[SR-Users] Kamailio ignores some ACK

[Stoyan Mihaylov]

You can use something like wireshark on Kamailio server to see if ACK
packets go in right direction.
I had problem with ACK and BYE, and I saw that in some cases ACK and BYE
packets looped back in kamailio.
May be I used wrong client.

On Wed, May 9, 2012 at 5:15 PM, Efelin Novak <efelin.novak at gmail.com> wrote:

> Hi folks,
>
> I have a strange problem when Kamailio ignores ACKs in a specific
> scenario. The call flow is as follows:
>
> A -> INVITE -> kamailio -> INVITE -> B
> [omitting 100 and 180]
> A <- 200 OK <- kamailio <- 200 OK <- B
> A -> ACK -> kamailio
>
> There are INVITE Xlogs, Reply ROUTE xlogs and media-proxy logs in the
> syslog. However there is no information about these ACKs. No XLOGs are
> printed even if there is one on the top of the main route.
>
> "tcpdump -A -s0 -i any -n port 5060" receives this message correctly:
>
> 14:47:01.246153 IP 111.111.11.11.5060 > 80.80.80.80.60442: SIP, length: 915
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP
> 111.111.11.11:5060
> ;rport=60442;x-route-tag="tgrp:A";branch=z9hG4bK1634E6A88
> Record-Route:
> <sip:111.111.11.11;lr;ftag=599248D4-260;vsf=AAAAAAAAAAAAAAAAAAAAW0FVT0ZWHF1aNy4xGzA-;nat=yes;did=3bb.327c47e6>
> Contact: <sip:80.80.80.80:65002;transport=udp>
> To: "test_account"<sip:bob at server.com>;tag=cb7dd641
> From: <sip:alice at 111.111.11.50>;tag=599248D4-260
> Call-ID: 9AFCFC51.11.50
> CSeq: 101 INVITE
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, OPTIONS, INFO, SUBSCRIBE,
> UPDATE
> Content-Type: application/sdp
> Content-Length:263
>
> v=0
> o=- 492575093 492575093 IN IP4 111.111.11.60
> s=test_device
> i=(o=IN IP4 192.168.1.10)
> c=IN IP4 111.111.11.71
> t=0 0
> m=audio 16416 RTP/AVP 18 101
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=no
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=ptime:20
>
> 14:47:01.254511 IP 111.111.11.50.60442 > 111.111.11.11.5060: SIP, length:
> 521
> ACK sip:80.80.80.80:65002;transport=udp SIP/2.0
> Via: SIP/2.0/UDP
> 111.111.11.50:5060;x-route-tag="tgrp:A";branch=z9hG4bK1634E7DE8
> From: <sip:alice at 111.111.11.50>;tag=599248D4-260
> To: "test_account"<sip:bob at server.com>;tag=cb7dd641
> Call-ID: 9AFCFC51.11.50
> Route:
> <sip:111.111.11.11;lr;ftag=599248D4-260;vsf=AAAAAAAAAAAAAAAAAAAAW0FVT0ZWHF1aNy4xGzA-;nat=yes;did=3bb.327c47e6>
> Max-Forwards: 70
> CSeq: 101 ACK
> Content-Length: 0
>
> My Kamailio version is kamailio 3.1.0 (i386/linux) 1e204f.
> Does anybody knows where can be a problem?
> How can I check whether Kamailio receives something?
>
> ...
>
> Jan
>
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