interface BRI2/4
 ip unnumbered Loopback0
 encapsulation ppp
 dialer idle-timeout 300
 isdn switch-type basic-net3
 isdn incoming-voice modem
 no cdp enable
 ppp authentication pap callin
!
interface BRI2/5
 ip unnumbered Loopback0
 encapsulation ppp
 dialer idle-timeout 300
 isdn switch-type basic-net3
 isdn incoming-voice modem
 no cdp enable
 ppp authentication pap callin
!
interface BRI2/6
 ip unnumbered Loopback0
 encapsulation ppp
 dialer idle-timeout 300
 isdn switch-type basic-net3
 isdn incoming-voice modem
 no cdp enable
 ppp authentication pap callin
!
interface BRI2/7
 ip unnumbered Loopback0
 encapsulation ppp
 dialer idle-timeout 300
 isdn switch-type basic-net3
 isdn incoming-voice modem
 no cdp enable
 ppp authentication pap callin
!