snom 300 register sip trace

Session Initiation Protocol (REGISTER)
    Request-Line: REGISTER sip:sip.provider.com SIP/2.0
        Method: REGISTER
        Request-URI: sip:sip.provider.com
            Request-URI Host Part: sip.provider.com
        [Resent Packet: False]
    Message Header
        Via: SIP/2.0/UDP 10.0.1.2:2051;branch=z9hG4bK-ovhxcfbokokx;rport
            Transport: UDP
            Sent-by Address: 10.0.1.2
            Sent-by port: 2051
            Branch: z9hG4bK-ovhxcfbokokx
            RPort: rport
        From: <sip:username@sip.provider.com>;tag=6mstlsobnv
            SIP from address: sip:username@sip.provider.com
                SIP from address User Part: username
                SIP from address Host Part: sip.provider.com
            SIP from tag: 6mstlsobnv
        To: <sip:username@sip.provider.com>
            SIP to address: sip:username@sip.provider.com
                SIP to address User Part: username
                SIP to address Host Part: sip.provider.com
        Call-ID: 3c27532de57e-8025hrw91ucu@IP150-00300A6E5BEB
        CSeq: 1061 REGISTER
            Sequence Number: 1061
            Method: REGISTER
        Max-Forwards: 70
         [truncated]Contact: <sip:username@10.0.1.2:2051;line=4c1qkeyr>;flow-id=1;q=1.0;+sip.instance="<urn:uuid:20a4de28-433b-4ee1-b01c-e34831c95112>";audio;mobility="fixed";duplex="full";description="IP150";actor="principal";events="dialog
            Contact URI: sip:username@10.0.1.2:2051;line=4c1qkeyr
                Contact URI User Part: username
                Contact URI Host Part: 10.0.1.2
                Contact URI Host Port: 2051
                Contact URI parameter: line=4c1qkeyr
            Contact parameter: flow-id=1
            Contact parameter: q=1.0
            Contact parameter: +sip.instance="<urn:uuid:20a4de28-433b-4ee1-b01c-e34831c95112>"
            Contact parameter: audio
            Contact parameter: mobility="fixed"
            Contact parameter: duplex="full"
            Contact parameter: description="IP150"
            Contact parameter: actor="principal"
            Contact parameter: events="dialog"
            Contact parameter: methods="INVITE,ACK,CANCEL,BYE,REFER,OPTIONS,NOTIFY,SUBSCRIBE,PRACK,MESSAGE,INFO"\r\n
        User-Agent: IP150/1.5
        Supported: gruu
        Allow-Events: dialog
        X-Real-IP: 10.0.1.2
            [Expert Info (Note/Undecoded): Unrecognised SIP header (x-real-ip)]
                [Unrecognised SIP header (x-real-ip)]
                [Severity level: Note]
                [Group: Undecoded]
        WWW-Contact: <http://10.0.1.2:80>
            [Expert Info (Note/Undecoded): Unrecognised SIP header (www-contact)]
                [Unrecognised SIP header (www-contact)]
                [Severity level: Note]
                [Group: Undecoded]
        WWW-Contact: <https://10.0.1.2:443>
            [Expert Info (Note/Undecoded): Unrecognised SIP header (www-contact)]
                [Unrecognised SIP header (www-contact)]
                [Severity level: Note]
                [Group: Undecoded]
        Expires: 3600
        Content-Length: 0