Multiple ISDN dialer stops routing

Question

Hi,
I have a 1721 with the BRI WICs.
The router is used for remote control for a series (20 different) sites, which callback for security reason.
It happens that after a while (two hours of operation) when I ping a site, the router starts dialing, but routing never occours and, after another piece of time, if I ping the router does not dial, even if debugging shows interesting traffic.
This is a sample of the configuration:
hostname myhost
username Site1 password Site1
username Site2 password Site2
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
no ip domain lookup
no ip cef
ip audit po max-events 100
no ftp-server write-enable
isdn switch-type basic-net3
interface BRI0
bandwidth 128
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
no cdp enable
ppp multilink
interface BRI1
bandwidth 128
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
no cdp enable
ppp multilink
interface FastEthernet0
ip address 10.0.0.1 255.255.255.0
speed 100
full-duplex
no cdp enable
interface Dialer1
bandwidth 128
ip address 172.16.1.253 255.255.255.252
encapsulation ppp
dialer pool 1
dialer remote-name Site1
dialer idle-timeout 30
dialer string 0XXXXXXX
dialer caller XXXXXXX
dialer load-threshold 1 either
dialer-group 1
no cdp enable
ppp multilink
other dialer are similar, then
ip classless
ip route 192.168.1.0 255.255.255.0 Dialer1
access-list 100 deny 53 any any
access-list 100 deny 55 any any
access-list 100 deny 77 any any
access-list 100 deny pim any any
access-list 100 deny udp any eq netbios-dgm any
access-list 100 deny udp any eq netbios-ns any
access-list 100 deny udp any eq netbios-ss any
access-list 100 permit ip any any
dialer-list 1 protocol ip list 100
What's wrong with this???
Help please!
Thanks in advance

Answer 1

I'll try to remove the multilink's and I'll tell what will happen. Anyway, shouldn't bandwidth 128 command allow one remote site to connect to main site using max 2 B-channels?
This is the dialer on the remote site that handles the connection with the main site.
interface Dialer99
ip address
encapsulation ppp
dialer pool 1
dialer remote-name myremote
dialer idle-timeout 30
dialer string 0XXXXXXXXX
dialer string 0YYYYYYYYY
dialer caller XXXXXXXXX callback
dialer caller YYYYYYYYY callback
dialer-group 1
no cdp enable
ppp authentication chap
ppp multilink
The dialer string 0YYYYYYYYY means that the dialer string has a leading zero, as per italian numbering plan, while the called id has not. This is the reason why dialer string has a leading zero and dialer caller doesn't.
Ciao