Trying to start kisdndock as a non-root user gives the following message:
The KDE libraries are not designed to run with suid privileges.
ERROR: KUniqueApplication: DCOP communication error!
As the main purpose of kisdndock is to allow regular users to connect/disconnect ISDN,
this bug makes it useless.
It's fixed in kisdndock-0.9.0-3. It will go into next rawhide release.