[OpenSIPS-Users] hairpin and outside of dialog detection

[Bogdan-Andrei Iancu]

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opensips.org/pipermail/users/attachments/20140522/57145ccd/attachment.htm>