Bellcore/Telcordia was spun out from Bell Labs as the R&D lab of the Baby Bells after the early 1980s antitrust suit against AT&T. Before the breakup, there were a number of labs that composed Bell Labs in NJ, not only in Holmdel.

My father worked in Morristown at Telcordia Technologies/Bellcore in the 1980s/90s and before that at Bell Labs in the 70s.