Strange behaviour of dial-up connections

[Gordon Burgess-Parker]

I have three dialups set up. In properties, on the Options page, there is a
box for "Redial when the line is dropped". All three have this checked by
default. If I dial up with one, and then either manually disconnect or use
the program's disconnection function, I immediately get a box which says
"Connection to x failed, redialing pending...." and a countdown to redial.
the other two, even though the "Redial" box is checked, do not do this.
Which is the correct behaviour, and why does one dialup behave differently
to the others, even though they are all set up identically (apart from
username, passwords and telephone numbers that is)?
If I uncheck the box on the one, the redial ceases!

Help!

 

[Gordon Burgess-Parker]

I have three dialups set up. In properties, on the Options page,
there is a box for "Redial when the line is dropped". All three have
this checked by default. If I dial up with one, and then either
manually disconnect or use the program's disconnection function, I
immediately get a box which says "Connection to x failed, redialing
pending...." and a countdown to redial. the other two, even though
the "Redial" box is checked, do not do this. Which is the correct
behaviour, and why does one dialup behave differently to the others,
even though they are all set up identically (apart from username,
passwords and telephone numbers that is)?
If I uncheck the box on the one, the redial ceases!

Help!

The answer! The one that redials is an ISP that supports Bandwidth on demand
for 64/128k ISDN, and so the "Dropped Line" function doesn't apply. the
other two (both on the same ISP, one for 64k and one for 128k) do NOT
support bandwidth on demand!