4 Jul
2007
4 Jul
'07
6:52 p.m.
Klaus,
you are right! in stateful mode, the CANCEL is routed hop by hop but not
constructed (at least not by openser) - that is something I have on the
todo list and really want to have in 1.3
regards,
bogdan
Klaus Darilion wrote:
Bogdan-Andrei Iancu wrote:
Klaus,
CANCEL is hop-by-hop only in stateful processing and in this case,
yes, it has only on VIA. But if you have stateless processing, CANCEL is
^^should
but in fact, also when using tm the CANCEL has 2 Via headers:
U 88.198.53.113:6060 -> 83.136.32.160:5060
CANCEL sip:klaus.darilion@nic.at43.at SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:88.198.53.113:6060;lr=on;ftag=d421fe7e>.
Via: SIP/2.0/UDP 88.198.53.113:6060;branch=z9hG4bKdd22.f7f861b6.0.
Via: SIP/2.0/UDP
10.10.0.50:13946;received=83.136.33.3;branch=z9hG4bK-d87543-2e40397a3e383c6b-1--d87543-;rport=13946.
To: ...
...
regards
klaus
end-2-end and it will have multiple VIAs...
Does 3665 obsoletes stateless SIP or it is just not covering it???
regards,
bogdan
Klaus Darilion wrote:
Looks like it is defined clearly and openser is
not 100% standard
conform.
regards
klaus
fancy wrote:
Hi Klaus:
RFC 3665 page 54 line 4:
A CANCEL constructed by a
client MUST have only a single Via header field value matching the
top Via value in the request being cancelled.
and RFC 3665 at page 53:
CANCEL is referred to as a "hop-by-hop" request, since it is
responded to at each stateful proxy hop.
and RFC 3665 at page 21:
Client: A client is any network element that sends SIP requests
and receives SIP responses. Clients may or may not interact
directly with a human user. User agent clients and
proxies are
clients.
So, for my opinion, the role of proxy in this case of RFC 3665
section 3.8 is a client when it sends CANCEL message to Bob.
If I misunderstand any RFC meanings, please correct me.
Thank you very much.
Best Regards,
Fangyu Ling
> fancy wrote:
>
>> According to RFC 3665 section 3.8 and RFC 3261 section 9,
>> there is only one via header in CANCEL message
>> (message F11, F13 at page 72 of RFC 3665).
>>
> Hi!
>
> I could find it in RFC 3665, but not in 3261. Where exactly in RFC
> 3261
> is mentioned that the CANCEL has only 1 Via header?
>
> Further, the example has only one Via header - but I could not
> find any
> definition if this is a MUST or not.
>
>
>> How can I remove the 2nd via header?
>>
> You would have to modify tm module and change the code which
> generates
> the CANCEL message.
>
> regards
> klaus
>
>
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