[OpenSIPS-Users] How to overcome SIP ALG on Wi-Fi routers

[Bogdan-Andrei Iancu]

As per that capture, I assume that 162.249.6.110 is your server.  And 
there is nothing send further from that IP - only incoming traffic.

The next question - is this INVITE reaching your opensips script ? to be 
sure that the OS delivers the UDP packet to the opensips application.

Regards,

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

On 06.05.2016 19:28, Nabeel wrote:
>
> The trace I posted earlier is what I see with tcpdump when attempting 
> a call. There is no other INVITE shown in the trace: 
> http://pastebin.com/raw/C4iymTbh
>
> The trace seems to end abruptly in the middle of the SDP, so I think 
> it could be due to packet fragmentation.
>
> On 6 May 2016 4:18 pm, "Bogdan-Andrei Iancu" <bogdan at opensips.org 
> <mailto:bogdan at opensips.org>> wrote:
>
>     So that meas the INVITE never gets to the callee ?? maybe it is
>     not properly routed .
>
>     Do you see (with ngrep or tcpdump) the INVITE being sent out by
>     opensips towards callee ?
>
>     Regards,
>
>     Bogdan-Andrei Iancu
>     OpenSIPS Founder and Developer
>     http://www.opensips-solutions.com
>
>     On 06.05.2016 12:56, Nabeel wrote:
>>
>>     Hi,
>>
>>     Thanks for the idea about packet compression. By 'call fails to
>>     connect', I meant the call does not connect to the callee, ie.
>>     the callee's phone does not ring after the INVITE (despite using
>>     TURN server).
>>
>>     This was a public WiFi network and that was all I could get at
>>     the time. I am using OpenSIPS version 2.1.
>>
>>     Nabeel
>>
>>     On 6 May 2016 9:16 am, "Bogdan-Andrei Iancu" <bogdan at opensips.org
>>     <mailto:bogdan at opensips.org>> wrote:
>>
>>         Hi,
>>
>>         Hard to analyze a call based on the INVITE packet only :).
>>         Still the SIP signaling does not show any ALG interference
>>         (also not sure if the capture was done before or after the
>>         ALG). Also, what you mean by "call fails" ?no reply, negative
>>         reply , no audio ?
>>
>>         Regards,
>>
>>         Bogdan-Andrei Iancu
>>         OpenSIPS Founder and Developer
>>         http://www.opensips-solutions.com
>>
>>         On 05.05.2016 22:35, Nabeel wrote:
>>>
>>>         Please check the following SIP trace taken within a WiFi
>>>         network. The call fails to connect despite the INVITE
>>>         request and using a non-standard port. Could this be caused
>>>         by SIP ALG, or some unopened RTP port on the router?
>>>
>>>         http://pastebin.com/raw/C4iymTbh
>>>
>>>
>>>         _______________________________________________
>>>         Users mailing list
>>>         Users at lists.opensips.org <mailto:Users at lists.opensips.org>
>>>         http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>
>

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