Quote:
Originally Posted by Gridiron
We would like to know what the switch lever labelled 3 on the illustration is for,
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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.