You can set the ACU-1000/2000/5000/T/M to have modules patched together on whenever it powers on. In order to do so, follow the appropriate instructions for your system below.
ACU-Z1/Z-Series Controller
The state of the interoperability nets will remain persistent across power cycles.
ACU-1000/2000/T
Set the patch(es) that you want to have on boot, then enter "*36" on the front/top keypad. You will get a voice prompt saying "Saving configuration." to confirm.
ACU-M
Set the patch(es) that you want to have on boot, then from the home dialog on the front panel, choose Nets, and Pwr On Cfg.
ACU-5000
The ACU-5000 will let you restore the interoperability nets that were last set in the GUI. Under Preferences > System Memory Setting > Restore Nets on Power Up should be set to Yes for this behavior. Note that VoIP and PSTN connections will require additional actions for complete restoration of the initial nets – that is, the operator (or external user) will have to call back to restore the external connection.