asterisk users - Jan 2007 - IAX call path optimization with more than 3 legs

hi list,

after connecting 3 asterisk servers via IAX in a line
(+ 1 client at each end), i noticed that call path
optimization happens only one time, i.e. only one
node/leg in the path can be reduced.
Does anybody know if this is the intended behaviour or
if it's a bug? 
Can anyone confirm my observations?
It seems that the first node, that sends the TXREQ
Message, is "optimized".

For better understanding:
before optimization:
C1 <----> A1 <----> A2 <----> A3 <----> C2
after:
C1 <----> A1 <----> A2 <----> C2

C1/2: Client with Kiax application
A1/2/3: Asterisk Server 1.2.12.1, on Ubuntu Linux
<---.>: Connection via IAX protocol

thanx for reading, Ramon

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