This used to be called bonding, and is a PPP feature.  First things first,
check the ISP;  do they support bonding?  Once upon a time, they could
claim to, but if you made the call on the first channel (B1), and then
called up and bonded the second channel (B2), they often had to be  in
contiguous ports in the ISP's system.  If non-contiguous, the best you got
was two independent B-channel connections, which was an improvement, save
that a download would be on whichever B channel it got started on and would
never exceed 56k or 64k... Bonding makes both channels share, in the short
explanation this makes the 128k bandwidth available to any stream.
Over-simplified, I know.  Upshot is, current routers at the ISP end do
handle non-contiguous bonding if they bother to enable it, sometimes.  The
old horror stories of B2 channels up but not utilized, of paying for 128k
and getting only 56k, of two B channels not even knowing each other, I gave
up on ISDN a long time ago.  Besides, in Maine they tarriffed the data
charges at >2cents/min/channel.  Too $$$.  

Just for the heck of it, they can get ISDN there?  Even that has distance
limits.    I wonder sometimes if the telcos do this stuff on purpose...

Rick
Rick Blake
[EMAIL PROTECTED]
http://www.cybernexus.net
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