diff --git a/channels/rdpsnd/server/rdpsnd_main.c b/channels/rdpsnd/server/rdpsnd_main.c
index 9c09afc89..0af4179e6 100644
--- a/channels/rdpsnd/server/rdpsnd_main.c
+++ b/channels/rdpsnd/server/rdpsnd_main.c
@@ -83,8 +83,8 @@ static BOOL rdpsnd_server_send_formats(RdpsndServerContext* context, wStream* s)
 
 static BOOL rdpsnd_server_recv_waveconfirm(RdpsndServerContext* context, wStream* s)
 {
-	UINT16 timestamp = 0;
-	BYTE confirmBlockNum = 0;
+	UINT16 timestamp;
+	BYTE confirmBlockNum;
 
 	if (Stream_GetRemainingLength(s) < 4)
 		return FALSE;
@@ -92,6 +92,9 @@ static BOOL rdpsnd_server_recv_waveconfirm(RdpsndServerContext* context, wStream
 	Stream_Read_UINT16(s, timestamp);
 	Stream_Read_UINT8(s, confirmBlockNum);
 	Stream_Seek_UINT8(s);
+
+	IFCALL(context->ConfirmBlock, context, confirmBlockNum, timestamp);
+
 	return TRUE;
 }
 
diff --git a/include/freerdp/server/rdpsnd.h b/include/freerdp/server/rdpsnd.h
index e83fd231d..1dca00a11 100644
--- a/include/freerdp/server/rdpsnd.h
+++ b/include/freerdp/server/rdpsnd.h
@@ -33,6 +33,7 @@ typedef int (*psRdpsndStop)(RdpsndServerContext* context);
 typedef BOOL (*psRdpsndServerInitialize)(RdpsndServerContext* context);
 typedef BOOL (*psRdpsndServerSelectFormat)(RdpsndServerContext* context, int client_format_index);
 typedef BOOL (*psRdpsndServerSendSamples)(RdpsndServerContext* context, const void* buf, int nframes);
+typedef BOOL (*psRdpsndServerConfirmBlock)(RdpsndServerContext* context, BYTE confirmBlockNum, UINT16 wtimestamp);
 typedef BOOL (*psRdpsndServerSetVolume)(RdpsndServerContext* context, int left, int right);
 typedef BOOL (*psRdpsndServerClose)(RdpsndServerContext* context);
 
@@ -82,6 +83,10 @@ struct _rdpsnd_server_context
 	 * nframes * src_format.nBitsPerSample * src_format.nChannels / 8
 	 */
 	psRdpsndServerSendSamples SendSamples;
+	/**
+	 * Called when block confirm is received from the client
+	 */
+	psRdpsndServerConfirmBlock ConfirmBlock;
 	/**
 	 * Set the volume level of the client. Valid range is between 0 and 0xFFFF.
 	 */