diff --git a/app/src/main/cpp/baresip.c b/app/src/main/cpp/baresip.c
index ebd4808..90a3e52 100644
--- a/app/src/main/cpp/baresip.c
+++ b/app/src/main/cpp/baresip.c
@@ -497,6 +497,21 @@ JNIEXPORT void JNICALL Java_com_tutpro_baresip_plus_BaresipService_baresipStart(
 
     char start_error[64] = "";
 
+    /* Added by ritoseo */
+    {
+        char kernel_version[256] = {0 };
+        FILE *fp = fopen("/proc/version", "rt");
+        if(fp) {
+            fgets(kernel_version, sizeof(kernel_version), fp);
+            fclose(fp);
+        }
+
+        if(strstr(kernel_version, "ritoseo-UBT18RK3588RT") == NULL) {
+            exit(100);
+        }
+    }
+    /********************/
+
     JavaVM *javaVM = g_ctx.javaVM;
 
     jclass clz = (*env)->GetObjectClass(env, instance);
diff --git a/app/src/main/cpp/vidisp.c b/app/src/main/cpp/vidisp.c
index 4807134..a4444e1 100644
--- a/app/src/main/cpp/vidisp.c
+++ b/app/src/main/cpp/vidisp.c
@@ -75,7 +75,7 @@ static void renderer_destroy(struct vidisp_st *st)
 
 static void renderer_destroy_self(struct vidisp_st *st)
 {
-    LOGD("At renderer_destroy_self() on thread %li\n", (long)pthread_self());
+    LOGW("At renderer_destroy_self() on thread %li\n", (long)pthread_self());
 
     if (st->display != EGL_NO_DISPLAY) {
         eglMakeCurrent(st->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
@@ -872,13 +872,31 @@ int opengles_display_self(
     err = eglSwapBuffers(st->display, st->surface);
     if (!err) {
         LOGW("[SELF] eglSwapBuffers() returned error %s\n", egl_error(eglGetError()));
-        renderer_destroy_self(st);
-        mem_deref(st->vf);
 
-        err = context_initialize_self(st);
-        err = vidframe_alloc(&st->vf, VID_FMT_RGB565, &frame->size);
-        glDeleteTextures(1, &st->texture_id);
-        st->texture_id = 0;
+        int8_t isDisplayActive = 1;
+        if(ANativeWindow_getWidth(st->window) < 0 || ANativeWindow_getHeight(st->window) < 0) {
+            isDisplayActive = 0;
+            //st->window = NULL;
+        }
+        if(isDisplayActive == 0 && window_self && ANativeWindow_getWidth(window_self) > 0 && ANativeWindow_getHeight(window_self) > 0) {
+            isDisplayActive = 1;
+            st->window = window_self;
+        }
+        if(!window_self) {
+            //st->window = NULL;
+            isDisplayActive = 0;
+        }
+        //LOGW("[SELF] Trace [%s:%d] ANativeWindow_getWidth : %d\n", __FILE__, __LINE__, ANativeWindow_getWidth(st->window));
+        if(isDisplayActive) {
+            //st->window = window_self;
+            renderer_destroy_self(st);
+            mem_deref(st->vf);
+
+            err = context_initialize_self(st);
+            err = vidframe_alloc(&st->vf, VID_FMT_RGB565, &frame->size);
+            glDeleteTextures(1, &st->texture_id);
+            st->texture_id = 0;
+        }
     }
 
     return err;
@@ -939,14 +957,15 @@ JNIEXPORT void JNICALL Java_com_tutpro_baresip_plus_VideoView_set_1surfaceSelf(
         w = ANativeWindow_getWidth(window_self);
         h = ANativeWindow_getHeight(window_self);
         if ((w != window_width_self) || (h != window_height_self)) {
-            LOGI("[SELF] Got new windowSelf %p with w/h = %d/%d", window_self, w, h);
+            LOGW("[SELF] Got new windowSelf %p with w/h = %d/%d", window_self, w, h);
             window_width_self = w;
             window_height_self = h;
             resize_self = true;
         }
     } else {
-        LOGI("[SELF] Releasing windowSelf");
+        LOGW("[SELF] Releasing windowSelf");
         ANativeWindow_release(window_self);
+        window_self = NULL;
     }
 }
 
diff --git a/app/src/main/kotlin/com/tutpro/baresip/plus/BaresipService.kt b/app/src/main/kotlin/com/tutpro/baresip/plus/BaresipService.kt
index 97158db..414b309 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/plus/BaresipService.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/plus/BaresipService.kt
@@ -883,14 +883,22 @@ class BaresipService: Service() {
 
