I had this kind of problem some years ago. What was happening was that the phone (a T200 from memory) was across
the line, and after about 15 minutes its internal electronics (presumably powered via a capacitor), was coming online
for a drink, this line loading to power the internal electronics of the phone was distorting the modem signals
enough to upset the modems and cause a drop.
The solution was to change the phone.
Do you have a phone on the same line?
I was suffering a similar problem with my dialup account (it was disconnecting after about 20 min all the time). I discovered that apparently some older touch-tone telephones can cause enough interference on the line to cause a disconection. After I removed my telephone from the double adapter I was using to split the phone line I had no problems.
-- SLUG - Sydney Linux User's Group - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
