[Serusers] Warning header mandatory ?

[Nils Ohlmeier]

On Tuesday 19 October 2004 15:49, Andrei Pelinescu-Onciul wrote:
> On Oct 19, 2004 at 15:28, Leon de Rooij <leon at scarlet-internet.nl> wrote:
> > Hi,
> >
> > I have a Comtrend SIP UA here and it breaks when I have
> > 'sip_warning=yes' in ser.cfg. It doesn't like the warning header to be
> > too long. I couldn't find anywhere in the SIP RFC's whether there is a
> > maximum length to this header.
> > When I set sip_warning to no, the UA works fine, however I think I read
> > somewhere once that this warning header is sometimes mandatory. Can
> > someone confirm or deny that ?
>
> It's not mandatory, it's optional (rfc3261).
>

It is only "mandatory" if you want to be able to make SIP traceroutes (e.g. 
with sipsak). Allthough for that feature it would only be necessary in 
responses on OPTIONS requests or generally in 483 responses :-)

  Nils