AASTRA 600d for Aastra 800 and OpenCom 100 User Guide EN - Manual (Page 28)

Commissioning
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Registration
Anytime the mobile unit is checked in/registered with a communications system, this
registration is saved on the device. A registration entry includes a system name.
When you have checked onto the system with your mobile unit, the system name
appears on the display. You can change the registration entry data as needed. To do
so, call the
> System > Subscriptions menu. Select the desired registration entry
and change the data (please refer to page 112).
Checking In
After the mobile unit has been registered on one or more communications systems,
you can make calls. If you have activated the Auto Search feature (see page 112), the
mobile unit (when idle) will automatically select the closest available system and
check in there. If you do not wish to use the Auto Search feature, you can execute an
exclusive search for a desired system based on the saved registration entries.