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Originally posted by usasniper1
reply to post by bg_socalif
1963 or 1964 North Electric co. Our crew or 6 installed, tested, & trained US Military personnel how to run a 412L 'ESC' Electronic switching center, dtmf & tdmf similar to the VOIP that most people use on their PC's today. The
ESC was an AUTOVON interface for SUBCOMPAC of the 1960's..
Kindsback cave (declassifed) Germany was another secret/topsecret site that we installed the ESC in for NATO.
We also did several in SEATO for MACTHAI & MACV.