Cisco 1720 Hardware Installation Manual page 60

Table 3-4 Troubleshooting ISDN (Continued)
WAN Interface
Card Symptom(s)
ISDN S/T Card cannot
or make a
ISDN U connection to the
remote router.
Cisco 1700 Router Hardware Installation Guide
3-12
Check the Following
Use show isdn status
command to check the
following:
• Does the current ISDN
switch type match actual
switch type being used?
• 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"?
Chapter 3
Possible Causes
• Use the isdn switch-type command to
configure correct switch type.
• 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 or the
dialer string command.
• Check destination phone number and
make sure it matches the remote router
phone number. Check route to the
destination and make sure it matches
the remote router network address.
• Check router protocol configurations.
Troubleshooting
78-5405-03