asterisk users - Nov 2010 - Asterisk disconnected suddenly

Hi

I? m sorry.
I mailed the similar question last time.
Asterisk disconnected suddenly by 135 simultaneous calls (1CPS)  everytime.
Has someone met something similar ?
I attached message log  that disconnect error occurred.
And I tried to reload configuration  manually.
Any related error reason in the logs?

version 1.6.1.11
CentOS 5.3
Server spec cpu MHz :1800.000 MemoryTotal:2075456 kB

Thanks

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