Session Initiation Protocol
    Request-Line: NOTIFY sip:875@10.0.0.8:5060;transport=udp SIP/2.0
        Method: NOTIFY
        [Resent Packet: False]
    Message Header
        Via: SIP/2.0/UDP 2.2.2.2:5060;branch=z9hG4bK4f764a43;rport
            Transport: UDP
            Sent-by Address: 2.2.2.2
            Sent-by port: 5060
            Branch: z9hG4bK4f764a43
            RPort: rport
        Max-Forwards: 70
        From: "" <sip:877@2.2.2.2:5060>;tag=as0953e467
            SIP Display info: ""
            SIP from address: sip:877@2.2.2.2:5060
            SIP tag: as0953e467
        To: "" <sip:875@2.2.2.2:5060>;tag=a62240c585
            SIP Display info: ""
            SIP to address: sip:875@2.2.2.2:5060
            SIP tag: a62240c585
        Contact: <sip:877@2.2.2.2>
            Contact Binding: <sip:877@2.2.2.2>
                URI: <sip:877@2.2.2.2>
                    SIP contact address: sip:877@2.2.2.2
        Call-ID: c211509f711ba312
        CSeq: 102 NOTIFY
            Sequence Number: 102
            Method: NOTIFY
        User-Agent: Asterisk PBX 1.6.0.15
        Event: dialog
        Content-Type: application/dialog-info+xml
        Subscription-State: active
        Content-Length: 226
    Message Body
        <?xml version="1.0"?>\n
        <dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sip:877@2.2.2.2:5060">\n
        <dialog id="877" direction="recipient">\n
        <state>early</state>\n
        </dialog>\n
        </dialog-info>\n