Try to tcpdump the ppp interface (ppp0 maybe) when the connection is up.
#tcpdump -i ppp0
it wll listen to the ppp0 for any packets sent through.
if the the line is definitely idle for10 minutes without drop, it means
you have to check the
filter file and try to
allocate which configuration item accepts 10mins up. (probably, you need
to personalize your
filter file
keep all filter rules in one file and make sure that there is no policy
conflicts between your own
rules and the original
standard filter.)
otherwise you can always find the clue who is keep the line up.
Good Luck!
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