Voice chat for LAN Working :) ,  but For Internet Voice Chat Not Working

Hi, all I have developed voice chat for lan , but when i try to connect to internet it doesn't working. Pls let me know the reason why is it so?
I am behind the Firewall and firewall doesn't allow me to connect to server or transmit RTP data to the another User. Why is it So. Please Reply As Soon As Possible!!!!

That's exactly what i am talking about. Your IP address is private. Means, it is not routable outside your organization. Means, that you cannot receive anything from outside, because technically this private address does not exist outside your network.
However, you might be able to send audio to someone outside who has public IP address (PLEASE, read up about private and public IPv4 addresses and NAT in order to understand what your problem is. Just one Wiki page that you can dig up in Google.com).
Now you simply cannot use your chat from inside your organization to chat with outside people. It will not work. You need public IP addresses in both ends (i.e. you and remote party) + firewall rules must allow UDP traffic for certain ports, that your program uses.
If you want to overcome private addressing problem manually, i dont know how to do it. But what i know for sure is that it would be painful. My application that i made uses a VoIP server (SIP server and an RTP proxy server). These servers do private address handling (NAT handling) for my audio/video streams.
You have an option though. Go to your network admin and lick his/her brain. Ask for a public IP address (they might have some in reserve). Do the same thing at the remote end.

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