[OpenSER-Users] The Via Header of CANCEL Message

[Bogdan-Andrei Iancu]

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 
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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