How to set owner/group for zap kernel udev files, meetme err

Hi,

When I load ztdummy module
modprobe ztdummy
files in /dev/zap have the following permissions:
crw-rw---- 1 root dialout 196, 254 2008-02-06 11:45 channel
crw-rw---- 1 root dialout 196, 0 2008-02-06 11:45 ctl
crw-rw---- 1 root dialout 196, 255 2008-02-06 11:45 pseudo
crw-rw---- 1 root dialout 196, 253 2008-02-06 11:45 timer
crw-rw---- 1 asterisk asterisk 196, 250 2008-02-06 11:45 transcode

When I change owner and group of this files asterisk is able to access
them. Access problems causes for instance meetme app conference creation error.

Thanks in advance
regards
tomasz