We are trying to configure a Cisco 876 router to dial out via the ISDN S/T port as the primary interface. If the primary interface is disconnected for whatever reason we would like the analogue/modem connection to automatic kick in as backup through the AUX interface. Currently both the the ISDN and modem connections dial at the same time which we don't want.
I have attached a tech-support file which contains our configuration and IOS version. Is it possible to configure this router to use the ISDN to be the main connection and the analogue service to only kick in when the ISDN goes down? Appreciate any assistance.