System information

Troubleshooting Dialin Connections 16-351
Dialin: Modem Does Not Dial
Modem hardware
problem
Check the modem’s physical connection. Make sure the modem is on and is connected
securely to the correct port. Make sure the transmit and receive indicator lights flash
when the chat script is running.
No interesting packets
defined
Step 1 Use the show running-config privileged exec command to view the router
configuration. Check the dialer-list interface configuration command entries
to see which access lists, if any, are being used to define interesting traffic.
Step 2 Make sure the access lists referenced by the dialer-list commands specify all
traffic that should bring up the link (interesting traffic).
Step 3 If necessary, modify the access list commands so that they define the proper
traffic as interesting.
Missing chat script Step 1 Use the debug chat privileged exec command to check whether there is a chat
script running.
Step 2 If there is no chat script running, use the start-chat privileged exec command
or another appropriate command to start the chat script on the line.
For detailed information about creating and configuring chat scripts, refer to the
Cisco IOS Access Services Configuration Guide and Access Services Command
Reference.
Bad chat script
Step 1 Establish a reverse Telnet session to the modem and step through each step of
the chat script.
Step 2 Verify that the command response to each chat script step is correct.
Step 3 Fix any inconsistencies you find in the chat script.
For detailed information about creating and configuring chat scripts, refer to the
Cisco IOS Access Services Configuration Guide and Access Services Command
Reference.
1 DTE = data terminal equipment
Possible Causes Suggested Actions