VoIP Java application

[Hussein Baghdadi]

Hi.
Consider the typical chat application (a panel which lists all active users , text field to type into, a panel which displays all posts).
This applicatin is implemented as a Swing application.
Now this chat application should support VoIP according to :
When a user talks (using the microphone),all the active users should hear what he says.
My questions are :
1. How to collect the voice input from the user ? (using Java Communication API)
2. What to do with the uploaded voice (save it for example) ?
3. When the voice is transmitted to users, how to play it ?
4. Any open source libraries that I can make use of them ?

[Joe Ess]

The Java Communication API is for working with serial and parallel ports. The Java Media Framework is the API for working with media devices and is likely your starting point.

[Arun Prasath]

For call initiation, and call handling, SIP(Session Initiation Protocol) is used. Java implementation of this protocol is available as Jain-Sip API.

[Deepak Bala]

I would also suggest you look into the SIP protocol. I have not done this yet but did some high level research on it a few months back.