I am trying to connect an IAX ATA to an Asterisk system.  The Asterisk 
system has been stable for years, and has no trouble bridge SIP phone sets to 
IAX trunks.

When I initiate a call from the IAX ATA, something goes wrong.    One rare 
occasion it works fine, but usually there is no audio passed.  I have a snippet 
of the console below.  Notice no bridging message...not sure if that's a clue?  
The dialplan seems to execute properly, and I can watch the destination system 
which answers the call and starts playing media (monkeys) which I don't hear.

Any ideas on what is going on?  Since this is IAX in and IAX out, NAT should 
not be an issue (even through there is NAT on both sides).  Since media moves 
on the same UDP port as call setup, also proves should not be a network problem 
(I think)

Can someone point me to a solution?


(IP's and ISP and phone number disguised)

- Executing [s@macro-dialexternal:57] GotoIf("IAX2/S-14468", "1?dialnormal") in 
new stack
    -- Goto (macro-dialexternal,s,60)
    -- Executing [s@macro-dialexternal:60] Dial("IAX2/S-14468", 
"IAX2/ISP123/1234567890|60|W") in new stack
    -- Called ISP123/1234567890
    -- Call accepted by (format ulaw)
    -- Format for call is ulaw
    -- IAX2/ISP123-2261 answered IAX2/S-14468
    -- Channel 'IAX2/S-14468' ready to transfer
    -- Channel 'IAX2/ISP123-2261' ready to transfer
    -- Hungup 'IAX2/ISP123-2261'
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