diff --git a/dist/api/send_message.php b/dist/api/send_message.php
index 292e858..5582ce3 100644
--- a/dist/api/send_message.php
+++ b/dist/api/send_message.php
@@ -7,7 +7,7 @@ header('Cache-Control: no-store');
 require __DIR__ . '/im_web_bootstrap.php';
 
 const WEB_MEDIA_ROOT = '/opt/im-server/media';
-const WEB_MEDIA_PUBLIC_PORT = 18000;
+define('WEB_MEDIA_PUBLIC_PORT', (int)webImEnv('JC_WEB_IM_MEDIA_PORT', '80'));
 const WEB_MEDIA_TYPE_IMAGE = 1;
 const WEB_MEDIA_TYPE_FILE = 4;
 const WEB_IMAGE_MAX_BYTES = 10 * 1024 * 1024;
@@ -154,8 +154,12 @@ function mediaPublicBaseUrl(): string
     $isHttps = (string)($_SERVER['HTTPS'] ?? '') !== '' && strtolower((string)$_SERVER['HTTPS']) !== 'off';
     $scheme = $isHttps ? 'https' : 'http';
     $host = trim(preg_replace('/:\d+$/', '', (string)($_SERVER['HTTP_HOST'] ?? $_SERVER['SERVER_NAME'] ?? '127.0.0.1')) ?: '127.0.0.1');
+    $port = (int)WEB_MEDIA_PUBLIC_PORT;
+    if ($port <= 0 || ($scheme === 'http' && $port === 80) || ($scheme === 'https' && $port === 443)) {
+        return $scheme . '://' . $host;
+    }
 
-    return $scheme . '://' . $host . ':' . WEB_MEDIA_PUBLIC_PORT;
+    return $scheme . '://' . $host . ':' . $port;
 }
 
 function saveMessageAttachmentFile(array $file, string $attachmentType): array
diff --git a/public/api/send_message.php b/public/api/send_message.php
index 292e858..5582ce3 100644
--- a/public/api/send_message.php
+++ b/public/api/send_message.php
@@ -7,7 +7,7 @@ header('Cache-Control: no-store');
 require __DIR__ . '/im_web_bootstrap.php';
 
 const WEB_MEDIA_ROOT = '/opt/im-server/media';
-const WEB_MEDIA_PUBLIC_PORT = 18000;
+define('WEB_MEDIA_PUBLIC_PORT', (int)webImEnv('JC_WEB_IM_MEDIA_PORT', '80'));
 const WEB_MEDIA_TYPE_IMAGE = 1;
 const WEB_MEDIA_TYPE_FILE = 4;
 const WEB_IMAGE_MAX_BYTES = 10 * 1024 * 1024;
@@ -154,8 +154,12 @@ function mediaPublicBaseUrl(): string
     $isHttps = (string)($_SERVER['HTTPS'] ?? '') !== '' && strtolower((string)$_SERVER['HTTPS']) !== 'off';
     $scheme = $isHttps ? 'https' : 'http';
     $host = trim(preg_replace('/:\d+$/', '', (string)($_SERVER['HTTP_HOST'] ?? $_SERVER['SERVER_NAME'] ?? '127.0.0.1')) ?: '127.0.0.1');
+    $port = (int)WEB_MEDIA_PUBLIC_PORT;
+    if ($port <= 0 || ($scheme === 'http' && $port === 80) || ($scheme === 'https' && $port === 443)) {
+        return $scheme . '://' . $host;
+    }
 
-    return $scheme . '://' . $host . ':' . WEB_MEDIA_PUBLIC_PORT;
+    return $scheme . '://' . $host . ':' . $port;
 }
 
 function saveMessageAttachmentFile(array $file, string $attachmentType): array