Using many modems

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Multiple B channels on ISDN lines (either BRI, PRI, or E-1) do not get
"Ring" at the same time. The switch will select an active B channel that has
been configured to accept an inbound call, and signal that B channel to go
active. The device at the other end configured to use that B channel will go
off hook. It is possible to assign the same number to a group of channels
(ie - a trunk group in telephony-speak), but only a single B channel will
get activated per inbound call. It, in effect, takes on the traits of a 'hunt
group'.

What you have sounds just plain strange for modem-dial applications (as 
compared to having a handful of people with phones on their desk that can
arbitrate amongst themselves). The m/v-getty implementation is correct
for modems. Your expected usage of your phone system is what is non-typical,
and it really should be corrected.
	-Brian