Sorry, I never explained properley.
A 3213 has the name "Marc" "Pollington" in the NIINI.
When the 3213 calls another 3213 it displays as "M Pollington" which is fine.
When the 3213 calls a 4225 it displays only "Pollington" on the display of the 4225, which is not fine.
The customer is unhappy because the 4225 has a much bigger screnn, but appears to show less info about the caller than a rubbish 3213...