how can i establish a ras or just a simple connection with an isdn ta (v120, v110) and an analog modem to a provider, in visual basic 5?
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Well, you can launch the Dialup connection by running the command "Rundll Rnaui.dll,RnaDial <Dialup name>" in a shell... for example:

id=shell("Rundll Rnaui.dll,RnaDial Erol's Internet")

MASSheepAuthor Commented:
it's correct what you told me but it's not i want to know.
maybe i was not exact enough.
imagin the following thing:

i want to establish a connection via a modem. to do so i have to open the comport and send at-commands (eg 'atdt 0041 0900 900 941'), handshake, usr, pwd and so on...
and the other side of course has to reply. and the same thing with isdn (icluding protocol).

i hope you can help me.


For that, you need to use the MSCOMM control.  To add it to your project, right-click the Toolbox and select "Components..." then select "Microsoft Comm Control" (MSCOMM32.OCX) from the list.

There is a pretty good help page for the control.

Here is an example of how to use the control:

' Buffer to hold input string
      Dim Instring As String
      ' Use COM1.
      MSComm1.CommPort = 1
      ' 9600 baud, no parity, 8 data, and 1 stop bit.
      MSComm1.Settings = "9600,N,8,1"
      ' Tell the control to read entire buffer when Input
      ' is used.
      MSComm1.InputLen = 0
      ' Open the port.
      MSComm1.PortOpen = True
      ' Send the attention command to the modem.
      MSComm1.Output = "AT" + Chr$(13)
      ' Wait for data to come back to the serial port.

      Loop Until MSComm1.InBufferCount >= 2
      ' Read the "OK" response data in the serial port.
      Instring = MSComm1.Input
      ' Close the serial port.
      MSComm1.PortOpen = False

To Dial a phone number, once the port is open, you can send something like this:

MSComm1.Output = "ATDT 5551212" & vbCrLf

Hope this helps!


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Thanks for the points! Glad I could help!

MASSheepAuthor Commented:
this was my first question... and i don't know how much points are ok for such a question...
The EE guidelines for assigning points are:

50 - easy question
100 - medium question
200+ -hard question

This was a medium to hard question...

MASSheepAuthor Commented:
then i should have give you 5 points :-)
thank you for that.
i have got 600 experts points already!!
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