[OpenSIPS-Users] ACK looping issue with end-point co-located with OpenSIPS

Daniel Eiland daniel.eiland at gmail.com
Tue Oct 16 00:33:48 CEST 2012

Hi folks,

I've got an issue with ACK messages being looped when they are sent to an
endpoint that is co-located with my OpenSIPS proxy.

I've got OpenSIPS located on server A @ port 5060 and two conference
endpoints: C01 on server A @ port 5070 and C02 on a separate server.

When my client calls into C01, the ACK message is continually routed by
OpenSIPS back into itself instead of the conference endpoint listening on
port 5070.  This doesn't happened when I call into C02, OpenSIPS properly
routes it to the right destination.

When I compare the two ACKs, they are fairly similar and when I looked at
some OpenSIPS logs both messages are being routed in a similar fashion
namely loose_route is true.  The only difference (which I'm sure if the
problem, I'm just not sure why) is that the ACK to C01 has Destination User
($du) of while the ACK to C02 has a $du of NULL.

If anyone has any suggestions, I'd be grateful.


Also here are the two ACKs for comparison:

ACK sip:C01 at;transport=udp SIP/2.0
Via: SIP/2.0/UDP
Max-Forwards: 70
From: "deiland" <sip:1001 at
To: <sip:C01 at>;tag=ma94e0688avFj
Call-ID: 5c35c0a5dcb442a9afd324c988bd0a3c
CSeq: 24503 ACK
Route: <sip:;lr>
User-Agent: Blink 0.2.7 (Windows)
Content-Length:  0

ACK sip:C02 at;transport=udp SIP/2.0
Via: SIP/2.0/UDP
Max-Forwards: 70
From: "deiland" <sip:1001 at
To: <sip:C02 at>;tag=54aZ48KZ7a9Xj
Call-ID: afddb9bea6714f95bd84dff2159e2b14
CSeq: 11988 ACK
Route: <sip:;lr>
User-Agent: Blink 0.2.7 (Windows)
Content-Length:  0
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