[SIPForum-discussion] reINVITE sent by callee before receiving ACK

[tester voip]

hi,
as per the rule re-invite is sent by either party when the dialog is
estabnlished.
here the caled party sends before receiving ack i.e dialog not established.

although alice wont reject it as it has sent the ack already.
alice sends 200ok for it.

please corect me if m wrong.


On Tue, Dec 17, 2013 at 7:58 PM, Talha Koc <talha.koc at huawei.com> wrote:

>  Hi all,
>
>
>
> I would like to get your opinions about the race condition shown below.
>
> In this scenario, Bob sends a re-INVITE with a new offer before receiving
> the ACK for the offer 1.
>
>
>
> Does this violate the offer/answer model? What is the correct behavior for
> Alice here in this position?
>
> Should Alice accept the offer and respond with 200OK with offer2, or
> should Alice reject it based on the following rule?
>
>
>
> RFC 6337 2.2:
>
> “There may be ONLY ONE offer/answer negotiation in progress for a
>
>    single dialog at any point in time.”
>
>
>
>
>
>         Alice                             Bob
>
>           |                                |
>
>           |        INVITE w/offer1         |
>
>           |------------------------------->|
>
>           |             180                |
>
>           |<-------------------------------|
>
>           |                                |
>
>           |      200 INVITE w/answer1      |
>
>           |<-------------------------------|
>
>           |                    reINVITE    |
>
>           |   ACK              w/offer2    |
>
>           |-------------     --------------|
>
>           |              \ /               |
>
>           |               X                |
>
>           |              / \               |
>
>           |<------------     ------------->|
>
>           |             ???                |
>
>           |------------------------------->|
>
>           |                                |
>
>
>
> *Note: I checked RFC 5407 3.1.4 for a similar scenario, but in that case
> reINVITE is sent by the caller, not callee.*
>
> *Note2: This is my first post in the mailing list.*
>
>
>
> Regards,
>
> Talha
>
>
>
>
>
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