I very specifically used and heard used around me these exact verbatim terms and I can tell you the cultural divide was palpable between the two camps one from

I very specifically used and heard used around me these exact verbatim terms and I can tell you the cultural divide was palpable between the two camps one from valley startups another from post monopoly AT&T. This influenced decisions on building wires all the way up to wan/transmission and standards. The Class 5 PSTN approach vs the best effort of VoIP Packet switching, IP as Ethernet everywhere vs ATM and Frame Relay nailed circuits, the ITU vs the IETF overlaps. H323 vs SIP is a perfect example of this tension and in fact the categories still exist. H323/Megaco/QSIG et al reference designs are precursors of the spaghetti of 5G/IMS etc and SIP is still the simplified out of band signaling template for many Web protocols. Back then there was more friction because Internet and Data Comms was the new kid on the block basically disrupting a fairly established PSTN / Post & Telegraph infrastructure. And I say all this as NetHead who had many BellHead friends so it never got in the way of going out to lunch together.