How to use DAQ as a soundcard under linux

Hi,
My goal is to use a pci-4461 as a high accuracy replacement for a soundcard in a linux environment. The programming language should be C.
I have already looked at the examples that come with the linux driver but my problem is how to exchange the audio data with other applications in real time.
My other application is a softphone for IP-telephony that normally uses the /dev/dsp device under linux to exchange sound with the soundcard. (This can be changed to another device from within the softphone). Now, I want the softphone to read from and write to the DAQ instead of the soundcard. So the DAQ should be configured for continous analog input and output and give the data to the softphone in real time.
Do you have any ideas how to do that with the nidaq-C-functions?
Thank you for your help
Fabian

This example might help:
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=EE91CE2098BB42C1E0340003BA230ECF&p_...

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New Microsoft Word Document (2).docx ‏32 KB

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