CISCO 1720+电信ISDN专线怎么配置？？急！！！...

两条ISDN专线.两端用的是1720的路由器和WIC 1B S/T的卡。我按最书上和网上的很多资料进行配置。但就是不通。电信说线路没有问题。我估计还是我配置上有问题。请问各位，能给小弟一个简单快捷的配置方法和步骤吗？在些感激不尽！！！！

谢谢各位。先把配置发上来。望大家帮帮忙。谢谢！！

Cisco1720#sh run Building configuration...

Current configuration : 1158 bytes ! version 12.1 no service single-slot-reload-enable service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname Cisco1720 ! no logging buffered no logging buffered logging rate-limit console 10 except errors enable secret 5 $1$QzT.$cxt6synROrKTlxGUUAs8K1 ! username Nantou password 0 1720 memory-size iomem 25 ip subnet-zero no ip finger ! isdn switch-type basic-net3 ! ! ! interface BRI0 description connected to Router ip unnumbered FastEthernet0 encapsulation ppp dialer rotary-group 1 isdn switch-type basic-net3 no cdp enable ! interface FastEthernet0 ip address 10.40.67.161 255.255.255.224 speed auto ! interface Dialer1 description connected to Router ip unnumbered FastEthernet0 encapsulation ppp no ip split-horizon dialer in-band dialer string 83262759 dialer hold-queue 10 dialer-group 1 snapshot server 15 dialer no cdp enable ! ip classless ip route 0.0.0.0 0.0.0.0 Dialer1 ip route 10.0.0.0 255.0.0.0 BRI0 ip route 10.40.66.0 255.255.255.0 10.40.66.2 no ip http server ! ! line con 0 transport input none line aux 0 line vty 0 4 password 1720 login ! no scheduler allocate end