Modem problem No Dialtone in terminal screen

It’s my first submission to this newsgroup so I don’t know if this subject
has been already covered.

I just install QNX RTP 6.1.0 everything works fine including vga, Ethernet,
cdrom etc. But there is a problem with the modem I have a Diamond Supra
Express 56 external. I create a new connection I insert the number to be
dialled etc. and when I press connect it opens port and I hear the dial tone
instead of dialling it stops and hangs up. When I click the terminal screen
I get No Dial tone how what can I set my modem so it doesn’t have to wait
for dial tone.