[Asterisk-Dev] Bug report 4783 and RFC 3326: The Reason Header Field for SIP

[Tilghman Lesher]

On Tuesday 02 August 2005 02:42, Mikael Magnusson wrote:
> a new header, "X-asterisk-hangupcause", is introduced in bug report
> #4783 "Adding cleartext hangupcause to BYE and CANCEL" [1].
>
> Wouldn't it make more sense to use the Reason header as defined in
> the standard tracks RFC 3326[2] instead? It explicitly states that
> the reason header is most useful in BYE and CANCEL requests.
>
> Example:
>      Reason: SIP ;cause=600 ;text="Busy Everywhere"

That's great when you have a SIP-only system.  However, how do you
translate between SIP codes and PRI codes?  IAX also used to send around
text hangup causes, which are great when you're running only IAX
clients, but aren't so great when you need to communicate the reason a
call failed back across a PRI.  This is the reason we added PRI hangup
cause codes to the IAX protocol, via an IE.  The same thing applies to
SIP:  we need a way to transmit cause codes, regardless of protocol
translations.

-- 
Tilghman