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ISDN Problem


Anyone got any idea what this means?

CCB:callid=80F1, sapi=0, ces=0, B-chan=31, calltype=DATA, hdlctype=HDLC-TRUNK

I have configured ISDN and seem to be getting the above on my layer 3. For ref please see the output from various commands.

# sh isdn status

Global ISDN Switchtype = primary-net5

ISDN Serial1/0:15 interface

dsl 0, interface ISDN Switchtype = primary-net5

Layer 1 Status:


Layer 2 Status:


Layer 3 Status:

0 Active Layer 3 Call(s)

CCB:callid=80F1, sapi=0, ces=0, B-chan=31, calltype=DATA, hdlctype=HDLC-TRUNK

Active dsl 0 CCBs = 1

The Free Channel Mask: 0xBFFF7FFF

Number of L2 Discards = 0, L2 Session ID = 2

Total Allocated ISDN CCBs = 1

sh run

Building configuration...

Current configuration : 3922 bytes

controller E1 1/0

framing NO-CRC4

pri-group timeslots 1-31


interface Serial1/0:15

description local ISDN number tba

no ip address

ip access-group 143 in

encapsulation ppp

dialer pool-member 1

isdn switch-type primary-net5

no cdp enable

ppp authentication chap


interface Dialer1

ip address x.x.x.x x.x.x.x

ip access-group 143 in

encapsulation ppp

dialer pool 1

dialer remote-name xxxxxxxx

dialer string xxxxxxxx

dialer load-threshold 128 outbound

dialer watch-group 1

dialer-group 1

no cdp enable

ppp authentication chap

ppp chap hostname xxxxxxxxx

ppp multilink


sh int s1/0:15

Serial1/0:15 is up, line protocol is up (spoofing)

Hardware is DSX1

Description: local ISDN number tba

MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,

reliability 255/255, txload 19/255, rxload 7/255

Encapsulation PPP, loopback not set

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters 00:11:40

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 4

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/1/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 48 kilobits/sec

5 minute input rate 2000 bits/sec, 37 packets/sec

5 minute output rate 5000 bits/sec, 37 packets/sec

21791 packets input, 185161 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

21801 packets output, 392172 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

1 carrier transitions


sh controllers e1 1/0

E1 1/0 is up.

Applique type is Channelized E1 - balanced

No alarms detected.

alarm-trigger is not set

Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.

Data in current interval (872 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 1 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

0 Errored Secs, 0 Bursty Err Secs, 1 Severely Err Secs, 0 Unavail Secs


Any bit of information will be great help.

Thank you in advance.




Re: ISDN Problem

As such from the show isdn status , your line is not have no problem , its explains caller Id , calltype =voice/data, encapsulation=PPP/HDLC, which channel is currehtly is used . If you are interesting to troubleshooting E1 you can use these links

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