Hey,

I was approached by a client who need to set up isdn access with a regular phone dialup backup. I know it sounds weird but it's the way the client wants it due to budget retrainst and also because in the area's he wants it there are no other services available....
He is gettting cisco 3640 with a nm4bst and nm-8as and a whole bunch of 1720 ....
the problem i got while writing the configs is that if the isdn goes down, the pots does take over yet once the isdn is reestablished, the pots still stays up ....
i got a tac opened on priority 2 for 3 weeks and they still ahve no clue...
would anyone have any ideas ?

here are a couple of things i tried:
-1 dialer pool with both isdn and pots tied to it so that there would be one route only
has the results described above ...
-2 dialer pools with 2 routes:
*2 routes of different metrics does'nt work since it won't switch over, even when using priorities ...
*2 routes of equal metrics: splits the packets on both routes ... that was predictable yet i had to try it... if you assign priorities, there won't be any switch over yet it will only use one route...
-dynamic routing: rip &ospf i know it's pointless over ddr and one/two routes yet it doesn't work (that is the only thing the tac was certain)

so if you have any suggestions let me know !!!
thanks