i have a nec ipk2 networked to another ipk2 via point to point t1's. with a 3rd t1 to go to a remote site for an ip phone.

it goes something like this:

Code
            internet
                |
               t1
                |
cisco router of some sort provided by AT&T
                |
           netopia router
                |
              switch
                |
      adtran netvanta 3200 main
        |                  |
        t1                t1
        to                to
       site              site
         a                 b
        |                 |
        t1                t1
        |                 |
    adtran3200        adtran3200
        |                 |
      switch            switch
        |                 |
    ipk2 & pc's    ip phone & computer
the main site is all ok. can ping everything on site a & b.

sites a & b are the issue. they both can ping everything on everywhere BUT they cannot get on the internet. they CAN ping the netopia router but not beyond it. i feel that it is a routing issue in the adtran's somewhere. the people i have been working with seem to want to try to fix it but it may be beyond them (i know it is beyond me).

i can provide configs for the adtran units as well as the static routes in the netopia.

i was told that the router going to the internet (in this case the netopia) may not be "smart enough" to route the packets the way it needs. could this be the case? and if so would they need some sort of cisco to do this?

(my ascii drawing didn't turn out quite right so if you have questions pm or email me)

[edit: fixed your drawing - use the CODE tags.