Re: Failed to establish ISDN call

chris.lau · ‎06-17-2006

I have a router connected to the remote ISDN router via ISDN BRI line

But, the ISDN failed to establish the ip connection. I have the following error message, when I issue the "isdn test call int bri2/5 <number>

Jun 17 12:23:41.990: ISDN BR2/5 EVENT: UserIdle: callid 0x9E56 received ISDN_CALL (0x0)

Jun 17 12:23:49.990: ISDN BR2/5 EVENT: process_rxstate: ces/callid 1/0x9E56 calltype 1 HOST_DISCONNECT_ACK

Jun 17 12:23:49.990: ISDN BR2/5 **ERROR**: host_disconnect_ack: Unfound B-channel on Disconnect_Ack call id 0x9E56

Jun 17 12:24:11.988: ISDN BR2/5 EVENT: UserIdle: callid 0x9E56 received ISDN_HANGUP (0x1)

Jun 17 12:24:11.988: ISDN BR2/5 **ERROR**: CCBRI_Go: NO CCB Src->HOST call id 0x9E56, event 0x5 ces 1

Jun 17 12:24:11.988: ISDN BR2/5 EVENT: process_rxstate: ces/callid 1/0x9E56 calltype 1 HOST_QUERY_RESPONSE

Jun 17 12:39:51.836: ISDN BR2/5 **ERROR**: host_disconnect_ack: Unfound B-channel on Disconnect_Ack call id 0x9E57

Jun 17 12:40:13.837: ISDN BR2/5 **ERROR**: CCBRI_Go: NO CCB Src->HOST call id 0x9E57, event 0x5 ces 1

globalnettech · ‎06-17-2006

Hello,

can you post the configs of both routers ?

Regards,

GNT

chris.lau · ‎06-17-2006

Router 1

________

interface BRI2/5

bandwidth 64

ip address 203.1.1.1 255.255.255.252

encapsulation ppp

dialer idle-timeout 180

dialer map ip 203.1.1.2 name CHNDGMP001 018503654

dialer-group 1

isdn switch-type basic-net3

isdn point-to-point-setup

isdn caller 018503654

no cdp enable

ppp authentication chap

ppp chap hostname CHBARMP001

Router 2

________

interface BRI0

description NDGBARL01-1;LINK TO CHBARMP003 B2/5

ip address 203.1.1.2 255.255.255.252

encapsulation ppp

dialer idle-timeout 180

dialer map ip 203.1.1.1 name CHBARMP001

dialer-group 1

isdn switch-type basic-net3

isdn caller 0417630020

ppp authentication chap

chris.lau · ‎06-17-2006

Router 1

________

interface BRI2/5

bandwidth 64

ip address 203.1.1.1 255.255.255.252

encapsulation ppp

dialer idle-timeout 180

dialer map ip 203.1.1.2 name CHNDGMP001 018503654

dialer-group 1

isdn switch-type basic-net3

isdn point-to-point-setup

isdn caller 018503654

no cdp enable

ppp authentication chap

ppp chap hostname CHBARMP001

Router 2

________

interface BRI0

description NDGBARL01-1;LINK TO CHBARMP003 B2/5

ip address 203.1.1.2 255.255.255.252

encapsulation ppp

dialer idle-timeout 180

dialer map ip 203.1.1.1 name CHBARMP001

dialer-group 1

isdn switch-type basic-net3

isdn caller 0417630020

ppp authentication chap

Richard Burts · ‎06-17-2006

Chris

I am not sure what caused the error. Would you post the output of show isdn status? It might also be helpful if your would run debug isdn q931, try the test again, and post any output produced by debug.

HTH

Rick

HTH

Rick

chris.lau · ‎06-17-2006

The output for show isdn sta bri2/5

ISDN BRI2/5 interface

dsl 21, interface ISDN Switchtype = basic-net3

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 76, Ces = 1, SAPI = 0, State = TEI_ASSIGNED

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 21 CCBs = 0

The Free Channel Mask: 0x80000003

Total Allocated ISDN CCBs = 0

globalnettech · ‎06-17-2006

Hello,

make sure that you do not disconnect your sessions with the 'clear interface' command, but use the 'isdn test disconnect' instead, since 'clear interface' causes certain ISDN switches to not properly disconnect sessions.

Also, with your current config, only your Router 1 can call your Router 2, is this what you want ?

Make sure that your the CHAP hostnames match on both sides (they are case sensitive).

Try and modify your config as following:

Router 1

________

interface BRI2/5

bandwidth 64

ip address 203.1.1.1 255.255.255.252

encapsulation ppp

dialer idle-timeout 180

--> dialer map ip 203.1.1.2 name CHNDGMP001 broadcast 018503654

dialer-group 1

isdn switch-type basic-net3

isdn point-to-point-setup

isdn caller 018503654

no cdp enable

ppp authentication chap

ppp chap hostname CHBARMP001

Router 2

________

interface BRI0

description NDGBARL01-1;LINK TO CHBARMP003 B2/5

ip address 203.1.1.2 255.255.255.252

encapsulation ppp

dialer idle-timeout 180

dialer map ip 203.1.1.1 name CHBARMP001

dialer-group 1

isdn switch-type basic-net3

isdn caller 0417630020

ppp authentication chap

Regards,

GNT

Richard Burts · ‎06-17-2006

Chris

Thanks for posting the output of show isdn status. The output looks normal and seems to show a connection ready to work.

Is the ISDN the primary connection to the other router or is the ISDN perhaps a backup connection? (If some interface is configured with backup interface bri2/5 then that puts the BRI interface into a state where it can not initiate a call unless the primary link is not available)

Given what you have shown us I believe that the output of debug isdn q931 would be quite helpful.

HTH

Rick

HTH

Rick

globalnettech · ‎06-17-2006

Hello Chris,

just one more thought: what country are you in ? Some providers still have older type ISDN switches in use that support only 56K speed connections. Try and add the following to your config:

dialer map ip 203.1.1.2 name CHNDGMP001 speed 56 broadcast 018503654

Regards,

GNT