diff --git a/application/Espo/Core/PhoneNumber/InternationalValidator.php b/application/Espo/Core/PhoneNumber/InternationalValidator.php
new file mode 100644
index 0000000000..4c1fd896d7
--- /dev/null
+++ b/application/Espo/Core/PhoneNumber/InternationalValidator.php
@@ -0,0 +1,91 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\PhoneNumber;
+
+use Brick\PhoneNumber\PhoneNumber;
+use Brick\PhoneNumber\PhoneNumberParseException;
+use Espo\Core\Utils\Metadata;
+
+/**
+ * @since 9.0.3
+ */
+class InternationalValidator
+{
+    public function __construct(
+        private Metadata $metadata,
+    ) {}
+
+    public function isValid(string $number, bool $allowExtension = false): bool
+    {
+        if ($number === '') {
+            return false;
+        }
+
+        $pattern = $this->metadata->get(['app', 'regExpPatterns', 'phoneNumberLoose', 'pattern']);
+
+        if (!$pattern) {
+            return true;
+        }
+
+        $preparedPattern = '/^' . $pattern . '$/';
+
+        if (!preg_match($preparedPattern, $number)) {
+            return false;
+        }
+
+        $ext = null;
+
+        if ($allowExtension) {
+            [$number, $ext] = Util::splitExtension($number);
+        }
+
+        if ($ext) {
+            if (!preg_match('/[0-9]+/', $ext)) {
+                return false;
+            }
+
+            if (strlen($ext) > 6) {
+                return false;
+            }
+        }
+
+        try {
+            $numberObj = PhoneNumber::parse($number);
+        } catch (PhoneNumberParseException) {
+            return false;
+        }
+
+        if ((string) $numberObj !== $number) {
+            return false;
+        }
+
+        return $numberObj->isPossibleNumber();
+    }
+}