[OpenSIPS-Users] Distinction between two forked INVITE received from upstream

[Brett Nemeroff]

This is an interesting question. The requests should have different tags
.I'm not sure how OpenSIPs handles the individual requests..

I'd tend to expect a 491 Request Pending or a 500 Requests Merged. But maybe
that's B2BUA behavior.

Since opensips isn't replying to the "second" INVITE, it's almost like it's
absorbing it as a retransmission. I'm not sure what your expected behavior
is, but it seems that you're going to constantly have race conditions on
this and that the outcome will be "random" (ie: does INVITE(1) hit first, or
INVITE(2))

What's the larger picture here? Why do you have two INVITEs from the same
call hitting your proxy?
-Brett


On Thu, Jan 21, 2010 at 8:50 AM, Yannick LE COENT <yannick.lecoent at nexcom.fr
> wrote:

>  Hello,
>
>
>
> The next figure describes my problem.
>
>
>
>                  openSIPS
>
>                  +------+
>
> --  INVITE(1) -->|      |--- INVITE(1) -->
>
>                  |      |
>
> --  INVITE(2) -->|      |--- INVITE(2) -->
>
> <-- 180(2) ------|      |<-- 180(2) ------
>
> <-- 200(2) ------|      |<-- 200(2) ------
>
>                  |      |
>
> --  CANCEL(1) -->|      |
>
> <-- 200(CANCEL) -|      |
>
> <-- 487(1) ------|      |
>
> --  ACK(1) ----->|      |
>
>                  |      |
>
> --  ACK(2) ----->|      |--- ACK(2) ----->
>
>                  |      |
>
>                  +------+
>
>                     |
>
>                     |
>
>                  +------+
>
>                  |      |
>
>                  |      |
>
>                  +------+
>
>                  RTP proxy
>
>
>
> I use RTP proxy to relay media streams.
>
>
>
> INVITE (1) and (2) have been forked from an upstream proxy, thus they have
> the same Call-ID and From tag, and a different branch ID.
>
> INVITE (2) is accepted, but INVITE (1) has no response.
>
> The upstream proxy cancels INVITE (1).
>
>
>
> In my script, on CANCEL(1) request I close the RTP session, but I should
> not dot that since INVITE(2) has been accepted.
>
>
>
> My questions are:
>
> How can I know when I received CANCEL(1) that INVITE(2) has been accepted?
>
> Do I need to use flags? Which ones ?
>
>
>
> Thanks for any help,
>
> Yannick
>
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>
>
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