[OpenSIPS-Users] ms teams ACK

[Ben Newlin]

I have not read the MS Teams article, but from a SIP perspective your ACK is malformed. The Request URI in the ACK - and any other sequential requests - must be the Contact URI from the 200 OK response. Your ACK Request URI has the parameters from the Contact header, but the domain/host is different. I'm guessing your script may be modifying that value as it passes the ACK through?

Also, your ACK does not contain the complete Route set from the 200 OK, it only contains the first entry.

Ben Newlin 

On 4/29/20, 10:00 AM, "Users on behalf of Santi Anton" <users-bounces at lists.opensips.org on behalf of Santi.Anton at quarea.com> wrote:

    Hello Ben,

    I agree. These are the INVITE and 200 OK. I only could see that to and from
    tag an Call-ID are the same. I think that in the article there is nothing
    about modifying ACK headers to make it work.


    INVITE sip:5009 at sip.pstnhub.microsoft.com SIP/2.0
    Record-Route:
    <sip:sbc.xxxxxxxxxx.com:5067;transport=tls;lr;did=12a.a46808d1;r2=on>
    Record-Route: <sip:195.xx.xx.xx:5060;lr;did=12a.a46808d1;r2=on>
    Via: SIP/2.0/TLS 195.xx.xx.xx:5067;branch=z9hG4bK2f83.ee24a46.0
    Via: SIP/2.0/UDP
    80.xx.xx.xx.xx:5060;received=80.xx.xx.xx.xx;branch=z9hG4bK4df6ca5c;rport=5060
    Max-Forwards: 69
    From: <sip:935441221 at 80.xx.xx.xx.xx>;tag=as7659f57d
    To: <sip:5009 at sbc.xxxxxxxxxx.com:5068>
    Contact: <sip:935441221 at 80.xx.xx.xx.xx:5060>
    Call-ID: 433371746cb44b7d76fdc42013bf92b8 at 80.xx.xx.xx.xx:5060
    CSeq: 102 INVITE
    User-Agent: FPBX-12.0.76.6(11.20.0)
    Date: Mon, 27 Apr 2020 16:25:24 GMT
    Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
    PUBLISH, MESSAGE
    Supported: replaces, timer
    Content-Type: application/sdp
    Content-Length: 1470


    SIP/2.0 200 OK
    FROM: <sip:935441221 at 80.xx.xx.xx.xx>;tag=as7659f57d
    TO: <sip:5009 at sbc.xxxxxxxxxx.com:5068>;tag=50fe42a7fdb64fe583c1089a0b47f44a
    CSEQ: 102 INVITE
    CALL-ID: 433371746cb44b7d76fdc42013bf92b8 at 80.xx.xx.xx.xx:5060
    VIA: SIP/2.0/TLS 195.xx.xx.xx:5067;branch=z9hG4bK2f83.ee24a46.0,SIP/2.0/UDP
    80.xx.xx.xx.xx:5060;received=80.xx.xx.xx.xx;branch=z9hG4bK4df6ca5c;rport=5060
    RECORD-ROUTE:
    <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr>,<sip:sbc.xxxxxxxxxx.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: 827
    SUPPORTED: timer
    CONTENT-TYPE: application/sdp
    ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY
    SESSION-EXPIRES: 3600;refresher=uas
    SERVER: Microsoft.PSTNHub.SIPProxy v.2020.4.20.2 i.EUWE.6

    Best Regards,



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

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