Batboard

Hi all,
Picked up a DTMF front for a MT1000 at local flea market. Front does not work and RSS does not recognize it. Seems it's a non standard part, can't find reference in maual. Anybody have any info on a NTN4958A-(S).
Thanks,
Ken

RSS does not recognise my DTMF front on the MT1000 either, but the tones work just fine, as does the DTMF memory. So I decided not to worry about it beyond that.