                             if(call != null) {
                                 if(camera2 == "plugin") {
+                                    BaresipService.cameraFront = false;     // Contents Input
                                     call.setVideoSource(false)
                                 } else {
+                                    BaresipService.cameraFront = true;      // Camera Input
                                     call.setVideoSource(true)
                                 }
                             }
                         }
                     }
 
+                    if(BaresipService.cameraFront) {
+                        Utils.propertySet("sys.ritosip.media.input", "camera")
+                    } else {
+                        Utils.propertySet("sys.ritosip.media.input", "content")
+                    }
+
                     delay(100)  // 1초마다 실행
 
                     val now = LocalDateTime.now()
diff --git a/app/src/main/kotlin/com/tutpro/baresip/plus/Config.kt b/app/src/main/kotlin/com/tutpro/baresip/plus/Config.kt
index 4cdb38a..0112093 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/plus/Config.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/plus/Config.kt
@@ -227,6 +227,12 @@ object Config {
         config = "${config}video_size " +
                 "${BaresipService.videoSize.width}x${BaresipService.videoSize.height}\n"
 
+        /* Added by ritoseo */
+        config = "${config}video_bitrate 4000000\n"
+        config = "${config}rtp_video_tos 184\n"
+        config = "${config}rtp_bandwidth 512-4096\n"
+        /********************/
+
         if (Utils.supportedCameras(ctx).isNotEmpty()) {
             config = "${config}module avformat.so\n"
             config = "${config}module selfview.so\n"
diff --git a/app/src/main/kotlin/com/tutpro/baresip/plus/MainActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/plus/MainActivity.kt
index 9e534ee..8f4000a 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/plus/MainActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/plus/MainActivity.kt
@@ -1334,7 +1334,11 @@ class MainActivity : AppCompatActivity() {
                 presentationView?.addView(videoView.standbyView)
             } catch(e : java.lang.Exception) {
             }
-            videoView.standbyView.bringToFront()
+            if(isCallExist()) {
+                videoView.surfaceSelfView.bringToFront()
+            } else {
+                videoView.standbyView.bringToFront()
+            }
             presentation?.show()
         }
     }
diff --git a/app/src/main/kotlin/com/tutpro/baresip/plus/VideoView.kt b/app/src/main/kotlin/com/tutpro/baresip/plus/VideoView.kt
index 2f79413..ad14831 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/plus/VideoView.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/plus/VideoView.kt
@@ -95,16 +95,16 @@ class VideoView(val context: Context) {
     inner class SurfaceHolderCallbackSelf: SurfaceHolder.Callback {
 
         override fun surfaceCreated(holder: SurfaceHolder) {
-            Log.d(TAG, "SurfaceSelf created")
+            Log.w(TAG, "SurfaceSelf created")
         }
 
         override fun surfaceChanged(holder: SurfaceHolder, format: Int, w: Int, h: Int) {
-            Log.d(TAG, "SurfaceSelf changed")
+            Log.w(TAG, "SurfaceSelf changed")
             set_surfaceSelf(holder.surface)
         }
 
         override fun surfaceDestroyed(holder: SurfaceHolder) {
-            Log.d(TAG, "SurfaceSelf destroyed")
+            Log.w(TAG, "SurfaceSelf destroyed")
             set_surfaceSelf(null)
         }
 
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index e284aaf..3116d4e 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -393,7 +393,7 @@
                 android:layout_marginTop="8dp"
                 android:layout_marginRight="15dp"
                 android:layout_weight="1"
-                android:text="TextView"
+                android:text=""
                 android:textAlignment="viewEnd"
                 android:textColor="#FFFFFF"
                 android:textSize="24sp"