Open a socket from a LAN (with a proxy connect to internet) to outside

Hi everybody
I have a chat program that opens a socket through which I sent voice data. Every one that wants to receive voice must open a sockect to the computer sending the voice. (It means that if you want to send data you must open a socket to another computer and if you want to receive you S.O. must open a socket to you). It works ok with all computers inside the LAN. Now I'd like to stablish a connection to a computer which is outside this LAN (my computer at home). From here, using some ports which are not closed by the firewall at the proxy I can connect my computer at home.
My questions are:
Can I use the same socket to send and receive data? Or they are only 'one-way' direction, so I need another socket from home to here?
How can I open the socket from home to here? Is there a way to send my computer at home the whole addres at work? I mean sent my computer at home my 'mac address' or something so the proxy knows where to send the packages received from outside?
Thanks,
Dani.
I WILL GIVE YOU 10 DUKES IF YOUR SOLUTION WORKS.

How can I open the socket from home to here? Isthere
a way to send my computer at home the whole addresat
work? I mean sent my computer at home my 'mac
address' or something so the proxy knows where to
send the packages received from outside?This can't be done (as far as I know).
/KajOr, well. You might be able to configure the proxy to do port forwarding, but I guess that you don't want to do that?

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