Apps that try to do net-to-nat

["Jago Pearce" <jago25_98@xxxxxxxxxxx>]

I'm behind NAT at work and I need to connect to home, which is also behind 
NAT.

What programs have tried to get past the NAT problem? I heard that mnet, the 
p2p program uses a ticketing system to pass messages. Any other programs 
that have attempted to do nat-to-nat and done so successfully? In particular 
- VoIP?

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