An ISDN PBX concept from Philips. Sopho stands for Synergetic Open PHilips Office system. The main product is the iS3000 telephony exchange. Strong points are the integrated DECT system, redundant architecture and networking. You can find this system a lot in The Netherlands under the KPN name Vox-6200, in Germany under the Deutsche Telekom name Oktopus-S and in various other European and Arabian counties. Configurations can vary from 96 to 140000 pbx ports.