2811 ISDN **ERROR**: accept_incoming_data: no hdlc available

Unanswered Question
May 1st, 2008


My customer has a 2811 with a vwic2-1mft-e1/t1 configured as fractional and every incoming call es rejected with this error message:

*Apr 29 09:00:44.169: ISDN Se0/0/0:15 **ERROR**: accept_incoming_data: no hdlc available from controller b channel 0, call id 0xB

I attached the show ver, show run, show isdn status and the q931 debug.

The PRI is fractional, the telco provide 10 channels but they have configured 15 channels.

Thanks in advance

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
jorge.rubin Thu, 05/01/2008 - 10:27


Thanks for the advice, can you see what is wrong in the configuration? Or do you know what's the reason about the hdlc error?

The 2811 doesn't has the problem that the 2801 with the slot 0 (that is voice only) and the vwic2-1mft supports the data only.

I only want to configure the e1 as data not voice and data.


Paolo Bevilacqua Thu, 05/01/2008 - 10:42

Hello, as far as I know, support for PRI data on vwic-xx-xx (that is different from leased line data), is only possible with the configuration described in the document I've linked.

To confirm the above, you can verify that there are NO references to PRI data support in the data sheet for the VWIC-xx-xx, in fact the preferential hardware to use for PRI data only on the ISR routers, is either the NM-xCE1/T1-PRI, or the new HWIC-xCE1/T1-PRI.

Hope this helps, please rate post if it does!

jorge.rubin Fri, 05/02/2008 - 01:33


Thanks again, I'll check it next friday using that document and let you know about it.


jorge.rubin Fri, 05/02/2008 - 01:46


The Cisco Website says the VWIC2 supports data, I find similar problems with HDLC errors and some of them are solve using tdm clock command to support both (data and voice).

Thanks in advance

Sushil Kumar Katre Fri, 05/02/2008 - 03:57

Hi Jorge,

First I would like to know whether you want to use this connectivity for Voice or Data.

From the configuration you have configured the controller with pri-group command which is used to configure voice channels. However the error message states that it's nto able to accept data.

If you are usng this link for data connectivity use channel-group 1 timeslots 1-16 command instead of pri-group.

If you want to use this link for both voice and data then, follow the link posted by paolo.

-> Sushil

jorge.rubin Fri, 05/02/2008 - 05:10


My customer configured and they only need it for data, I'll reconfigured next friday and let you know what happen.

The thing is the message looks like there is no channels available, I'll check with the Telco to know which channels they activate at the PRI (is no the first time I have problems with fractionnal PRI).

I will like to know the IOS version used if any of you have a 2811 and vwic2 configured for data.


Paolo Bevilacqua Fri, 05/02/2008 - 07:19

Hi, remember that what you are doing is not "data", is "ISD PRI data". that makes a big difference.

You don't have any problem with telco and is not a matter with number of channels, instead is router configuration problem, it needs to be configured as per in the document.


This Discussion