Missed Notifications Reminder is described as 'Unfortunately Android OS doesn't have default integrated functionality to notify user periodically about missing calls/messages/other notifications via sound (only LED is blinking)'. There are three alternatives to Missed Notifications Reminder for Android, Online / Web-based and Windows. The best alternative is Gmail Notifier Pro. It's not free, so if you're looking for a free alternative, you could try Missed Call.
Gmail Notifier Pro is a Windows application capable of checking multiple Gmail accounts for new mail and display notifications. Feature highlights - Check multiple Gmail accounts, including Google Apps, for new mail. - Supports both Atom and IMAP protocols for mail.