[Serusers] Warning header mandatory ?

[Andrei Pelinescu-Onciul]

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).

Andrei