You may want to take a look at Asterisk. This is basically the lego kit of
VoIP processing. Even if you don't find their application to be applicable, the support forums are pretty interesting. Asterisk works with mySQL.

http://www.asterisk.org

-- L

>Voice over IP is not just the use of a sound card and a microphone. Are you sure this is what the user is in need of?
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>>I have an application that I need to write for a telemarketing company. It needs the ability for users to dial from their computer using VOIP (voice over ip). (i.e., use the sound card and a microphone, let the software do the dialing, etc.)
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>>Has anyone done this before? Is there any type of ActiveX/COM interface to a standard SIP type service provider?
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>>Thanks in advance.
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>>Bob