Best choice for VOIP component

What is the most used (or better) VOIP component.

I need one for developing professional VOIP applications and I want suggestions for best choice...

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LRHGuyConnect With a Mentor Commented:
Check out the free components, Turbo Power's Async has FAX and VOIP! Complete with source!
I only know of Vonage so far ...
Wim ten BrinkSelf-employed developerCommented:
There's just no "best" component in general. You should just try a few and use the one you yourself like the most. Why? Because we all have our own personal feelings and the components that I like might be the ones you hate... ;-)
Besides, it also depends if you're willing to pay for components or if you're looking for just freeware. Do you want sourcecode to be included? Would you accept an ActiveX control?
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