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Cisco 876W ISDN ISP Dial-Up Configuration.

I have a Cisco 876W router and would like some assistance to enable the router to connect to ISP using the ISDN interface as the WAN link. The IOS has been upgraded to c870-advipservicesk9-mz.124-15.T7.bin. I have attached the running-config file and the output of the show version command. The link led light on the router front panel is lit and the cd light is also blinking. The BRI0 & Dialer0 config were obtained from website. Please know that I am relatively new to cisco routers. I have tried different ISDN cables between telco ISDN unit and the router (all to no avail). Is a chat script required to initialize the ISDN dial up system in a way analagous to modem chat script initialization? SDM Config helped set up basic router configuration. Do i need to contact ISP for advice from their side?

kind regards,

P. O'C.