[SR-Users] ACK to 200 OK without to tag

Kjeld Flarup kjeld.flarup at liberalismen.dk
Sun Jun 3 23:04:47 CEST 2018


We have a SIP doorstation Grandstream GDS3710. When I connect it via 
kamailio, it does not setup call correct.

Kamailio sends a 200 OK with this to field:
         t: 
<sip:0001 at 192.168.1.150:5069>;tag=e33a13d3-c18c-4df1-b68f-446e42957de6

Grandstream answers with:
         To: <sip:0001 at 192.168.1.150:5069>

As the code follows this example: 
https://kamailio.org/docs/modules/4.3.x/modules/dispatcher.html#dispatcher.ex.config, 
it seems obvious that this will fail, as there is not

route[WITHINDLG] {
     if (has_totag()) {

There simply is not to tag. Is this a bug in the grandstream?

If so how could that go unnoticed, or is it me who misses something?

I have attached the full sip text for the 200OK and the ACK

-- 
-------------------- Med Liberalistiske Hilsner ----------------------
    Civilingeniør, Kjeld Flarup - Mit sind er mere åbent end min tegnebog
    Sofienlundvej 6B, 7560 Hjerm, Tlf: 40 29 41 49
    Den ikke akademiske hjemmeside for liberalismen - www.liberalismen.dk

-------------- next part --------------
  43847 12:49:34.444277    192.168.1.150         192.168.1.155         SIP/SDP  320    Status: 200 OK | 

