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ISDN lan-to-lan connection

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Dear colleague,
i've a great problem to solve quickly...
I've to define a lan-to-lan connection with a bri interface over an
isdn channel. I have to use a Cisco 800 with a bri and a ethernet and
a Zyxel LH100.
The config of Cisco is the one below:
Current configuration : 1286 bytes
! Last configuration change at 12:23:36 UTC Fri Feb 27 2004
! NVRAM config last updated at 12:24:26 UTC Fri Feb 27 2004
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
hostname xxxxxxx
boot system flash nvram
boot config flash:nvram
enable secret 5 $1$PKrg$iV7aPbpm86OvZ/LpfpujB.
username xxxxxx password 7 0203055C07034F271D
username xxxxxxxxx password 7 130C191C041A05
ip subnet-zero
isdn switch-type basic-net3
interface Ethernet0
ip address
interface BRI0
description Incoming calls to remote supply
ip address
encapsulation ppp
dialer idle-timeout 300
dialer map ip name xxxxxxxx broadcast xxxxxxxxx
dialer-group 1
isdn switch-type basic-net3
ppp authentication chap
ppp chap hostname xxxxxxxxxx
ppp chap password 7 09454007161316
router rip
no ip http server
no ip classless
ip route
dialer-list 1 protocol ip permit
banner login ^C User access non authorized is forbidden!^C
line con 0
exec-timeout 0 0
login local
line vty 0 4
exec-timeout 0 0
login local
no rcapi server

The zyxel is configured as an lan-to-lan router with a wan address and
a remote peer address corrisponding with Cisco one.
On between routers it's active rip router ver-1.
On zyxel it's set this static rule:

Results: I can open the isdn channel and see the cisco 800 remote
router but i can't ping anymore interface on remote lan. there aren't
any firewalls or other secure policy active on anyone of this two
Any help will be greatly appreciated.
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