diff --git a/internal/core/transcode/code.go b/internal/core/transcode/code.go
index a029e39..2be9c03 100644
--- a/internal/core/transcode/code.go
+++ b/internal/core/transcode/code.go
@@ -1,6 +1,7 @@
 package transcode
 
 import (
+	"encoding/binary"
 	"fmt"
 	"github.com/gorilla/websocket"
 	"log/slog"
@@ -19,7 +20,7 @@ func (tk *Task) StartTalkCode(wsURL string, transport string) error {
 	frameSize := 160
 	dir, _ := os.Getwd()
 	inputFile := filepath.Join(dir, tk.EncodeUrl)
-	//SSRC := tk.GetSSRCUint32()
+	SSRC := tk.GetSSRCUint32()
 	if _, err := os.Stat(inputFile); os.IsNotExist(err) {
 		return fmt.Errorf("input file does not exist: %v", err.Error())
 	}
@@ -50,7 +51,6 @@ func (tk *Task) StartTalkCode(wsURL string, transport string) error {
 	// Calculate frame duration in milliseconds
 	frameDuration := time.Duration(float64(frameSize)/float64(sampleRate)*1000) * time.Millisecond
 	nextSendTime := time.Now()
-
 	frame := make([]byte, frameSize)
 	var errors error
 	for {
@@ -76,7 +76,7 @@ func (tk *Task) StartTalkCode(wsURL string, transport string) error {
 				PayloadType:    8, // G711 A-law
 				SequenceNumber: seqNumber,
 				Timestamp:      currentTimestamp,
-				SSRC:           123456,
+				SSRC:           SSRC,
 			},
 			Payload: frame[:n],
 		}
@@ -88,27 +88,30 @@ func (tk *Task) StartTalkCode(wsURL string, transport string) error {
 			continue
 		}
 		if transport == "tcp" {
-			tcpBuf := make([]byte, 4)
-			tcpBuf[0] = byte(len(data) >> 24)
-			tcpBuf[1] = byte(len(data) >> 16)
-			tcpBuf[2] = byte(len(data) >> 8)
-			tcpBuf[3] = byte(len(data))
+			// Create TCP encapsulation: 4-byte length header + RTP packet data
+			//tcpData := make([]byte, 4+len(data))
+			//binary.BigEndian.PutUint32(tcpData[:4], uint32(len(data))) // 4-byte length header
+			//copy(tcpData[4:], data)                                    // RTP packet data
 
-			err = c.WriteMessage(websocket.BinaryMessage, tcpBuf)
+			rfc4571Data := make([]byte, 2+len(data))
+			binary.BigEndian.PutUint16(rfc4571Data[:2], uint16(len(data))) // 2-byte length header (RFC 4571)
+			copy(rfc4571Data[2:], data)
+
+			err = c.WriteMessage(websocket.BinaryMessage, rfc4571Data)
 			if err != nil {
-				errors = fmt.Errorf("error sending RTP packet via WebSocket: %v", err.Error())
-				slog.Debug("Error sending RTP packet via WebSocket", "err", err.Error())
+				slog.Debug("Error sending RTP TCP packet via WebSocket", "err", err.Error())
 				break
 			}
+
 		} else {
 			err = c.WriteMessage(websocket.BinaryMessage, data)
 			if err != nil {
 				errors = fmt.Errorf("error sending RTP packet via WebSocket: %v", err.Error())
-				slog.Debug("Error sending RTP packet via WebSocket", "err", err.Error())
+				slog.Debug("Error sending RTP UDP packet via WebSocket", "err", err.Error())
 				break
 			}
 		}
-
+		slog.Debug("sending RTP TCP packet via WebSocket OK")
 		// Increment sequence number
 		seqNumber++
 
diff --git a/web/src/pages/Home.tsx b/web/src/pages/Home.tsx
index 66bb58a..9d42263 100644
--- a/web/src/pages/Home.tsx
+++ b/web/src/pages/Home.tsx
@@ -31,7 +31,7 @@ export default function Home() {
 
   return (
     <Row gutter={16}>
-      <div>
+      <Col sm={24} md={24} lg={3} xl={3} xxl={3} className="w-full">
         <Affix className="hidden lg:block" offsetTop={0}>
           <Box
             style={{ minWidth: "10rem", width: "12rem" }}
@@ -58,8 +58,8 @@ export default function Home() {
             items={items}
           />
         </Box>
-      </div>
-      <Col sm={24} md={24} lg={18} xl={18} xxl={18} className="w-full">
+      </Col>
+      <Col sm={24} md={24} lg={21} xl={21} xxl={21} className="w-full">
         {/* <Col sm={24} md={24}  className="w-full"> */}
         {currentMenu == "sub0" && (
           <Box>