Headset Adaptors for Kyocera -- 2.5 male to 3.5 female, 4 ring -- does it exist?

[alice postpost]

I am trying to connect a Moshi Moshi handset to a Kyocera phone -- and a standard 3 ring adaptor does not work.

Anyone have any idea, if there is a 4 ring adaptor for this?

Thanks.