ISDN PRI issues (Spain)

Unanswered Question
Mar 23rd, 2009

I'm having a hard time configuring an IDSN E1 PRI in our 2811 router.

I followed all the cisco configuration guides, tips, forums, etc, and nothing.

I think is something related with the isdn switch-type, framing, or something with the controller configuration. Remember this setup is for Spain.

This is what I've got so far:

card type E1 0 3

isdn switch-type primary-net5

network-clock-participate wic 3

network-clock-select 1 E1 0/3/0

voice-card 0

dspfarm

no local-bypass

controller e1 0/3/0

framing no-crc4

pri-group timeslots 1-8

linecode hdb3

interface Serial0/3/0:15

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable

voice-port 0/3/0:15

dial-peer voice 1 pots

description PRIMARIO

destination-pattern .T

incoming called-number 902333302

direct-inward-dial

port 0/3/0:15

Any help is appreciated! I'm really stuck on this.

I have this problem too.
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Brandon Buffin Mon, 03/23/2009 - 13:49

Can you post the results of "show isdn status"? It appears this is a fractional PRI and that you're using 8 channels. Does this configuration match the carriers config?

Brandon

Nicholas Matthews Mon, 03/23/2009 - 20:20

Fairly generic problem description.

Generic troubleshooting steps:

'sh controller t1' - is it up? If not, physical problem.

'show isdn status' - is it multiple frame established? If not, 'debug isdn q921' and possibly check switch type. There can be some local variant (especially with BRI) for getting layer 2 up.

'debug isdn q931' for a failed call if your layer 2 is up. This will show if your dial plan or dial peers are configured correctly.

hth,

nick

jacampanini Tue, 03/24/2009 - 00:27

Router#show

*Mar 24 07:21:44.407: %SYS-5-CONFIG_I: Configured from console by consoleisdn st

at

Global ISDN Switchtype = primary-5ess

ISDN Serial0/3/0:15 interface

dsl 0, interface ISDN Switchtype = primary-net5

Layer 1 Status:

DEACTIVATED

Layer 2 Status:

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

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x00000000

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

Total Allocated ISDN CCBs = 0

Router#

Router#show controllers e1

E1 0/3/0 is down.

Applique type is Channelized E1 - balanced

Cablelength is Unknown

Transmitter is sending remote alarm.

Receiver has loss of signal.

alarm-trigger is not set

Version info Firmware: 20071011, FPGA: 13, spm_count = 0

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

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (847 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

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

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 847 Unavail Secs

Router#

I read a bit in internet, it appears to be a problem that my configuration is not matching the telco parameters? am I right?

Thanks again for the help!

Nicholas Matthews Tue, 03/24/2009 - 04:32

Your T1 is down. Make sure 3 things are right:

clock source matches provider

line code matches provider

framing matches provider

If this is back-to-back between routers you need a T1/E1 crossover cable.

If this is to a smartjack, it should be a straight through cable.

hth,

nick

jacampanini Wed, 03/25/2009 - 07:49

Good afternoon, thanks for all the replies! I still need help.

We talk to our provider and we have the "correct" paremeters, but we still can't work this out.

Router#show isdn stat

Global ISDN Switchtype = primary-net5

ISDN Serial0/3/0:15 interface

dsl 0, interface ISDN Switchtype = primary-net5

Layer 1 Status:

DEACTIVATED

Layer 2 Status:

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

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x00000000

Number of L2 Discards = 0, L2 Session ID = 1

Total Allocated ISDN CCBs = 0

We tried everything, and I'm sure we're stuck on some detail we can't see. Our provider is not helping much, either.

Any more ideas? Thanks.

Nicholas Matthews Wed, 03/25/2009 - 08:29

This is wiring or layer 1.

Layer 1 Status:

DEACTIVATED

No amount of ISDN configuration is going to help you now.

-nick

jacampanini Wed, 03/25/2009 - 08:35

yes, sadly, I know.

The problem is, with our "old" pbx, it works. I'm only unplugging the jack on the "old" one, and plug in in the Cisco WIC. So (maybe) is not a cabling/jack/crossover cable issue.

Nicholas Matthews Wed, 03/25/2009 - 10:45

The main thing to be aware of is that back-to-back requires a T1 cross over, but if you're connecting to a smartjack or an ISDN switch, it may be a straight through.

(This could be vice versa for your situation). Pins 1+4 and 2+5 are switched in the crossover scenario.

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