Cisco : T1 with ISDN Backup

service timestamps debug uptime
service timestamps log uptime  
service password-encryption    
no service tcp-small-servers   
no service udp-small-servers   
!
hostname HOSTNAME 
!
enable password ENABLEPASSWORD
!
ip subnet-zero
ip name-server 129.250.35.250
ip name-server 129.250.35.251
isdn switch-type basic-ni1   
ip routing                   
!
interface Ethernet 0
 no shutdown          
 description connected to EthernetLAN
 ip address IPADDRESS SUBNETMASK
 no keepalive                        
!
interface Serial0
 no shutdown        
 description Leased Line to Infomart
 service-module t1 framing esf
 service-module t1 linecode b8zs
 ip address 199.1.127.2 255.255.255.252
 encapsulation hdlc
!
interface BRI0
 description ISDN Backup to Verio
 ip unnumbered Ethernet0
 no ip mroute-cache              
 encapsulation ppp             
 isdn spid1 SPID1 DIRECTORYNUMBER1
 isdn spid2 SPID2 DIRECTORYNUMBER2
 dialer rotary-group 1
 no fair-queue
 no shutdown
!
interface Dialer1
 ip unnumbered Ethernet0
 no ip mroute-cache        
 encapsulation ppp         
 bandwidth 128000          
 dialer in-band            
 dialer idle-timeout 3600  
 dialer string ISDNDIALNUMBER
 dialer load-threshold 1 outbound                  
 dialer-group 1                                    
 ppp authentication pap callin                     
 ppp pap sent-username USERNAME password PASSWORD
 ppp multilink  
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0
ip route 0.0.0.0 0.0.0.0 Dialer1 100
access-list 103 permit ip any any           
dialer-list 1 protocol ip permit
!
line console 0
 password CONSOLEPASSWORD
 login              
 exec-timeout 0 0
!
line vty 0 4
 password TELNETPASSWORD
 login
!
end
!