>> The AT&T of the Bell Labs days ... designed their own ...
True, I am old enough to have see my own employer (France Telecom) doing the same: Computers : SM80 and SM90 [0] and heavy involvement in other computers like the LCT3202. Operating system: A clone of Unix in Pascal! Phones indeed: S63 and older phones, Phone switches: E10 and software of 11F.
For me the 80" were the good old time, you well describe what came after that "just takes bids for everything from Cisco et al"
True, I am old enough to have see my own employer (France Telecom) doing the same: Computers : SM80 and SM90 [0] and heavy involvement in other computers like the LCT3202. Operating system: A clone of Unix in Pascal! Phones indeed: S63 and older phones, Phone switches: E10 and software of 11F.
For me the 80" were the good old time, you well describe what came after that "just takes bids for everything from Cisco et al"
[0] http://www.feb-patrimoine.com/projet/unix/sps7.htm