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Intermittent isdn failure on Cisco 1700

Hi, I have a really weird isdn issue. My isdn serves as backup to the primary leased line. It is only activated when the leased line fails. However, recent tests have indicated that the isdn doesn't always work. It always dialls the same number. I have replaced the card, router, local rj45, tried dialling into a different number to no avail. The isdn does work intermittently (I have a working debug showing a good isdn call if you want). The debug from a failed ISDN is attached. Also, please note that at no stage do I loose connectivity to the local isdn switch.

RouterA#ping 10.0.0.6

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.0.0.6, timeout is 2 seconds:

.May 13 09:33:34 UTC: BR0 DDR: rotor dialout [best] least recent failure is also most recent failure

.May 13 09:33:34 UTC: BR0 DDR: rotor dialout [best] also has most recent failure

.May 13 09:33:34 UTC: BR0 DDR: rotor dialout [best]

.May 13 09:33:34 UTC: BR0 DDR: place call

.May 13 09:33:34 UTC: BR0 DDR: Dialing cause ip (s=10.0.0.5, d=10.0.0.6)

.May 13 09:33:34 UTC: BR0 DDR: Attempting to dial 00441737826576

.May 13 09:33:34 UTC: ISDN BR0 EVENT: UserIdle: callid 0x80A8 received ISDN_CALL (0x0)

.May 13 09:33:34 UTC: ISDN BR0 EVENT: process_bri_call: call id 0x80A8, called_number 00441737826576, Guid 0004E0880000 speed 64, call type DATA, bchan -1 clng_num none....

.May 13 09:33:42 UTC: ISDN BR0 EVENT: process_rxstate: ces/callid 1/0x80A8 calltype 1 HOST_DISCONNECT_ACK

.May 13 09:33:42 UTC: ISDN BR0 **ERROR**: host_disconnect_ack: Unfound B-channel on Disconnect_Ack call id 0x80A8.

Success rate is 0 percent (0/5)

.May 13 09:34:04 UTC: BRI0: wait for isdn carrier timeout, call id=0x80A8

.May 13 09:34:04 UTC: DDR: Dialing failed, 5 packets unqueued and discarded

.May 13 09:34:04 UTC: ISDN BR0 EVENT: UserIdle: callid 0x80A8 received ISDN_HANGUP (0x1)

.May 13 09:34:04 UTC: ISDN BR0 **ERROR**: CCBRI_Go: NO CCB Src->HOST call id 0x80A8, event 0x5 ces 1

.May 13 09:34:04 UTC: ISDN BR0 EVENT: process_rxstate: ces/callid 1/0x80A8 calltype 1 HOST_QUERY_RESPONSE

Any ideas?

Regards

mary

2 REPLIES
Hall of Fame Super Silver

Re: Intermittent isdn failure on Cisco 1700

Mary

In addition to the output of debug dialer it would be helpful to see the output of debug isdn q931 when attempting to place the call.

HTH

Rick

New Member

Re: Intermittent isdn failure on Cisco 1700

The above output includes the debug isdn q931, debug isdn q921 and debug ppp negotiation. This is all I get for the ISDN when it fails.

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