2800 Multilink Problem

Hello,
We 've got a dial problem with a 2811 branch router (ISDN2) and a 7206 central router (2*ISDN30)
Wehn the 2800 dials in no problem.
When threshold comes up no problem.
But when the second B-channel closed the 2800 doesn't route trafic any more.
Routing protocols still work.
Extended ping from the routers FE interface to de central location form.
But a device connected to the FE interface cannot ping the remote site.
When i use IOS
c2800nm-advsecurityk9-mz.124-10.bin : FAILTY
c2800nm-advsecurityk9-mz.124-12.bin : FAILTY
c2800nm-advsecurityk9-mz.124-5.bin : OKE
c2800nm-advsecurityk9-mz.124-8a.bin : OKE
Branch router:
interface BRI0/2/0
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
isdn tei-negotiation first-call
isdn point-to-point-setup
ppp authentication chap
end
interface Dialer10
ip address 1.1.1.1 255.255.255.252
ip pim sparse-dense-mode
encapsulation ppp
dialer pool 1
dialer string 0123456789
dialer load-threshold 75 either
dialer max-call 2
dialer-group 1
no cdp enable
ppp authentication chap callin
ppp chap hostname somerouter
ppp chap password <REMOVED>
ppp multilink
end
Central router:
interface Dialer1
description ISDN:
bandwidth 128
ip address 1.1.1.2 255.255.255.252
ip pim sparse-dense-mode
encapsulation ppp
ip summary-address eigrp 1 0.0.0.0 0.0.0.0 180
dialer pool 1
dialer remote-name someroute
dialer idle-timeout 180
dialer-group 1
no fair-queue
no cdp enable
ppp authentication chap
ppp multilink
end

Hi
Have you checked up the routes for the remote destinations when the second channel is down ?
Can you check whether you are getting any routes available through the live BRI Channel available when the other one goes down ?
Also can you verify whether the channel is stil active using show isdn active command ?
regds

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