Marc,
This list is for the discussion related to chartered and potential SIP
Forum Task Groups and development of SIP Forum technical documents. In
future, I suggest you post to the SIP implementors list
([email protected]) with this type of questions, or
consult one of the many books on the topic.
1. Do not reuse Call-IDs. The only time the same Call-ID should appear
in multiple dialogs is due to forking (where those are clearly
related).
2. You can send a 403 to a REFER request
If you do not understand these short answers, please post on SIP
implementors.
thanks,
-rohan
On Sep 14, 2005, at 7:34, Valentin Marc wrote:
Hello,
Could you please help me on the following items:
1 - Call-Id use
I have got a question regarding the use of the Call-Id
header field.
I would like to use the Call-Id header field as a key
to group together different dialogs that happen in the
same context, but out of SIP session.
Is it possible to use the same Call-Id value in
several dialogs that do not lie within a SIP session ?
Or do I have to have a kind of key in the body for
the different requests to do so ?
In other words, are the headers \"To\" and
\"From\" sufficient to differentiate two dialogs:
- that would have the same Call-Id value
- and that are not part of any SIP session
- and that are carried out between the same UA*
Here below is what I am intending to do:
- None session is created through INVITE
- A notification through the use of the request
NOTIFY is sent with a Call-Id=ABC from UA1 to UA2
- then I wish to bring information using the request
message MESSAGE between UA1 and UA2 using the same
Call-Id=ABC.
* UA= User Agent
2 - REFER and NOTIFY
I am specifying a call flow that implies the REFER
method.
I would like to know wether it is possible to perform
processing and checkings on the information received
from the REFER before notifying with the response 100
Trying as describe below:
UA1 UA2
----REFER---->
<--202 Accepted--
<< processing and checking regarding information
provided with the REFER>>
<--NOTIFY 100 Trying --
---OK------->
<< Contacting the third party >>
<--NOTIFY 200--
---OK------->
Or do I have to notify 100 trying immediatly following
the receipt of the response 202 Accepted ? If the case
arises, what mean do I have to inform the distant UA
that the demand of referring is not allowed (in my
opinion I cannot use the response 4xx-6xx that are
rather focusing on SIP protocol error) ?
Thanks a lot for your help
Marc
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