Dahdi Problem or not?

I have installed linux slackware 12.2 and dahdi drivers nad asterisk . Everything ok . When I reboot my linux box , everything ok but I am not able to make calls to PSTN . When I recieve the first incoming call from PSTN , then I am able to make call to PSTN .

What is wrong ?

What do the logs show when you try to make a call ? Anything unique when the first calls come in as opposed to the rest of the incoming calls ?

Hello .
The error I get in the first outgoing call is the next :

WARNING[2904]: app_dial.c:1528 dial_exec_full: Unable to create channel of type ‘DAHDI’ (cause 0 - Unknown)

Any ideas ?

Thank you .