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Old 13th Oct 2021, 3:49 pm   #5
Join Date: Feb 2010
Location: Duffort, Gers, France
Posts: 635
Default Re: Another Siemens and Halske Telephone

Originally Posted by Gridiron View Post
We would like to know what the switch lever labelled 3 on the illustration is for,
As far as I can see it switches between internal (Hausverkehr) and external (Amtsverbindung) operation. If for example there is an incoming external call to the main phone which needs to be transferred to an extension then you can switch the switch from Amt (exchange) to Rückfrage (Inquiry) to call the internal extension whilst holding the call.

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