I wish to dial telephone numbers from an Excel VBA macro using my PC's
modem. A Google search came up with:
http://www.ozgrid.com/forum/showthread.php?t=16781
and
http://www.mrexcel.com/forum/showthread.php?t=70207
amongst others. Essentially they declare a function to access tapi32.dll:

Declare Function tapiRequestMakeCall Lib "TAPI32.DLL" (ByVal lpszDestAddress
As String, ByVal lpszAppName As String, ByVal lpszCalledParty As String,
ByVal lpszComment As String) As Long

And then use the function:

x = tapiRequestMakeCall(cPhone, "", cName, "")

where cPhone is a string containing the required number. e.g. "0123456789"

This works as expected. The Phone Dialer application pops up two windows at
the top left of the screen, once labelled "Preview" and the other "Phone
Call". However, I actually want to dial 'numbers' including the * and #
characters, for example, to cancel ringback on the BT network by dialling
"#37#" etc. If I enter a non-numeric number the second window has the title
"Internet Call" and the call fails with the message "Failed: wrong number or
the called device is out of service".

I can dial such numbers manually using Phone Dialer where I am able to
select whether I wish to dial as a Phone Call or as an Internet Call.

How can I dial # and * on the modem using TAPI32?