[asterisk-users] IAX2 TRUNK CPU consumption

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Hi,

I have a strange problem about the cpu consumption of a IAX trunk.
I have two asterisk connected by a IAX trunk.
The asterisk number 1 is installed on a Soekris Box


Asterisk 1         Asterisk 2
            IAX T
      |   ---------->      |


I use another asterisk to generate some traffic

Asterisk 0    * 1            * 2
         SIP         IAX T
    | ---------> | ---------> |

I see that when on the * n. 2 the console prints this message the cpu
consumption is low:

  -- Hungup 'IAX2/test-16'
     -- Accepting AUTHENTICATED call from 192.168.x.xxx:
        > requested format = ulaw,
        > requested prefs = (unknown),
        > actual format = ulaw,
        > host prefs = (ulaw),
        > priority = mine


But when the console prints this message the cpu consumption is high:

requested prefs = (unknown|unknown|jpeg|lpc10|ulaw|unknown)

MOST IMPORTANT: the two different messages appears with the same call
generator, and I not understand why the same situation create different
messages?

Any idea to resolve the problem?
Thanks Matteo