[asterisk-users] IAX: No outgoing audio for 10 seconds

[randulo]

I have an IAX hardphone connected to an Asterisk appliance sending and
receiving calls via IAX to three different providers. The appliance is
currently connected to a NAT router. The appliance is purposely being
set up via the GUI, not in messing with any config directly.
One of the "service providers"  is my other asterisk box on a
different Internet connection. In all cases, outgoing audio is silent
for about 10 seconds. If this were SIP, I'd immediately be suspicious
of NAT problems, but IAX? Ideas? I will be trying to hang the
appliance on the Internet directly but at the moment, this can't
happen.