interface Serial3/0:23
 no ip address
 encapsulation ppp
 dialer rotary-group 10
 dialer-group 5
 autodetect encapsulation ppp v120 lapb-ta
 isdn switch-type primary-ni
 isdn incoming-voice modem
 ppp authentication chap
 ppp multilink
 no cdp enable

interface Dialer10
 ip unnumbered Loopback3
 encapsulation ppp
 dialer in-band
 dialer idle-timeout 0
 dialer-group 5
 peer default ip address pool isdn
 ppp multilink
 no cdp enable
 hold-queue 5 out

interface Group-Async0
 ip unnumbered Loopback3
 encapsulation ppp
 dialer in-band
 dialer idle-timeout 0
 dialer-group 5
 peer default ip address pool async
 async mode interactive
 no keepalive
 ppp authentication chap
 ppp multilink
 group-range 1/0 1/23