Frame 43847: 320 bytes on wire (2560 bits), 320 bytes captured (2560 bits)
    Encapsulation type: Linux cooked-mode capture (25)
    Arrival Time: Jun  3, 2018 14:49:34.444277000 CEST
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1528030174.444277000 seconds
    [Time delta from previous captured frame: 0.000026000 seconds]
    [Time delta from previous displayed frame: 0.000026000 seconds]
    [Time since reference or first frame: 21839.020163000 seconds]
    Frame Number: 43847
    Frame Length: 320 bytes (2560 bits)
    Capture Length: 320 bytes (2560 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: sll:ethertype:ip:udp:sip:sdp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Linux cooked capture
    Packet type: Sent by us (4)
    Link-layer address type: 1
    Link-layer address length: 6
    Source: Raspberr_fb:99:9f (b8:27:eb:fb:99:9f)
    Unused: fffe
    Protocol: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.1.150, Dst: 192.168.1.155
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x10 (DSCP: Unknown, ECN: Not-ECT)
        0001 00.. = Differentiated Services Codepoint: Unknown (4)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 304
    Identification: 0x3c2f (15407)
    Flags: 0x00b9
        0... .... .... .... = Reserved bit: Not set
        .0.. .... .... .... = Don't fragment: Not set
        ..0. .... .... .... = More fragments: Not set
        ...0 0000 1011 1001 = Fragment offset: 185
    Time to live: 64
    Protocol: UDP (17)
    Header checksum: 0xb843 [validation disabled]
    [Header checksum status: Unverified]
    Source: 192.168.1.150
    Destination: 192.168.1.155
    [2 IPv4 Fragments (1764 bytes): #43845(1480), #43847(284)]
        [Frame: 43845, payload: 0-1479 (1480 bytes)]
        [Frame: 43847, payload: 1480-1763 (284 bytes)]
        [Fragment count: 2]
        [Reassembled IPv4 length: 1764]
        [Reassembled IPv4 data: 13cd13c406e440da5349502f322e3020323030204f4b0d0a...]
User Datagram Protocol, Src Port: 5069, Dst Port: 5060
    Source Port: 5069
    Destination Port: 5060
    Length: 1764
    Checksum: 0x40da [unverified]
    [Checksum Status: Unverified]
    [Stream index: 3]
Session Initiation Protocol (200)
    Status-Line: SIP/2.0 200 OK
        Status-Code: 200
        [Resent Packet: True]
        [Suspected resend of frame: 43826]
        [Request Frame: 43831]
        [Response Time (ms): 498]
    Message Header
        v: SIP/2.0/UDP 192.168.1.155:5060;rport=5060;received=192.168.1.155;branch=z9hG4bK1571336256
            Transport: UDP
            Sent-by Address: 192.168.1.155
            Sent-by port: 5060
            RPort: 5060
            Received: 192.168.1.155
            Branch: z9hG4bK1571336256
        Record-Route: <sip:5.103.133.210:5070;transport=tcp;lr;r2=on;ftag=851466465;vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i;nat=yes>
            Record-Route URI: sip:5.103.133.210:5070;transport=tcp;lr;r2=on;ftag=851466465;vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i;nat=yes
                Record-Route Host Part: 5.103.133.210
                Record-Route Host Port: 5070
                Record-Route URI parameter: transport=tcp
                Record-Route URI parameter: lr
                Record-Route URI parameter: r2=on
                Record-Route URI parameter: ftag=851466465
                Record-Route URI parameter: vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i
                Record-Route URI parameter: nat=yes
        Record-Route: <sip:127.0.0.1:5070;lr;r2=on;ftag=851466465;vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i;nat=yes>
            Record-Route URI: sip:127.0.0.1:5070;lr;r2=on;ftag=851466465;vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i;nat=yes
                Record-Route Host Part: 127.0.0.1
                Record-Route Host Port: 5070
                Record-Route URI parameter: lr
                Record-Route URI parameter: r2=on
                Record-Route URI parameter: ftag=851466465
                Record-Route URI parameter: vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i
                Record-Route URI parameter: nat=yes
        Record-Route: <sip:127.0.0.1:5069;lr;r2=on;ftag=851466465;vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-;did=096.e362;vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA-->
            Record-Route URI: sip:127.0.0.1:5069;lr;r2=on;ftag=851466465;vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-;did=096.e362;vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA--
                Record-Route Host Part: 127.0.0.1
                Record-Route Host Port: 5069
                Record-Route URI parameter: lr
                Record-Route URI parameter: r2=on
                Record-Route URI parameter: ftag=851466465
                Record-Route URI parameter: vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-
                Record-Route URI parameter: did=096.e362
                Record-Route URI parameter: vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA--
        Record-Route: <sip:192.168.1.150:5069;lr;r2=on;ftag=851466465;vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-;did=096.e362;vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA-->
            Record-Route URI: sip:192.168.1.150:5069;lr;r2=on;ftag=851466465;vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-;did=096.e362;vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA--
                Record-Route Host Part: 192.168.1.150
                Record-Route Host Port: 5069
                Record-Route URI parameter: lr
                Record-Route URI parameter: r2=on
                Record-Route URI parameter: ftag=851466465
                Record-Route URI parameter: vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-
                Record-Route URI parameter: did=096.e362
                Record-Route URI parameter: vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA--
        i: 1347286846-5060-7 at BJC.BGI.B.BFF
        f: "du1" <sip:du1 at 192.168.1.150:5069>;tag=851466465
            SIP Display info: "du1"
            SIP from address: sip:du1 at 192.168.1.150:5069
                SIP from address User Part: du1
                SIP from address Host Part: 192.168.1.150
                SIP from address Host Port: 5069
