Rob Pike worked at Bell Labs, which was part of the phone company. He had access to the nice call forwarding interface. It was relatively painless for employees to forward their office number to any phone with direct inward dialing. Likewise, all outgoing calls went through an 800 number, to the switch in the office in New Jersey, and out from there. Thus, as far as caller id was concerned, it always appeared as if the employee was dialing from the phone in their office.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds