Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
Community Member

Cisco 819G 3G Problem


We have a Problem with a 819G Router 4G (LTE) connection is working but if it fails 3G connection cannot be established.

here is my configuration:


Profile 1 = INACTIVE*
PDP Type = IPv4
Access Point Name (APN) =
Authentication = PAP
Username: t-mobile
Password: tm

chat-script GSM "" "AT!CALL1" TIMEOUT 20

interface Cellular0
 ip address negotiated
 ip nat outside
 ip virtual-reassembly in
 encapsulation slip
 dialer in-band
 dialer idle-timeout 4800
 dialer string GSM
 dialer-group 1
 no peer default ip address
 async mode interactive

ip nat inside source list NAT interface Cellular0 overload
ip route Cellular0

line 3
 script dialer GSM
 modem InOut
 no exec
 transport input all
 transport output all



a short log

*Jun  3 12:49:21.707: Ce0 DDR: place call
*Jun  3 12:49:21.707: Ce0 DDR: Dialing cause ip (s=, d=
*Jun  3 12:49:21.707: Ce0 DDR: Attempting to dial GSM
*Jun  3 12:49:21.707: CHAT3: Attempting async line dialer script
*Jun  3 12:49:21.707: CHAT3: Dialing using Modem script: GSM & System script: none
*Jun  3 12:49:21.707: CHAT3: process started
*Jun  3 12:49:21.707: CHAT3: Asserting DTR
*Jun  3 12:49:21.707: CHAT3: Chat script GSM started
*Jun  3 12:49:21.707: CHAT3: Chat script GSM finished, status = Success
*Jun  3 12:49:23.487: Ce0 DDR: disconnecting call
*Jun  3 12:49:38.487: Ce0 DDR: re-enable timeout

A strange behaviour is no response on the chat script, so when i configure an expected string t runs ito a timeout





Community Member

 Hello, if someone is


Hello, if someone is interested

the modem hardware has changed and supports not longer PPP enc, so Chat script has to be changed

chat-script gsm "" "AT!SCACT=1" TIMEOUT 60 "OK" (for two SIM cards)



CreatePlease to create content