[OpenSIPS-Users] hairpin and outside of dialog detection

[frank fox]

Thank you Bogdan for the reply.

I am wondering if I can use the get_dialog__info somehow to find out the original Invite (A) is sent back.

I am still investigating if my SIP flow will always keep the contract (with the VIA header solution).

Is there any other modules or functions that I could possibly use?

Thank you,
Frank

--- Original Message ---

From: "Bogdan-Andrei Iancu" <bogdan at opensips.org>
Sent: May 22, 2014 1:06 PM
To: "frank fox" <franklyfox at outlook.com>, users at lists.opensips.org
Subject: Re: hairpin and outside of dialog detection

Hello Frank,

Well, the match dialog does not work for this as the second INVITE is
not a sequential request, but an initial one (the dialog wise matching
is done only on the sequential requests).

You can do the check by looking at the IPs in the VIA header, hoping
proxy2 is doing no topo hiding. So, when the call is back to proxy1, the
via[2] ip should belong to itself.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 20.05.2014 21:48, frank fox wrote:
>
> Greetings:
>
> I have a scenario as below:
> Proxy-1 ---(A)---> Proxy-2
>        <----(B)------------
>
> (A) := Initial Invite from proxy-1 to proxy-2
> (B) := proxy-2 modifies the $rd and sends the initial Invite back to
> proxy-1
>
> Question:
> How can the proxy-1 knows that the coming Invite was originally sent
> by itself?
>
> It seems the match_dialog() doesn't work for this situation:
>
> dialog::  hash=3514:62628069"7"
>         state:: 2
>         user_flags:: 65536
>         timestart:: 0
>         timeout:: 0
>         callid:: a7ab8ff06766fabe1b4846712fba1051 at 10.242.65.162
>         from_uri:: sip:19905635611 at 10.242.65.162
>         to_uri:: sip:19905591214 at external-sip.vocalocity.com
>         caller_tag:: 14174341581400528279229
>         caller_contact:: sip:19905635611 at 10.242.65.162:5060
>         callee_cseq:: 0
>         caller_route_set::
>         caller_bind_addr:: udp:10.116.239.217:5060
>         callee_tag:: 16423468221400528279248
>         callee_contact::
>            caller_cseq:: 102
>         callee_route_set::
>         callee_bind_addr:: udp:10.116.239.217:5060
>
>
> dialog::  hash=3514:62628069"8"
>         state:: 2
>         user_flags:: 65536
>         timestart:: 0
>         timeout:: 0
>         callid:: a7ab8ff06766fabe1b4846712fba1051 at 10.242.65.162
>         from_uri:: sip:19905635611 at 10.242.65.162
>         to_uri:: sip:19905591214 at external-sip.vocalocity.com
>         caller_tag:: 14174341581400528279229
>         caller_contact::
>         callee_cseq:: 0
>         caller_route_set::
>         caller_bind_addr:: udp:10.116.239.217:5060
>         callee_tag:: 16423468221400528279248
>         callee_contact::
>         caller_cseq:: 102
>         callee_route_set::
>         callee_bind_addr:: udp:10.116.239.217:5060
>
>
> Regards,
> Frank

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