asterisk users - Jun 2005 - Voice quality of Softphones vs. IP Phones and Gateways.

I've tried almost any softphone available on the market with many different
PC, soundcard, headphones combinations.
None of them prooved production reliable in a call center environment. 
I've also tested many IP Phones and Gateways. Even the cheapest one supplies
much better quality. 
Is this a fact or am I missing a point. 
I would certanly prefer a softphone because of cost and simplicity in CTI
applications.
Cenk.
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