APPS to simulate pager and beeper?

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http://androidforums.com – Hello Everyone, I am looking for an app which when receiving an SMS will act like a beeper or pager and make a repetitive sound or prolonged sound . I am a physician and I have installed a VOIP in my office which will send me both a text message and an email if the matter is urgent . However, if I happen to miss the single notification sound of an incoming message, I could miss an urgent situation. Moreover , if I am sleeping , I would like a notification sound which would wake me up . I would also like it to call back periodically until I someone how acknowledge that I got the message (General)