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

[Jeremy Malcolm]

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}



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