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Are there any In-band signaling systems still in use in all of America?

Posted: December 22nd, 2009 | Author: Crusher | Filed under: Business Telephone Systems | Tags: , , | 1 Comment »
telephone systems
Flashdealer asked:


I’m pretty sure everything is now out-of-band and digital but I was curious to see if there was a far remote part of America or even North America that still use the old in-band telephone system or even an ancient crossbar system.

Additional, if the are no longer any in-band systems operating in America, I would be very curious to figure out when / where the last operational phone system of this nature shut down.

One Comment on “Are there any In-band signaling systems still in use in all of America?”

  1. #1 wa2aqq said at 8:01 pm on December 23rd, 2009:

    There are no crossbar or step by step switches left however there are many in band signaling trunks left particularly from small exchanges such as DMS 10s or even DMS 100s These are general from smaller companies that connect to long distance carriers via a tandem exchange owned usually by a baby Bell

    Bob who is a telecommunications engineer