* Linus Surguy linus@magrathea-telecom.co.uk [040718 19:01]:
On Jul 18, 2004 at 11:22, Linus Surguy linus@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@213.x.x.x and in the CANCEL to
Cisco
it is blah@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.
Hey, if you have problems with the draytek router, I know the norwegian importer quite well, Give me a full report, and I'll send him it
- Atle