Kamailio ignores some ACK - sr-users

9 May 2012

Seems like a loose routing issue. Are you loose routing in your
config file?

On Wed, May 9, 2012 at 4:34 PM, Stoyan Mihaylov
<stoyan.v.mihaylov@gmail.com <mailto:stoyan.v.mihaylov@gmail.com>>
wrote:

    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@gmail.com <mailto:efelin.novak@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@server.com
        <mailto:sip%3Abob@server.com>>;tag=cb7dd641
        From: <sip:alice@111.111.11.50
        <mailto:sip%3Aalice@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@111.111.11.50
        <mailto:sip%3Aalice@111.111.11.50>>;tag=599248D4-260
        To: "test_account"<sip:bob@server.com
        <mailto:sip%3Abob@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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