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One other option is a persistent static route in the OS.Do a route print on one of the affected devices and see if you see two gateways there, if you do check to see if the wrong one is listed as persistent. If it is then delete it manually.
You can do either, but configuring the dialer and then associating it with the ISDN interface is the best way to go.Follow this link for config guide:http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fdial_c/fnsprt5/index.htmEDI...
