AT commands for a voice modem

I have a Voice modem and I am communicating with it over a serial connection with AT commands. I am trying to put the modem in voice mode so that i can dial a number through Labview and play a wav file which should be heard on the receiving end. I do not know the commands to put the modem into voice mode, I have run Supervoice voice comms software and it manages to put it in voice mode but I cannot see what commands it sends it. Can anyone help? Im loosing hair over this.... =)
I know there is a AT+FCLASS=8 command, I have tried this before sending ATDT (to dial a number) but it hasnt worked.

You've probably solved this problem long ago, but I came across this thread a couple weeks ago when trying to do the same and thought I post this .vi for future users. This code is for a multitech MT5656ZDXV modem, but I think the AT commands are generic enough to be used with any voice modem. Hardware configuration requires and audio cable running from the PC speaker to the modem mic port. Also, I had to use a Konnex Office Konnector telephone line A/D which required me to manually pick up a handset; the software prompts the user to do this. Fancier A/Ds should eliminate the need for this and I have one on order. If you have an analog phone line then there should be no need to use an A/D or manually pick up the phone.
Attachments:
modem_speakerphone.vi ‏21 KB
Sound Player.vi ‏17 KB

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For the past month, I'm searching for some help on this topic without success, "you are my last hope"
After modification of the PPP parameters under network preferences (according the clear archive from apple support on this topic), the terminal windows is poping up without any problem.
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You've probably solved this problem long ago, but I came across this thread a couple weeks ago when trying to do the same and thought I post this .vi for future users. This code is for a multitech MT5656ZDXV modem, but I think the AT commands are generic enough to be used with any voice modem. Hardware configuration requires and audio cable running from the PC speaker to the modem mic port. Also, I had to use a Konnex Office Konnector telephone line A/D which required me to manually pick up a handset; the software prompts the user to do this. Fancier A/Ds should eliminate the need for this and I have one on order. If you have an analog phone line then there should be no need to use an A/D or manually pick up the phone.
Attachments:
modem_speakerphone.vi ‏21 KB
Sound Player.vi ‏17 KB

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I did find a forum related to your enquiry: http://forums.ni.com/t5/LabVIEW/AT-commands-in-labview/td-p/1213335
And I did find an example from ni.com: http://zone.ni.com/devzone/cda/epd/p/id/2577
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