It IS Philips DCS255 , but it was delivered to us by ABB.
In fact, we got it as a donation of European Community.
We had problems while only activating ISDN trunks and we communicated with their support in ABB and also with a man who represents Philips for our area ... and we did solve that ... only DDI stayed unsolved ...
It is not something that has to be done, we just wanted to get to know better with this PABX, when we already have it.