[Asterisk-Users] NAT Far End Traversal

[Jean-Michel Hiver]

Hi List,

After some research, it seems the only reasonable thing to do in order 
to get SIP phones behind NAT working reasonably well without fiddling 
with the DSL router is to have some kind of far end nat traversal mechanism.

Is there any way to do this with open source tools? I've seen somewhere 
that far end nat traversal can be achieved with SER + nathelper does the 
job... has anybody gotten this working  in conjunction with Asterisk?

Another question... Are you aware of a SIP ATA or phone that has some 
kind of VPN (i.e. PPTP) client embedded in? This would make the NAT 
problem go away nicely and provide added security...

Cheers,
Jean-Michel.