I need a solution which can dial the same number several times at a pre- determined times. On connection it plays a short DTMF code and then automatically hangs up. Can your software do this?

Voicent software can do mostly what you ask for with no programming effort from you. With some programming effor from you, it can do exactly what you ask for. Let me explian a little more in detail:

With current avaliable Autoreminder or Broadcastbyphone, you can set pre-determined time
and number of calls you want to make. It can play voice messages (not DTMF tone) and automatically hang up as many times as you specify.

With current available Voicent Gateway library, you can write a simple program based on Gateway
to play DTMF tone instead of voice messages. You can take a look at the http://www.voicent.com/devnet page. It has detailed infomation on integration and feature development tutorial using Voicent Gateway library.