[asterisk-users] IAX Problem

[bob gailer]

I have2 Trixbox Servers. Each has an IAX trunks to the other. One works 
the other fails:

     -- Executing [s at macro-dialout-trunk:19] Dial("SIP/526-09eec7c8", 
"IAX2/InterOffice/210,300,tr") in new stack
     -- Called InterOffice/210
     -- Hungup 'IAX2/InterOffice-7578'
   == Everyone is busy/congested at this time (1:0/0/1)

The only difference I am aware of is that one server has a public IP 
address, the other is behind a NAT.

The trunk from the server with the public address works fine.

I added nat=yes to the other's peer details - did not help.

What should I do?

-- 
Bob Gailer
919-636-4239
Chapel Hill NC