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#10.255.1.4 - CSipSimple client address for OpenVPN tunnel
#10.0.1.88  - Twinkle client 
#192.168.1.53 - Android phone wireless interface address where CSipSimple runs

Internet Protocol, Src: 10.255.1.4 (10.255.1.4), Dst: 10.0.1.88 (10.0.1.88)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 1037
    Identification: 0x0000 (0)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 63
    Protocol: UDP (17)
    Header checksum: 0x2286 [correct]
        [Good: True]
        [Bad: False]
    Source: 10.255.1.4 (10.255.1.4)
    Destination: 10.0.1.88 (10.0.1.88)
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
    Source port: sip (5060)
    Destination port: sip (5060)
    Length: 1017
    Checksum: 0xcb73 [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
Session Initiation Protocol
    Request-Line: INVITE sip:testuser@10.0.1.88 SIP/2.0
        Method: INVITE
        Request-URI: sip:testuser@10.0.1.88
            Request-URI User Part: testuser
            Request-URI Host Part: 10.0.1.88
        [Resent Packet: False]
    Message Header
        Via: SIP/2.0/UDP 192.168.1.53:5060;rport;branch=z9hG4bKPjRsKB5XzjJBHm7c7Sqv5XNl4IbuX3ZzMe
            Transport: UDP
            Sent-by Address: 192.168.1.53
            Sent-by port: 5060
            RPort: rport
            Branch: z9hG4bKPjRsKB5XzjJBHm7c7Sqv5XNl4IbuX3ZzMe
        Max-Forwards: 70
        From: <sip:192.168.1.53>;tag=CRH9U1bdADcvgB6diMzVEQ86URkTYO6M
            SIP from address: sip:192.168.1.53
                SIP from address Host Part: 192.168.1.53
            SIP tag: CRH9U1bdADcvgB6diMzVEQ86URkTYO6M
        To: <sip:testuser@10.0.1.88>
            SIP to address: sip:testuser@10.0.1.88
                SIP to address User Part: testuser
                SIP to address Host Part: 10.0.1.88
        Contact: <sip:192.168.1.53:5060;ob>
            Contact-URI: sip:192.168.1.53:5060;ob
                Contact-URI Host Part: 192.168.1.53
                Contact-URI Host Port: 5060
            Contact parameter: ob>
        Call-ID: 41TK47.m9I4cXxCM3Xdoca.x7ty1NNxQ
        CSeq: 6308 INVITE
            Sequence Number: 6308
            Method: INVITE
        Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
        Supported: replaces, 100rel, timer, norefersub
        Session-Expires: 1800
        Min-SE: 90
        User-Agent: CSipSimple r986 / heroc-10
        Content-Type: application/sdp
        Content-Length:   394
    Message Body
        Session Description Protocol
            Session Description Protocol Version (v): 0
            Owner/Creator, Session Id (o): - 3519873297 3519873297 IN IP4 192.168.1.53
                Owner Username: -
                Session ID: 3519873297
                Session Version: 3519873297
                Owner Network Type: IN
                Owner Address Type: IP4
                Owner Address: 192.168.1.53
            Session Name (s): pjmedia
            Connection Information (c): IN IP4 192.168.1.53
                Connection Network Type: IN
                Connection Address Type: IP4
                Connection Address: 192.168.1.53
            Time Description, active time (t): 0 0
                Session Start Time: 0
                Session Stop Time: 0
            Session Attribute (a): X-nat:0
                Session Attribute Fieldname: X-nat
                Session Attribute Value: 0
            Media Description, name and address (m): audio 4006 RTP/AVP 9 104 103 102 0 8 101
                Media Type: audio
                Media Port: 4006
                Media Protocol: RTP/AVP
                Media Format: ITU-T G.722
                Media Format: DynamicRTP-Type-104
                Media Format: DynamicRTP-Type-103
                Media Format: DynamicRTP-Type-102
                Media Format: ITU-T G.711 PCMU
                Media Format: ITU-T G.711 PCMA
                Media Format: DynamicRTP-Type-101
            Media Attribute (a): rtcp:4007 IN IP4 192.168.1.53
                Media Attribute Fieldname: rtcp
                Media Attribute Value: 4007 IN IP4 192.168.1.53
            Media Attribute (a): rtpmap:9 G722/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 9
                MIME Type: G722
                Sample Rate: 8000
            Media Attribute (a): rtpmap:104 speex/32000
                Media Attribute Fieldname: rtpmap
                Media Format: 104
                MIME Type: speex
                Sample Rate: 32000
            Media Attribute (a): rtpmap:103 speex/16000
                Media Attribute Fieldname: rtpmap
                Media Format: 103
                MIME Type: speex
                Sample Rate: 16000
            Media Attribute (a): rtpmap:102 speex/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 102
                MIME Type: speex
                Sample Rate: 8000
            Media Attribute (a): rtpmap:0 PCMU/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 0
                MIME Type: PCMU
                Sample Rate: 8000
            Media Attribute (a): rtpmap:8 PCMA/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 8
                MIME Type: PCMA
                Sample Rate: 8000
            Media Attribute (a): sendrecv
            Media Attribute (a): rtpmap:101 telephone-event/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 101
                MIME Type: telephone-event
                Sample Rate: 8000
            Media Attribute (a): fmtp:101 0-15
                Media Attribute Fieldname: fmtp
                Media Format: 101 [telephone-event]
                Media format specific parameters: 0-15