I like to know how to add VOIP (pc/phone to pc/phone) calling facility to a web page. I did some reading and leant some theory about the protocols, gateways, Gate keepers etc. But I was unable to find out answers to basic questions like
1) Who are the Gatekeepers who can sell me a SIP username.
2) From where do I get the SIP username and Passwords needed to connect to a SIP gateway?
3)Do I need to have my own Gateways or can I use a third party gateway for a fee, if so where can I find one?
Thanks in advance,
Axell.

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You're making this way to complex on yourself. Many of the major VOIP companies that offer desktop VOIP clients like IM/VOIP programs, also offer a web version of their software. All you have to do is buy the license to the software so people can call you from your page using the web based program. You don't have to do much, just plug the code into your page.