I usually take care of a 2400, but I was "borrowed" to service a 2000IVS in another (off-campus) department of the university I work for..

The problem affects the analog phones - sometimes
you get a dialtone, sometimes you don't.

When you do, DTMF doesn't break the dialtone.

The DTerms on the system are unaffected - they can
dial other stations (even analog) and to the trunks,
and send DTMF to external services (like auto-attendants, etc).

This box has one PN-RSTBA DTMF receiver card,
located in PIM 1 (the whole thing has 2 PIMS).

Does this card handle DTMF for the entire box?
Someone suggested the CPU card handles DTMF
for PIM 0...

Am I going in the right direction?

Thanks,

Phil