Troubleshooting
Symptom 1
DCC dialup connection cannot be set up because the modem does not dial when the router forwards data.
Solution
Check that:
The modem and phone cable connections are correct, and the modem initialization process is correct.
The dialup interface, if it is synchronous/asynchronous, is set to operate in asynchronous protocol mode.
DCC is enabled on the dialup interface.
A dialer route or dialer number command is available for the packets.
Symptom 2
The remote end cannot be pinged after the modem is connected.
Solution
Check that:
The same link layer encapsulation is used at the two ends, and correct PPP parameters are configured for authentication. Use the debugging ppp all command to verify that.
A correct IP address is assigned to the dialup interface (physical or dialer interface).
DCC is enabled on the dialup interface.
The correct dialer-group and dialer-rule commands are configured and associated to make sure that the packets can pass.
Use the debugging dialer event and debugging dialer packet commands to locate the problem.