isdn\bri not showing as spoofing

Unanswered Question
Apr 29th, 2008


We have have a Cisco 2800 with CCME with 2 ISDN Bri for PSTN connection

How can i get an isdn line to show as spoofed?

Currently always showing

sh ip int brief

BRI0/0/0 unassigned YES NVRAM down down

sh int

BRI0/0/0 is down, line protocol is down

I would this to spoof connection so as alway up up.

We sometime don't get an outside line and I think this is the issue

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Paolo Bevilacqua Wed, 04/30/2008 - 13:07

Which exact IOS are you running? Some have bugs in ISDN and need to be upgraded. That has nothing to do with the "spoof" state or lack of it.

shovels3 Thu, 05/01/2008 - 00:01

IOS is Version 12.4(9)T7, RELEASE SOFTWARE (fc3)

I have dial peers on this which are showing as down in the Status therefore when I try to get an outside line

Before call in bound (No Outside Line)

#sh dial-peer voice sum

1 pots up up 999 7 down 0/0/0

2 pots up up 9T 1 down 0/0/0

3 pots up up 0 down 0/0/0

If I place a call in bound I then see the dial-peer as up. This is causing my outside line problem.

I need these to show as up up

After call in bound (I can now get an Outside Line)

#sh dial-peer voice sum

1 pots up up 999 7 up 0/0/0

2 pots up up 9T 1 up 0/0/0

3 pots up up 0 up 0/0/0

Is there a way to ensure that these line stay in an up state

BRI line are configured as below

interface BRI0/0/0

no ip address

isdn switch-type basic-net3

isdn overlap-receiving

isdn point-to-point-setup

isdn incoming-voice voice

isdn sending-complete

isdn outgoing ie progress-indicator

isdn outgoing display-ie

no isdn outgoing ie caller-subaddr

isdn outgoing ie called-number

no isdn outgoing ie called-subaddr

isdn static-tei 0

trunk-group isdn

Paolo Bevilacqua Thu, 05/01/2008 - 06:14

Hi, it is normal that BRI interfaces go down after a timeout and you cannot do anything about it.

So, you need to configure in global mode:

no dial-peer outbound status-check pots

Hope this helps, please rate post if it does!

shovels3 Thu, 05/01/2008 - 06:24

We have just applied this command this morning and it seems to be resolving the issue.

shovels3 Fri, 05/02/2008 - 04:06


Just wanted to check it now take up to 10sec for the call to connect via ISDN.

Is there any way of speeding this call connection up?

I have a single peer with 9T

would I have to configure peers for local, international, mobile, numbers

Is this the only way


Paolo Bevilacqua Fri, 05/02/2008 - 07:05

Set the timeout value under telephony-service, not voice-port. Usually a good value is 4.

As someone else also suggested, the best approach if to explicitly configure all the patterns that are of fixed length to not have T, just as many dots a necessary.

Hope this helps, please rate post if it does!

mlitka Fri, 05/02/2008 - 05:29

Yes. You would need to configure more specific dial peers to get around the interdigit timeout. I would focus on frequently dialed numbers like local, mobile and long distance. International will usually just hit the 9T pattern unless you want to implement (CoR) class of restrictions.


This Discussion