The bottom one appears to be a router or modem for an ISDN network which was a high speed network that was available prior to broadband being introduced. It wasn't particularly widespread, certainly not on a public level but businesses used it.
I would imagine that the phones in the upper picture were used to talk using the same ISDN network that the box is for or maybe just for chatting via the DC whilst it's connected to the dial up? They look like mobile phones though, as they have little aerials. Maybe the phones are standard but the lead just allows them to work with the DC?
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