May I add my two cents (for what it is worth).  In the "OLD" days, the
phone company wanted to know about everything that was hooked up to
"their" phone lines.  Not to be snoopy, but too many devices could and
would cause problems.  Therefore, phones had a number on them (REN for
Ringer Equivalence Number) somewhere in the nondescript print of who
made the thing, that indicated the REN number.  In the US, when you
purchased a new phone to add an extension, you were supposed to call the
phone company and give them that number.  It seems that when the total
RENs for a line became close to "4", things could go wrong.  Times have
changed and current phones with digital circuits have RENs of 0.2, so
you could have ten of then units on a line without causing problems.
But modems are like phones.  Do you have an "old" modem?  Does the
handbook give a REN?  My newest 56K modem indicates that it has a REN of
1, so maybe old isn't the answer.  But try to find the total REN of both
of your modems.  If it turns out to be close to 4, you may have found
the problem.

HTH
--
Jean Bourvic :>))

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