FATAL ERROR during call setup

Hello,

We installed VOCAL and when running sipset, it's ringing properly. But at
the reciever side, after accepting the call, we are getting "fatal error"
popup message. From the error log, it is seen that it can be a problem with
the sound card that we have. It says that, it requires full duplex sound
card. Is there any way to make our sound card full duplex ??? 

Below are the kind of messages that we get,

1. This card doesnot support full duplex.
2. We will try to proceed anyway
3. Variable to set audio output to mono ,may cause problems later .set to 2
channels 
4. Failed to set sample rate : Numerical result out of range.


Thanks,
Arindam.
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