Telephone ATT/Philps Tel 5ESS-PBX Host step by step tones. - Video Dailymotion
This is a Step By Step tone for the Telephone Switch Type: ATT/Philps Tel 5ESS-PBX Host.
I still wanna know what kind of ROH tone that is. I still wanna know the Technical name for this tone and What kind of Device or equopment this is.
I just love to watch trains and explore the history of Telephone Exchanges.
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