2040's I seen 30's (DT) but not 40's, I assume you have tried resetting the handset, and as daft as this sounds a solid whack on the desk using the entire phone can fix this not ringing thing
make sure the handset is in group & not on dnd or forward unconditional.
this is the cause of the problem you are reporting in almost all cases.
sometimes the ringer goes silent, changing the ringer volume usually resolves this.
Amridle the DT/20xx handsets came in 4 variants
DT1/2010, basic phone no display
DT3/2030, Display phone with hands free no BLF lamps
DT4/2040, Display phone no Handsfree, BLF lamps
DT5/2050, Display phone with Hnadsfree & BLF lamps
(& to be totally accurate there was also the short lived DT6
which was a DT% with RS232 to give Basic CTI on an INDeX)
DT3/2030 & DT5/2050 wer by far the most popular versions
If the handsets don't actually ring (i.e calls go to voicemail) check the wrap up time for those users. In default it's 2 secs but if set to 0 will make the phone constantly busy (after it makes its first call) but will allways be able to dial out.
If its just that the phones don't make any noise but can still be answered, then like the others have said giving em a bit of a tap sometimes works
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