found the option in C:\users\currentuser\appdata\roamin\avaya\one-x communicator\confix.xml
if checkbox is unchecked following config lines appear:
<name>UserEnableDialingRules</name>
<value>0</value>
</parameter>
<parameter>
if box is checked, lines disappear. but when restarting the client, config.xml gets overwritten and i dont now from where