The IBM 8750 Business Communications System was a voice and data switching system PABX, suitable for medium to large numbers of extensions, used on customer premises." The 8750 was the European version of the IBM 9751, also a ROLM design. 
In 1984, IBM bought the American company ROLM. In 1987 IBM started to market the ROLM-derived IBM 8750 in Austria, Belgium, France, Germany, Italy, Luxemburg, and the UK. Principally for homologation, a few had been installed in IBM locations, such as IBM Havant in England – however none were installed in customer locations.
The 8750 had from 91 to 3000 telephone extensions; up to 1000 simultaneous conversations; a computer based on a Motorola 68020; up to 16 IBM 8755 Operator Consoles; a 30MB fixed disk; main/satellite working with IBM 3750 and 1750 Switching Systems; digital trunks in Belgium, Italy and the UK; and ISDN and Systems Network Architecture (SNA) networks. 
IBM later sold ROLM to Siemens who then continued to market the 8750.
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