[asterisk-users] Getting SIP Response Code from HANGUPCAUSE

[Raj Jain]

> > http://www.faqs.org/rfcs/rfc3398.html
>
> The conversion is "lossy". More than 1 SIP cause code is 
> mapped to a Q.931 cause code (in Asterisk at least). See
> hangup_sip2cause() in chan_sip.c

True. The conversion is lossy in that respect and most of the times
semantically incorrect simply because of the fundamental differences between
SIP and ISUP. In fact, many new SIP response codes have been defined and
will be defined in the future since RFC 3398 was written
(http://www.iana.org/assignments/sip-parameters). And as far as I can tell a
revision of RFC 3398 is not in works in the IETF. 

- Raj 
 

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com 
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
> Philipp Kempgen
> Sent: Friday, October 26, 2007 11:37 AM
> To: Asterisk Users
> Subject: Re: [asterisk-users] Getting SIP Response Code from 
> HANGUPCAUSE
> 
> Eric "ManxPower" Wieling wrote:
> 
> >> On 10/25/07, Douglas Garstang <dougmig33 at yahoo.com> wrote:
> >>> I'd like to grab the SIP response code that comes back from an 
> >>> INVITE. The HANGUPCAUSE gives the converted ISDN cause 
> code. Anyone 
> >>> know of a way to get the SIP response code instead?
> > 
> > There is an RFC for this.  I don't know if Asterisk follows 
> the RFC or not.
> > 
> > http://www.faqs.org/rfcs/rfc3398.html
> 
> The conversion is "lossy". More than 1 SIP cause code is 
> mapped to a Q.931 cause code (in Asterisk at least). See
> hangup_sip2cause() in chan_sip.c
> 
> Regards,
>   Philipp Kempgen
> 
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