Catalog::normalizePhoneNumber

static function normalizePhoneNumber($phone)
{
	$phone = preg_replace('/[^d]/', '', $phone);

	$cleanPhone = NormalizePhone($phone, 6);

	if (mb_strlen($cleanPhone) == 10)
	{
		$cleanPhone = '7'.$cleanPhone;
	}

	return $cleanPhone;
}