            SIP from tag: 851466465
        t: <sip:0001 at 192.168.1.150:5069>;tag=e33a13d3-c18c-4df1-b68f-446e42957de6
            SIP to address: sip:0001 at 192.168.1.150:5069
                SIP to address User Part: 0001
                SIP to address Host Part: 192.168.1.150
                SIP to address Host Port: 5069
            SIP to tag: e33a13d3-c18c-4df1-b68f-446e42957de6
        CSeq: 60 INVITE
            Sequence Number: 60
            Method: INVITE
        m: <sip:004521176217 at 192.168.1.1:51850;transport=TCP;ob>
            Contact URI: sip:004521176217 at 192.168.1.1:51850;transport=TCP;ob
                Contact URI User Part: 004521176217
                Contact URI Host Part: 192.168.1.1
                Contact URI Host Port: 51850
                Contact URI parameter: transport=TCP
                Contact URI parameter: ob
        k: replaces, 100rel, timer, norefersub
        c: application/sdp
        l:   705
    Message Body
        Session Description Protocol
            Session Description Protocol Version (v): 0
            Owner/Creator, Session Id (o): - 3737018965 3737018966 IN IP4 192.168.1.143
                Owner Username: -
                Session ID: 3737018965
                Session Version: 3737018966
                Owner Network Type: IN
                Owner Address Type: IP4
                Owner Address: 192.168.1.143
            Session Name (s): pjmedia
            Bandwidth Information (b): AS:352
                Bandwidth Modifier: AS [Application Specific (RTP session bandwidth)]
                Bandwidth Value: 352 kb/s
            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 6562 RTP/AVP 0 101
                Media Type: audio
                Media Port: 6562
                Media Protocol: RTP/AVP
                Media Format: ITU-T G.711 PCMU
                Media Format: DynamicRTP-Type-101
            Connection Information (c): IN IP4 192.168.1.150
                Connection Network Type: IN
                Connection Address Type: IP4
                Connection Address: 192.168.1.150
            Bandwidth Information (b): TIAS:64000
                Bandwidth Modifier: TIAS [Transport Independent Application Specific maximum]
                Bandwidth Value: 64000 b/s
            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 0-16
                Media Attribute Fieldname: fmtp
                Media Format: 101 [telephone-event]
                Media format specific parameters: 0-16
            Media Attribute (a): sendrecv
            Media Attribute (a): rtcp:6563
                Media Attribute Fieldname: rtcp
            Media Attribute (a): candidate:bUk2ovil6hV10uPc 1 UDP 2130706431 192.168.1.150 6562 typ host
                Media Attribute Fieldname: candidate
                Foundation: bUk2ovil6hV10uPc
                Component ID: 1
                Transport: UDP
                Priority: 2130706431
                Connection Address: 192.168.1.150
                Candidate Port: 6562
                Candidate Type: host (Host candidate)
            Media Attribute (a): candidate:bUk2ovil6hV10uPc 2 UDP 2130706430 192.168.1.150 6563 typ host
                Media Attribute Fieldname: candidate
                Foundation: bUk2ovil6hV10uPc
                Component ID: 2
                Transport: UDP
                Priority: 2130706430
                Connection Address: 192.168.1.150
                Candidate Port: 6563
                Candidate Type: host (Host candidate)
            Media Description, name and address (m): video 6590 RTP/AVP 99
                Media Type: video
                Media Port: 6590
                Media Protocol: RTP/AVP
                Media Format: DynamicRTP-Type-99
            Connection Information (c): IN IP4 192.168.1.150
                Connection Network Type: IN
                Connection Address Type: IP4
                Connection Address: 192.168.1.150
            Bandwidth Information (b): TIAS:256000
                Bandwidth Modifier: TIAS [Transport Independent Application Specific maximum]
                Bandwidth Value: 256000 b/s
            Media Attribute (a): rtpmap:99 H264/90000
                Media Attribute Fieldname: rtpmap
                Media Format: 99
                MIME Type: H264
                Sample Rate: 90000
            Media Attribute (a): fmtp:99 profile-level-id=428014; packetization-mode=1
                Media Attribute Fieldname: fmtp
                Media Format: 99 [H264]
                Media format specific parameters: profile-level-id=428014
                    Profile: 428014
                        0100 0010 = Profile_idc: Baseline profile (66)
                        1... .... = Constraint_set0_flag: 1
                        .0.. .... = Constraint_set1_flag: 0
                        ..0. .... = Constraint_set2_flag: 0
                        ...0 .... = Constraint_set3_flag: 0
                        .... 0... = Constraint_set4_flag: 0
                        .... .0.. = Constraint_set5_flag: 0
                        .... ..00 = Reserved_zero_2bits: 0
                        0001 0100 = Level_id: 20 [Level 2.0 2 Mb/s]
                Media format specific parameters: packetization-mode=1
                    [Packetization mode: Non-interleaved mode (1)]
            Media Attribute (a): recvonly
            Media Attribute (a): rtcp:6591
                Media Attribute Fieldname: rtcp
            Media Attribute (a): candidate:bUk2ovil6hV10uPc 1 UDP 2130706431 192.168.1.150 6590 typ host
                Media Attribute Fieldname: candidate
                Foundation: bUk2ovil6hV10uPc
                Component ID: 1
                Transport: UDP
                Priority: 2130706431
                Connection Address: 192.168.1.150
                Candidate Port: 6590
                Candidate Type: host (Host candidate)
            Media Attribute (a): candidate:bUk2ovil6hV10uPc 2 UDP 2130706430 192.168.1.150 6591 typ host
                Media Attribute Fieldname: candidate
                Foundation: bUk2ovil6hV10uPc
                Component ID: 2
                Transport: UDP
                Priority: 2130706430
                Connection Address: 192.168.1.150
                Candidate Port: 6591
                Candidate Type: host (Host candidate)

