Re: [Sipping] About offeranswer draft:

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On Fri, Apr 16, 2010 at 11:39 AM, OKUMURA Shinji <shinji.okumura@xxxxxxxxxxxx> wrote:
Hi Eric,

Eric wang <eric.wangxr@xxxxxxxxx>
Thu, 15 Apr 2010 17:40:17 +0800
>HI Shinji,
>
>I noticed the chart in your mail showed ,SDP4 and SDP5 both
>exist in reliable response(1xx-rel). In my mind, no matter
>SDP5 is offer or answer, it shouldn't be allowed.

Agree. And I have said the same thing in the original mail.
You have misunderstood my mail.
 
Sorry for that ,I was shocked by your chart:)
 

>     UAC                   UAS
>      | F1  INVITE (SDP1)   |  <-- offer
>      |-------------------->|
>      | F2     1xx (SDP2)   |
>      |<--------------------|
>      | F3     1xx (SDP3)   |
>      |<--------------------|
>      | F4 1xx-rel (SDP4)   |  <-- answer
>      |<--------------------|
>      | F5 1xx-rel (SDP5)   |
>      |<--------------------|
>      | F6    1xxl (SDP6)   |
>      |<--------------------|
>      | F7  2xx INV(SDP7)   |
>      |<--------------------|
>      | F8     ACK          |
>      |-------------------->|
>   (PRACK transactions are not shown)
>
>Shinji:
>    Just you said "different SDPs(compare with the answer) can
>    exist in non-reliable response and final 2xx response".
>
>Eric:
>    I mean different SDPs may appear in non-reliable response,
>    because some SERVER may use 1xx with SDP
>    to play some announcements before foward a call, eg a charge
>    server "HI guy, you have only 5 minute to communicate",
>    or, a redirect server "the call is forwarding"!   If the server
>    want to use reliable response, it must use re-INVITE after
>    the call is established ,for the SERVER cannot send the SDP
>    in final response from UE-B to UE-A.But if the SERVER
>    use non-reliable response, the SERVER may use final response
>    to carry SDP.
>
>    UE-A         SERVER        UE-B
>     | - INVITE -> |            |
>     | <-18x------ |            |
>     |             | -INVITE -> |
>     |             |            |

IMO "SERVER" in your chart is B2BUA.
Because it sends an original 18x not depended on UE-B.
Yes!
 
BR
Eric
 
 
 
This situation is just a fork.

Regards,
Shinji

>BR
>
>Eric
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