I am looking for a telephone of this type with an ISDN connection and a 3.5mm connector so that I can connect my headphones to it without an adapter. Is there such a thing?

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There are adapters for 2.5 to 3.5mm if that helps?

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Thank you for the message. Are you sure about the 3.5mm connector, because in your description of the item it says:
Connectors
Headphone jack 2.5mmi Yes

Greetings P. Metzler

Answer

This unit offers you a 3.5mm connection for headphones or similar.
Unfortunately, however, there is no ISD connection as this unit is only an additional mobile part.
A possible device is the C 530 IP, article 2738882.

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Question about Gigaset C530 Hx

I am looking for a telephone of this type with an ISDN connection and a 3.5mm connector so that I can connect my headphones to it without an adapter. Is there such a thing?