Seems to be possible using chestnut dialer.
The problem is that the configuration is not so newbie friendly
Here is what you do
if you have already created accounts, you'll need to delete them now
- Fire up your chestnut-dialer
- click on config
- click on "Default Account"
- click the "Modem Commands" tab
you should see in that list a field that says "DIAL" and a textbox to the right of it
in that textbox, you'll see "ATDT"Change that value to "ATDP"
Now you can create your account and try to dial again