Internet Calls Dropping Out
If you are experiencing problems with the calls to your Internet Service Provider dropping out, it more than likely is due to "call waiting" being enabled on your phone line. Tones are sent down your phone line over the data, which your modem or ISP's modem treat as a disconnect signal.
The solution is to program in front of your ISP's phone number in your modem setup *44. This then stops the sending of additional tones to your modem while your PC is connected to your ISP.
This is explained in the front of your phone book in how to use Telstra Phone services.
Hope this helps.
regards
Kev M