first,please run rm -rf /lib/modules/2.6(your kernel)/dahdi/ to delect the original dahdi drivers, then update your dahdi using the following links driver.
downloads.openvox.cn/pub/drivers/dahdi-l...2.4.1.2+2.4.1.tar.gz
you can see the EC status (inactive to active) using the command cat /proc/dahdi/1 when you are call out.
if still have problem, please contact me via the following IM tools
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skype: chunlei.yi