How to increase the maximum call for gnuGK? Thanks!

Hi,

I built gnuGK from CVS on centOS6.4 successfully, when I test it, I found
when the call number is more than around 126, I got the following error:
...
Assertion fail: Operating System error, file ptlib/unix/tlibthrd.cxx, line
402, Error=24
<A>bort, <C>ore dump, <I>gnore? a
...

the relative assert code is:
...
PAssertOS(::pipe(unblockPipe) == 0);
...

I searched and found the following solution (ulimit -n 32768):
http://sourceforge.net/p/openh323gk/mailman/message/30192181/

after I run ulimit -n 32768, then start gnuGK, I don't get the assert-error
anymore, but I still cannot make more than around 126 calls. i.e., there is
no error message now, but the extra call will be rejected if the
call-number is more than around 126.

Could you tell me how I can increase the maximum call? is there any
parameter of gnuGK or linux I can modify so I can make more calls? Thanks!

Regards,
Bo Xu

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