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887 VAMG2 cellular problem - only works with dialer persistent


my name is Nelson and I´m from Portugal.

I have a customer that will install several cisco 887 VAMG2 that have a L2TP tunnel through a ADSL conection. The idea is that when the ADSL connection fall the router establish a GSM connection and the tunnel L2TP establish throght GSM.

This seams to work but only with the dialer persistent command. The question is that the client does not have unlimited traffic to GSM network so, the connection could not stay always up.

The same customer already have cisco 1841 with this solution working but with this new routers, only seems to work with dialer persistent.

Any idea ? Urgently


chat-script gsm "" "ATSCACT" TIMEOUT 60 "OK"

interface Cellular0

ip address negotiated

ip virtual-reassembly in

encapsulation slip         - THIS ROUTERS DO NOT SUPPORT PPP

dialer in-band

dialer string gsm

dialer-group 1

async mode interactive

ip route Cellular0

access-list 100 deny   udp any any eq rip

access-list 100 deny   ip any host

dialer-list 1 protocol ip list 100

line 3

script dialer gsm

modem InOut

no exec


With this basic configuration, it seems like the router does not do anything



% Unrecognized host or address, or protocol not running.


I Have the following debug active (but nothing happens):

debug chat

Best regards,


Hall of Fame Super Gold

887 VAMG2 cellular problem - only works with dialer persistent

Update IOS.

If still trouble, contact the TAC.