For example, Flash records voice and sends it to the server where Java or C# apps can proccess it and return back some data (or write it to db).
How this communication possible, which protocols sould be used and etc.
For example, Flash records voice and sends it to the server where Java or
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You just have a server socket in java or C/C++/C# whatever, use the flash Socket class to connect to the open socket on the server and do your transactions through that socket.
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/Socket.html
http://help.adobe.com/en_US/as3/dev/WS5b3ccc516d4fbf351e63e3d118a9b90204-7c60.html#WS5b3ccc516d4fbf351e63e3d118a9b90204-7c63
Sample code here: (Too long to paste in an answer)
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/Socket.html#includeExamplesSummary