Pb about chanspy zaptel and playback


I’m encountering a strange pb. I’ve just installed Asterisk 1.4.11 with Zaptel 1.4.5 on a debian. I’ve recompiled the kernel with a clock timer at 1000hz and CRC_CCITT =Y.
It’ seems to work fine but now :
When Zaptel is working (lsmod shows that ztdummy is loaded)
the applications playback and Queue don’t work

When i start zttool nothng goes wrong and the accuracy is about 99.9%

Another point is that the application chanspy() does’nt work properly (there is some distortion and sometimes the listened channel hungs up) but i don’t know if there is a link with zaptel problem.

Have you any idea

Thanks in advance.