[cisco-voip] debug isdn q931 invalid information element

Mon Feb 1 00:05:23 EST 2010

Type/plan didn't seem to fix, however isdn bchan-number-order ascending
is working, but I also shut/no shut pri at same time. I could always get
calls in, and they initially worked outbound, then stopped. Wondering if
dirty d channel, etc.

Maybe it's not a full PRI? I asked customer to check with telco, but
yeah that error message isn't helpful, and telco initially said it was a
T200 RNR (receiver not ready) timeout at the 5ess which didn't sound
right.

From: Ryan Ratliff [mailto:rratliff at cisco.com] 
Sent: Sunday, January 31, 2010 10:13 PM
To: Jason Aarons (US)
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] debug isdn q931 invalid information element

Either the telco doesn't think you have a full PRI or they think the
last b-channel is down or busy.   I've also seen this from a telco that
didn't like the isdn plan/type that was getting sent.

In either case there are more applicable disconnect causes they could
send.   Try changing the channel order to start at 1 instead of 23 and
see if the same call is successful.

-Ryan

On Jan 30, 2010, at 11:52 AM, Jason Aarons (US) wrote:

12.4.24T2 with CME7.1/H323

SDCVWRT-5204-2#

Jan 30 16:37:55.915: ISDN Se0/0/0:23 Q931: Applying typeplan for sw-type
0x3 is 0x2 0x1, Calling num 2123805999

Jan 30 16:37:55.915: ISDN Se0/0/0:23 Q931: Sending SETUP  callref =
0x00C0 callID = 0x8041 switch = primary-5ess interface = User

Jan 30 16:37:55.915: ISDN Se0/0/0:23 Q931: TX -> SETUP pd = 8  callref =
0x00C0

        Bearer Capability i = 0x8090A2

                Standard = CCITT

                Transfer Capability = Speech

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0xA98397

                Exclusive, Channel 23

        Calling Party Number i = 0x2180, '2123805999'

                Plan:ISDN, Type:National

        Called Party Number i = 0xA1, '9044914588'

                Plan:ISDN, Type:National

Jan 30 16:37:55.979: ISDN Se0/0/0:23 Q931: RX <- RELEASE_COMP pd = 8
callref = 0x80C0

        Cause i = 0x82E418 - Invalid information element contents

dial-peer voice 91904 pots

 destination-pattern 91..........

 incoming called-number .

 direct-inward-dial

 port 0/0/0:23

 forward-digits 10

!

dial-peer voice 4 voip

 destination-pattern 4...

 session target ipv4:10.89.224.1

 incoming called-number .

 codec g711ulaw

Here is what telco is saying....anyone else seen this?

3109:

The switch received a Q.931 SETUP message from the customer premises
equipment (CPE) on a primary rate interface (PRI) D-channel, but the
message contained an invalid channel identification information element
(IE).

2019:

The switch transmitted an information frame and did not receive an
acknowledgement in T200 time units from the far end. The switch
proceeded to poll the far end with a LAPD receiver ready (RR) or
receiver not ready (RNR) frame. The RR or RNR was re-transmitted N200
times (with each RR or RNR retransmitted every T200 time units) and got
no response from the far end. An RR or RNR frame should be the response

Jason Aarons

Consultant

Dimension Data

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