A BYE ~30s after the ACK usually means the ACK was not accepted or associated 
with the call. This is usually due to some problem with the ACK. The ACK 
responses must be built according to specific requirements based on the INVITE 
and 200 OK values, so it is not possible to say for sure whether there is 
anything wrong with the ACK with only the ACK and BYE.

Ben Newlin 

On 4/29/20, 4:14 AM, "Users on behalf of Santi Anton" 
<users-boun...@lists.opensips.org on behalf of santi.an...@quarea.com> wrote:

    Hello,

    If it helps, these are the ACK sent to MSTeams and BYE received after 20
    seconds.

    sbc.xxxxxxxx.com:5067 Opensips TLS interface
    195.xx.xx.xx:5068 Opensips UDP interface
    80.xx.xx.xx:5060 Asterisk


    ACK
    
sip:sip.pstnhub.microsoft.com;x-i=0c135a71-ddec-454c-a506-91079cb038d7;x-c=385a4453fc885c0bb6276a40d7796d3a/s/1/e1c45d052842415e9c0b3b0b04e32791
    SIP/2.0
    Via: SIP/2.0/TLS 195.xx.xx.xx:5067;branch=z9hG4bK2f83.ee24a46.2
    Via: SIP/2.0/UDP
    80.xx.xx.xx:5060;received=80.xx.xx.xx;branch=z9hG4bK0a1d079a;rport=5060
    Route: <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr>
    Max-Forwards: 69
    From: <sip:935441...@80.xx.xx.xx>;tag=as7659f57d
    To: <sip:5...@sbc.xxxxxxxxxx.com:5068>;tag=50fe42a7fdb64fe583c1089a0b47f44a
    Contact: <sip:935441...@80.xx.xx.xx:5060>
    Call-ID: 433371746cb44b7d76fdc42013bf9...@80.xx.xx.xx:5060:5060
    CSeq: 102 ACK
    User-Agent: FPBX-12.0.76.6(11.20.0)
    Content-Length: 0


    BYE sip:935441...@80.xx.xx.xx:5060 SIP/2.0
    FROM:
    <sip:5...@sbc.xxxxxxxxxx.com:5068>;tag=50fe42a7fdb64fe583c1089a0b47f44a
    TO: <sip:935441...@80.xx.xx.xx>;tag=as7659f57d
    CSEQ: 3 BYE
    CALL-ID: 433371746cb44b7d76fdc42013bf9...@80.xx.xx.xx:5060
    MAX-FORWARDS: 69
    VIA: SIP/2.0/TLS 52.114.75.24:5061;branch=z9hG4bKf36698cf
    REASON: Q.850;cause=18;text="0c135a71-ddec-454c-a506-91079cb038d7;*Call
    Controller timed out while waiting for acknowledgement.*"
    ROUTE:
    
<sip:sbc.xxxxxxxxxx.com.com:5067;transport=tls;lr;did=12a.a46808d1;r2=on>,<sip:195.xx.xx.xx:5060;lr;did=12a.a46808d1;r2=on>
    CONTACT:
    <sip:api-du-b-euwe.pstnhub.microsoft.com:443;x-i=0c135a71-ddec-454c-a506
    
91079cb038d7;x-c=385a4453fc885c0bb6276a40d7796d3a/s/1/e1c45d052842415e9c0b3b0b04e32791>
    CONTENT-LENGTH: 0
    USER-AGENT: Microsoft.PSTNHub.SIPProxy v.2020.4.20.2 i.EUWE.6
    ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY

    Best Regards,



    --
    Sent from: 
http://opensips-open-sip-server.1449251.n2.nabble.com/OpenSIPS-Users-f1449235.html

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