The following is the 3620 config:
interface Loopback0
ip address 40.126.249.1 255.255.255.255
no ip directed-broadcast
interface Serial0/0
physical-layer async
ip unnumbered Loopback0
no ip directed-broadcast
encapsulation ppp
dialer in-band
dialer string 3398102
dialer-group 1
async mode dedicated
priority-group 1
interface Serial1/3
backup delay 0 60
backup interface Serial0/0
ip address 40.126.247.2 255.255.255.252
no ip directed-broadcast
priority-group 1
router eigrp 100
network 40.0.0.0
no auto-summary
This is the centre 3640 config
interface Loopback0
ip address 40.126.248.251 255.255.255.255
no ip directed-broadcast
interface Group-Async0
ip unnumbered Loopback0
no ip directed-broadcast
encapsulation ppp
dialer in-band
async mode dedicated
group-range 65 80
router eigrp 100
network 40.0.0.0
no auto-summary
line 65 80
modem InOut
modem autoconfigure discovery
transport input all
flowcontrol hardware
Thanks for your help.
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