You might look into a PM3-1T and a partial PRI.
AFAIK the 3Com (USR) system does not do DOSBS. You'd be able to do ISDN
DATA and modems.
The other option is an Ascend MAX1800. AFAIK you can do ISDN DOSBS, ISDN
DATA, and modems - but you will need to make sure the telco can give
you *two* hunt numbers on the BRI. One number will take ISDN DOSBS and DATA,
the other modems. MAXen can't auto-detect like a PM. Note I'm not 100% sure
of the MAX1800's cpaabilities - I don't run into them much, but I believe
they are functionally just like the 4000/6000.
Another option is an Adtran Atlas 800 to turn incoming BRIs into a PRI and
feed those into a PM-3.
-MZ
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