[asterisk-ss7] ISUP decoding error

[asterisk at nicox.org]

ISDN User Part
     CIC: 5
     Message type: Confusion (47)
     Cause indicators, see Q.850 (3 bytes length)
         Mandatory Parameter: 18 (Cause indicators)
         Pointer to Parameter: 2
         Parameter length: 3
         Cause indicators (-> Q.850)
         .... 0111 = Cause location: International network (INTL) (7)
         .00. .... = Coding standard: ITU-T standardized coding (0x00)
         1... .... = Extension indicator: last octet
         .110 0011 = Cause indicator: Information element nonexistant or 
not implemented (99)
         1... .... = Extension indicator: last octet
         Information element: Unknown (0x31)
     No optional parameter present (Pointer: 0)


Thats the Confusion-message, so waht does that mean?

Thanks

Nico


On Tue, 16 Jan 2007, Kristian Nielsen wrote:

> asterisk at nicox.org writes:
>
>> I get so much ISUP decoding errors like this:
>>
>>
>>
>> Jan 16 09:51:46 NOTICE[8793]: l4isup.c:4060 l4isup_event: ISUP
>> decoding error, message discarded. (typ=47)
>>
>>
>> Does anybody know what that means?
>
> It seems this is the "Confusion" message in ISUP.
>
> The chan_ss7 module does not implement handling of this message. So the
> message just means that the confusion message has been ignored (maybe it
> should rather be a DEBUG than a NOTICE message?).
>
> Google turned up this for the confusion message:
>
>    CFN is sent in response to any message (other than a confusion
>    message) if the node does not recognize the message or detects a
>    part of the message as being unrecognized.
>
> so apparently the other end is expressing confusion about some message
> sent by chan_ss7.
>
> If you are up to it, it would probably be a good idea to add decoding
> and logging of the confusion message. It takes a single variable-length
> parameter "Cause Indicators" which, if decoded and logged, might
> hopefully provide a bit more explanation about what exactly the other
> end is confused about.
>
> Alternatively, logs from the other end may provide information as to
> what is wrong. It may be as simple as conflicting CIC setup at each end,
> or might be chan_ss7 sending bad messages, or whatever.
>
> - Kristian.
>
> -- 
> Kristian Nielsen, Software Developer
> MySQL AB, Hvidovre, Denmark, www.mysql.com
> Office: +46 18 174 400 ext. 4525
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