While reading an old manual for a ISDN modem, I came across a paragraph about OEM systems where the author of the manual, one B. Monkhorst of Teles Benelux B.V. who owned a Commodore PC with only 16 Mb of RAM and a AWE-32 back in 1997 (author not mentioned elsewhere in the manual), placed a graphic with a likely valid fully readable Windows 95 key (32096-OEM-0016597-42469). 😅

Some of the error messages are also pretty funny - apparently the modem driver can't be used together with TrueType fonts in Windows 95 (i.e. most of the fonts in Win95). Entering text using a TrueType font or trying to print the font will display an error message, and the only 'solutions' are disabling the ISDN modem driver or not using TrueType fonts 🤣

The manual is badly written and has 1/4 of its 40 pages dedicated to error messages the ISDN modem software can cause, tells you something about the quality of the product 😵 . The reason there's a paragraph about OEM systems is that those can apparently cause more error messages 🤣 . There are also some error messages that are not mentioned in the manual (one is handwritten on the manual), and what I remember of it was that installing and setting up the modem was an absolute nightmare.

TL;DR-version: ISDN modems made by Teles Benelux and their software are garbage and should be destroyed as quickly as possible. Their manuals however may be kept for the humour value.