[Asterisk-Users] SIP Clients over Wan losing connection

[Dan Levine]

Hi everyone,

I have setup a couple of softphones outside of the internal network.
They work perfectly except that after a little while you can no longer
ring their extensions from the internal system to them.  Asterisk just
says "Goodbye".  I'm almost 95% sure it's because of a Nat issue.  I
have tried almost every type of network connection option in Xten, what
seems to work perfectly is putting a VPN client on the computer and
connecting to the VPN.  

Is a VPN my only solution?

Thanks a lot 

Dan