Cisco 1601 - Router - EN, User Manual

Page: 58 / 88

Cisco 1600 Series Router Hardware Installation Guide
Troubleshooting ISDN
A-10
Cannot make an ISDN connection to remote
device (Cisco 1603, Cisco 1604, ISDN WAN
interface cards). • Use show status command
to check the following:
— Does the current ISDN
switch type match actual
switch type being used?
• Use the isdn switch-type
command to configure
correct switch type.
• Check the following:
— Is Layer 1 status
deactivated?
— If Layer 1 status is
active, does Layer 3
status say “2 Active
Layer 3 calls”?
— If Layer 1 status is
active, does Layer 3
status say “No Active
Layer 3 call(s)”?
— If Layer 1 status is
active, does Layer 3
status say “1 Active
Layer 3 call”?
• Use the show controller
bri0 command to check for
the messages CO
RUNNING LOOPBACK
TESTS or CO TESTING. If
you receive these messages,
contact the service provider.
• Router might have called
itself. Check destination
phone number configured
with the dialer map
command and the dialer
string command.
• Check destination phone
number. Check route to the
destination.
• Check router protocol
configurations.
Figure A-1 Troubleshooting ISDN (Continued)
Symptom Checks Causes and Solutions