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I would like to thank everyone for providing their proposals.
I also considered Ericsson's "BusinessPhone", but was not sure whether that is a common German term. Probably, it is rather a product name as noted.
I also think that "Geschaeftsleitung" is a little ambigous and "Geschaeftstelefon" does not address the word "line" in the Japanese.
What does everybody think about "Geschaeftsanschluss"?
Is this term common in Germany? Please kindly add your comments.
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4 hrs confidence:
Explanation: Scheint ein Produkt von Ericsson zu sein (siehe Links).