[Asterisk-Users] Archive Post ISDN Q.931 disconnect cause codes

[John Todd]

At 8:17 AM -0700 on 4/10/04, TC wrote:
>Keywords
>T1 Q.931  isdn disconnect cause codes itu standard libpri
>
>Dont know if anyone wondered what q.931 cause codes are
>but i wishwe could get these back into the dial plan as a var
>
>Standard Q931 Codes
>
>Decimal Value Hexadecimal Value
>Definition
>
>1 01 Unallocated (unassigned) number.
>This number is not in the routing table or it has no path
>across the ISDN cloud (network).
>1. Check routing table to see it the number is available.
>2. Check to make sure the correct digits were dialed and it is a valid
>number.
[giant list of q.931 causes snipped]

I believe this is available to the dialplan in $HANGUPCAUSE, but in 
crippled form.  It only returns a small sub-set of q.931 return 
codes, and I am uncertain of their exact mapping to q.931:

http://www.voip-info.org/tiki-index.php?page=Asterisk+variable+hangupcause

I would like to see a more extensive list, since within the dialplan 
or AGI there are alternate things I can do with different result 
codes.  This would require a more formal and standardized mapping of 
Q.931 (or ISUP) codes to SIP return codes and vice versa.  A bit of 
rummaging around in my memory banks produces (voila!) an RFC that 
specifies exactly that translation mapping:

http://www.ietf.org/rfc/rfc3398.txt

If someone would like to make a feature request out of this on the 
bugs.digium.com system, feel free.  I'm entirely too swamped right 
now to take on yet another thread of new features to track.

JT