asterisk users - Jun 2003 - Stopping the ADSI <BBBOOIIIINNNNGGG!!!!> on call wait

I don't mind the slight diminution in my hearing faculties that accrues 
each time I have a call come in while I'm talking from (I think I have 
this straight) the ADSI tone, but yesterday one of my callers asked me, 
"You OK?" after it sounded, so it must be at least minimally audible
to
the other party.

Any way to quell it?

Thanks.

B.