 +125,6 @@ func HandleWebMessage(isVoice bool, conn *websocket.Conn, uuid string, msg []byt
 			webClient.MobileCmdIDs = append(webClient.MobileCmdIDs, cmdID)
 			logger.Web.Debugln("after MobileCmdIDs", webClient.MobileCmdIDs)
 		}
-		return
 	}
 
 	// no ack
@@ -143,6 +148,10 @@ func HandleWebMessage(isVoice bool, conn *websocket.Conn, uuid string, msg []byt
 					if err != nil {
 						logger.WebVoice.Warnln("write:", err)
 					}
+
+					if status == kraProtocol.StatusGet {
+						cache.WebVoiceMessagesSendQueue[cmdID] = &structs.WebClientSendQueueMessage{MessageRaw: raw, CmdID: cmdID, TrySendCount: 0, Time: time.Now()}
+					}
 				} else { // mobile not connected
 					raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusSend, 58299, cmdNumber, "")
 
@@ -176,6 +185,10 @@ func HandleWebMessage(isVoice bool, conn *websocket.Conn, uuid string, msg []byt
 					if err != nil {
 						logger.WebMobile.Warnln("write:", err)
 					}
+
+					if status == kraProtocol.StatusGet {
+						cache.WebMobileMessagesSendQueue[cmdID] = &structs.WebClientSendQueueMessage{MessageRaw: raw, CmdID: cmdID, TrySendCount: 0, Time: time.Now()}
+					}
 				} else { // voice not connected
 					raw = kraProtocol.EncodeWebMessage(kraProtocol.StatusSend, 5456, cmdNumber, "")