[OpenSIPS-Users] reinvite and dialog uniqueness.

[johan]

I realise that I made an error in my drawing.

1. dialog uniqueness

     Alice     calls     Bob

             ->INVITE

                 call-id: 1

                 from: alice at atlanta;tag=1

                 to: bob at boston

             <- 200

                 call-id: 1

                  from: alice at atlanta;tag=1

                  to: bob at boston;tag=2

             -> ACK

                 call-id: 1

                  from: alice at atlanta;tag=1

                  to: bob at boston;tag=2

Bob does a session refresh

             <- INVITE

question in on the from tag and the to tag.

should it be

             <- INVITE

                 callid: 1

                  *from: alice at atlanta;tag=1 to: bob at boston;tag=2*

or

             <- INVITE

                 call-id: 1

                 *to**: alice at atlanta;tag=1 from: bob at boston;tag=2*

or

             are both the same dialog (call-id + the 2 tags) ?


On 2/12/2022 17:34, Ovidiu Sas wrote:
> The tag belongs to the SIP endpoint and does not change.
> Take a look here at an example:
> https://datatracker.ietf.org/doc/html/rfc3665#section-3.7
>
> Regards,
> Ovidiu Sas
>
> On Fri, Dec 2, 2022 at 11:23 AM johan<johan at democon.be>  wrote:
>> 1. dialog uniqueness
>>
>>      Alice     calls     Bob
>>
>>              ->INVITE
>>
>>                  call-id: 1
>>
>>                  from: alice at atlanta;tag=1
>>
>>                  to: bob at boston
>>
>>              <- 200
>>
>>                  call-id: 1
>>
>>                   from: alice at atlanta;tag=1
>>
>>                   to: bob at boston;tag=2
>>
>>              -> ACK
>>
>>                  call-id: 1
>>
>>                   from: alice at atlanta;tag=1
>>
>>                   to: bob at boston;tag=2
>>
>> Bob does a session refresh
>>
>>              <- INVITE
>>
>> question in on the from tag and the to tag.
>>
>> should it be
>>
>>              <- INVITE
>>
>>                  callid: 1
>>
>>                   from: alice at atlanta;tag=1
>>
>>                   to: bob at boston;tag=2
>>
>> or
>>
>>              <- INVITE
>>
>>                  call-id: 1
>>
>>                  from: alice at atlanta;tag=1
>>
>>                   to: bob at boston;tag=2
>>
>> or
>>
>>              are both the same dialog (call-id + the 2 tags) ?
>>
>>
>> 2. reinvite
>>
>> Secondly,
>>
>> when opensips is used as b2bua scenario as below
>>
>>
>> A                         opensips                     B
>>
>>          -> invite                     ->invite
>>
>>          <-200                        <- 200
>>
>>          -> ack                        ->ack
>>
>>          ...                                ....
>>
>>                                             <-reinvite for keeeping session alive.
>>
>> Is there a way that I can let respond opensips 200 OK on the reinvite without forwarding the request to A ?
>>
>> so I want
>>
>> A                         opensips                     B
>>
>>          -> invite                     ->invite
>>
>>          <-200                        <- 200
>>
>>          -> ack                        ->ack
>>
>>          ...                                ....
>>
>>                                             <-reinvite for keeeping session alive.
>>
>>                                             ->200
>>
>>
>> instead of
>>
>> A                         opensips                     B
>>
>>          -> invite                     ->invite
>>
>>          <-200                        <- 200
>>
>>          -> ack                        ->ack
>>
>>          ...                                ....
>>
>>                                             <-reinvite for keeeping session alive.
>>
>>          <- reinvite
>>
>>          -> 200                        ->200
>>
>>
>> wkr,
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at lists.opensips.org
>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>
>
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