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New Member

ISDN Call out issue on Cisco 876


I am trying to configure a cisco 876 (adsl with isdn backup router). I only want to use the isdn interface on the router as I am using a seperate adsl router and intend setting up hsrp between them so I dont have a single point of failure.

anyway when I try to initiate a call on the router I get the following error

*Mar 2 00:47:07.638: ISDN BR0 **ERROR**: process_bri_call: Outgoing call id 0x8

011 blocked

does anyone know why I get this? Here is a sh ver


Cisco IOS Software, C870 Software (C870-ADVSECURITYK9-M), Version 12.4(4)T8, REL


Technical Support:

Copyright (c) 1986-2007 by Cisco Systems, Inc.

Compiled Sat 11-Aug-07 03:34 by khuie

ROM: System Bootstrap, Version 12.3(8r)YI4, RELEASE SOFTWARE

ISDNBACKUP uptime is 23 hours, 53 minutes

System returned to ROM by power-on

System image file is "flash:c870-advsecurityk9-mz.124-4.T8.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

Cisco 876 (MPC8272) processor (revision 0x200) with 118784K/12288K bytes of memo


Processor board ID FCZ1205121G

MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10

4 FastEthernet interfaces

1 ISDN Basic Rate interface

1 ATM interface

128K bytes of non-volatile configuration memory.

24576K bytes of processor board System flash (Intel Strataflash)

Configuration register is 0x2102


Re: ISDN Call out issue on Cisco 876

This is usually seen when the isdn switch has no route for the outgoing call which is others issue.


Re: ISDN Call out issue on Cisco 876

Post all pertinent configs...


New Member

Re: ISDN Call out issue on Cisco 876

Guys I believe its the IOS. you need to have enterprise version to be able to dial out which is completly ridiculous. who in their right mind is going to just buy a router with bri port just to hang a modem off it for out of band management especially seen as its a router aimed at a soho.

good going cisco

New Member

Re: ISDN Call out issue on Cisco 876

Even I could see the same ISDN errors in 876 router. ISDN L1 and L2 are active, but ISDN calls are not going through.

We tried to connect this ISDN link to another router and used the same configurations. It was working fine.

I think there is an issue with IOS (Adv IP services and Adv Security).

Try to upgrade the IOS to Adv Enterprise service Feature set.

New Member

Re: ISDN Call out issue on Cisco 876

I did and it resolved the issue. all other version of IOS for these routers only support calls in and not calls out