Here are some helpful tips courtesy of Advanced Communications.
How to adjust the time on your phone system for Daylight Savings
NEC SV8100, SV8100SE, SL1100 & Xen IPK II:[SPEAKER] -> 728 -> Type in new time in 24hr format -> [SPEAKER]
As a temporary measure in the event of lightning striking your business telephone system, contact Telstra direct on 132255 to have your main number diverted to a mobile number. They provide this service for the cost of local calls*. However, as a long term solution, we can repair &/or replace (often through your insurance*) your telephone system and any affected cabling/optical fibre etc. – we promise to get your back on line ASAP!
* Disclaimer: All reasonable care has been taken to ensure that the information within is correct at the time of distribution however no warranty or responsibility is given as to the accuracy of that information.