no special cad needed for SLT(single line telephones ) you can plug one in instead of a system phone or you can plug one into the AUX jack on the bottom of the phones (they would both share the same extension number and couldn't be used independently )

I know the older Partners didn't pass CID (caller ID ) info to SLT's I'm not sure about release 8

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Serving SW and West central Fl since 1984