[OpenSIPS-Users] redirect gives "local ACK found -> dropping it!"

[Bogdan-Andrei Iancu]

Hi Jeremy,

What I see is that you have two contacts in the 302 reply - maybe the GW 
does not like this (especially that one has the port 9 in it, which a 
kind of /dev/null port).

First of all you need to check with the GW if they support and obey 3xx 
replies.  Secondly, you should try sending a 3xx with a single contact 
URI. When generating a 3xx reply, first contact is taken from RURI of 
the INVITE and additional contacts from the branches .

Regards,
Bogdan

On 03/27/2012 04:22 AM, Jeremy Malcolm wrote:
> On 26/03/2012, at 9:21 PM, Jeremy Malcolm wrote:
>
>> Thanks for the tip, it looks like UDP packets to the server I'm 
>> forwarding to are being blocked somewhere. :-(  Will take this up 
>> with my ISP, or something.
>
> No, sorry but I can rule that out now: I did some test calls from my 
> static-IP opensips box to my dynamic-IP Asterisk box and they worked. 
>  I can also confirm I am receiving calls from my DID provider to my 
> static-IP machine and that opensips is trying to redirect them, but 
> the DID provider is not following the redirection.
>
> This is what ngrep sees on my static-IP box when a call is made by the 
> DID provider (11.22.33.44 or dynamic.ip.box is my dynamic-IP box, 
> 55.66.77.88 or static.ip.box is my static IP box, 99.00.11.22 is the 
> DID provider, 33.44.55.66 is the caller); it sees the redirect going 
> out to the DID provider, and the acknowledgement of that:
>
> #
> U 55.66.77.88:5060 -> 99.00.11.22:5060
> SIP/2.0 302 Redirect.
> Via: SIP/2.0/UDP 99.00.11.22;branch=z9hG4bK4d2d.45a98547.0.
> Via: SIP/2.0/UDP 
> 33.44.55.66:16000;received=33.44.55.66;branch=z9hG4bK-d8754z-2d409d3e55d94f1e-1---d8754z-;rport=16000.
> To: <sip:user at 99.00.11.22:5060>;tag=61ae7837698e5c9f3ea027df6cb50162.f190.
> From: "caller"<sip:caller at 33.44.55.66>;tag=7b050e32.
> Call-ID: NDcxNDQyYjAwNWI5MTEzMjgwNDBkMWU1NDY0OTY4NTk..
> CSeq: 1 INVITE.
> Contact: sip:user at dynamic.ip.box, sip:user at dynamic.ip.box:9.
> Server: OpenSIPS (1.8.0-beta-notls (x86_64/linux)).
> Content-Length: 0.
> .
>
> #
> U 99.00.11.22:5060 -> 55.66.77.88:5060
> ACK sip:user at static.ip.box SIP/2.0.
> Via: SIP/2.0/UDP 99.00.11.22;branch=z9hG4bK4d2d.45a98547.0.
> Max-Forwards: 69.
> To: <sip:user at 99.00.11.22:5060>;tag=61ae7837698e5c9f3ea027df6cb50162.f190.
> From: "caller"<sip:caller at 33.44.55.66>;tag=7b050e32.
> Call-ID: NDcxNDQyYjAwNWI5MTEzMjgwNDBkMWU1NDY0OTY4NTk..
> CSeq: 1 ACK.
> Content-Length: 0.
> .
>
> So this is all correct, and should make the DID provider redirect the 
> call?  If so, where to troubleshoot from here?  Nothing is coming 
> through at the dynamic-IP box at all.  I also tried using the 
> dynamic-IP box's IP address instead of its domain name, in case it was 
> a DNS caching issue.  Is the DID provider at fault for not following 
> the redirect as it should?
>
> --
> Jeremy Malcolm PhD LLB (Hons) B Com
> Internet and Open Source lawyer, consumer advocate and geek
> host -t NAPTR 5.9.8.5.2.8.2.2.1.0.6.e164.org|awk -F! '{print $3}
>
>
>


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

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