1. Connect to the BRICK with Telnet or a terminal
2. Call the Brick with a phone or another isdn-device with the number of the
requested service
3. During the call display the "isdncalltable" and check the field
"localnumber"
After the call display "isdncallhistorytable"
4. Enter exactly this value in the incoming call answering using the setup-tool
ISDN-Slot->Incoming call answering or modify the "isdndispatchtable"