[Serusers] NAT contat rewrite

Linus Surguy linus at magrathea-telecom.co.uk
Sun Jul 18 19:00:50 CEST 2004


> On Jul 18, 2004 at 11:22, Linus Surguy <linus at magrathea-telecom.co.uk>
wrote:
> > > Contacts are used to advertised wherebouts for subsequent in-dialog
> > > requests coming back to your UAC. For that reason, I don't entirely
> > > understand why the UAC includes Contact in CANCEL at all -- all in all
> > > CANCEL is used to discontinued estabslishment of a dialog. Anyhow,
> > > it should not matter the Contact content is invalid since there is no
> > > use for the header field in this case at all.
> >
> > Sorry, just realised that in a half-awake state I typed rubbish. I meant
> > that the 'call-id' was not rewritten - don't know why I mentioned
contact!
> > (In the INVITE to the Cisco it is blah at 213.x.x.x and in the CANCEL to
Cisco
> > it is blah at 10.x.x.x
>
> Then it's even stranger. ser/nathelper doesn't re-write the callid.
> Maybe you have a nat box on the way, which is trying to be smart and fix
> sip messages.

Oh great! This means that this is another broken 'feature' in the Draytek
Vigor 2600 ADSL router.

Linus




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