I've never heard anyone say that the OSI Model does not exist in large organizations with a diversity of systems. The Open Systems Interconnect (OSI) Reference Model is the ISO standard model for computer networking. It is the foundation for the Internet. All computer networking conforms to this model. In fact, this model enables networking among diverse systems.
Here are a few good references to learn about the OSI Model:
Dig Deeper on Simple Object Access Protocol (SOAP)
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