[asterisk-users] Cannot hear voice through SIP Phone from one side

[Erik Anderson]

On Feb 5, 2008 2:32 PM, Sanjoy Rath <sanjoy_rath at yahoo.com> wrote:
>
> The Asterisk server is a linux server. There is no firewall between the servers. It is in a DMZ.

My bet is that it's not a *true* DMZ.  You're still dealing with NAT,
and that's what's causing the one-way audio.

This topic has been discussed ad nauseam on the list and is documented
quite well on the wiki - search there and you'll most likely find the
answers you're looking for.

-erik