Cisco Systems 1700 manual Troubleshooting Isdn, Use show isdn status

Chapter 3 Troubleshooting

Table 3-4	Troubleshooting ISDN (Continued)
WAN Interface
Card	Symptom(s)	Check the Following	Possible Causes
ISDN S/T	Card cannot	Use show isdn status
or	make a	command to check the
ISDN U	connection to the	following:
	remote router.	• Does the current ISDN	• Use the isdn switch-typecommand to
		switch type match actual	configure correct switch type.
		switch type being used?

•Is Layer 1 status deactivated?

•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.

•If Layer 1 status is active, does Layer 3 status say “2 Active Layer 3 calls”?

•Router might have called itself. Check destination phone number configured with the dialer map command or the dialer string command.

• If Layer 1 status is active,	• Check destination phone number and
does Layer 3 status say	make sure it matches the remote router
“No Active Layer 3	phone number. Check route to the
call(s)”?	destination and make sure it matches
	the remote router network address.
• If Layer 1 status is active,	• Check router protocol configurations.
does Layer 3 status say “1
Active Layer 3 call”?

	Cisco 1700 Router Hardware Installation Guide
3-12	78-5405-03