I worked on the Monash Medical Center refirb of Raulands gear a few years ago.
Not sure about 2010 but 5 years ago it was very propritery and fiddly to make sure the connectors are making contact; they are not RJ connectors (except on the desk annunciators) but like a pcb connector that you self terminate to solid cat5e.
Each end device is cabled back to a bus module, each slot in the module controls a certain call state (emerg, staff, nurse ect)
You can then have your handsets call to the admin phone set via the bus system and this will ping on the annuciators also.
As far as P.C programming goes I know little but from what I have seen its not too difficult very similar to Xacom or Austco (in concept not interface)
hope this helps a touch!
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