  43848 12:49:34.444344    192.168.1.150         192.168.1.155         RTP      216    PT=ITU-T G.711 PCMU, SSRC=0x6C1C59C2, Seq=6620, Time=800

Frame 43848: 216 bytes on wire (1728 bits), 216 bytes captured (1728 bits)
    Encapsulation type: Linux cooked-mode capture (25)
    Arrival Time: Jun  3, 2018 14:49:34.444344000 CEST
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1528030174.444344000 seconds
    [Time delta from previous captured frame: 0.000067000 seconds]
    [Time delta from previous displayed frame: 0.000067000 seconds]
    [Time since reference or first frame: 21839.020230000 seconds]
    Frame Number: 43848
    Frame Length: 216 bytes (1728 bits)
    Capture Length: 216 bytes (1728 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: sll:ethertype:ip:udp:rtp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Linux cooked capture
    Packet type: Sent by us (4)
    Link-layer address type: 1
    Link-layer address length: 6
    Source: Raspberr_fb:99:9f (b8:27:eb:fb:99:9f)
    Unused: 3632
    Protocol: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.1.150, Dst: 192.168.1.155
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 200
    Identification: 0x3c30 (15408)
    Flags: 0x4000, Don't fragment
        0... .... .... .... = Reserved bit: Not set
        .1.. .... .... .... = Don't fragment: Set
        ..0. .... .... .... = More fragments: Not set
        ...0 0000 0000 0000 = Fragment offset: 0
    Time to live: 64
    Protocol: UDP (17)
    Header checksum: 0x7973 [validation disabled]
    [Header checksum status: Unverified]
    Source: 192.168.1.150
    Destination: 192.168.1.155
User Datagram Protocol, Src Port: 6562, Dst Port: 5004
    Source Port: 6562
    Destination Port: 5004
    Length: 180
    Checksum: 0x8547 [unverified]
    [Checksum Status: Unverified]
    [Stream index: 2114]
Real-Time Transport Protocol
    [Stream setup by SDP (frame 43776)]
        [Setup frame: 43776]
        [Setup Method: SDP]
    10.. .... = Version: RFC 1889 Version (2)
    ..0. .... = Padding: False
    ...0 .... = Extension: False
    .... 0000 = Contributing source identifiers count: 0
    0... .... = Marker: False
    Payload type: ITU-T G.711 PCMU (0)
    Sequence number: 6620
    [Extended sequence number: 72156]
    Timestamp: 800
    Synchronization Source identifier: 0x6c1c59c2 (1813797314)
    Payload: 2c47b9b4bbe840f1b9b5c8392b36ccb4b9de3c3e73d25a3a...

  43849 12:49:34.445195    192.168.1.1           192.168.1.150         UDP      216    4000 → 6542 Len=172

Frame 43849: 216 bytes on wire (1728 bits), 216 bytes captured (1728 bits)
    Encapsulation type: Linux cooked-mode capture (25)
    Arrival Time: Jun  3, 2018 14:49:34.445195000 CEST
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1528030174.445195000 seconds
    [Time delta from previous captured frame: 0.000851000 seconds]
    [Time delta from previous displayed frame: 0.000851000 seconds]
    [Time since reference or first frame: 21839.021081000 seconds]
    Frame Number: 43849
    Frame Length: 216 bytes (1728 bits)
    Capture Length: 216 bytes (1728 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: sll:ethertype:ip:udp:data]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Linux cooked capture
    Packet type: Unicast to us (0)
    Link-layer address type: 1
    Link-layer address length: 6
    Source: Cisco-Li_f4:20:19 (98:fc:11:f4:20:19)
    Unused: 6d61
    Protocol: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.1.1, Dst: 192.168.1.150
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 200
    Identification: 0x3bc7 (15303)
    Flags: 0x4000, Don't fragment
        0... .... .... .... = Reserved bit: Not set
        .1.. .... .... .... = Don't fragment: Set
        ..0. .... .... .... = More fragments: Not set
        ...0 0000 0000 0000 = Fragment offset: 0
    Time to live: 63
    Protocol: UDP (17)
    Header checksum: 0x7b76 [validation disabled]
    [Header checksum status: Unverified]
    Source: 192.168.1.1
    Destination: 192.168.1.150
User Datagram Protocol, Src Port: 4000, Dst Port: 6542
    Source Port: 4000
    Destination Port: 6542
    Length: 180
    Checksum: 0x5fe4 [unverified]
    [Checksum Status: Unverified]
    [Stream index: 2112]
Data (172 bytes)

0000  80 00 19 dd 00 00 03 c0 6c 1c 59 c2 c8 c8 6b df   ........l.Y...k.
0010  ef ec ed ef ef f3 f3 f7 f6 f9 fa fd fb fd fe fe   ................
0020  7e 7e 7e 7e 7c 7d 7c 7c 7c 7d 7c 7d 7d 7c 7c 7d   ~~~~|}|||}|}}||}
0030  7c 7c 7d 7e 7d 7d ff 7e 7d 7e 7e 7e 7e fe ff 7d   ||}~}}.~}~~~~..}
0040  ff ff 7e ff ff ff fe ff 7e fe fe 7e 7e fe 7e 7e   ..~.....~..~~.~~
0050  ff ff ff ff ff ff 7e ff ff 7e ff 7e ff 7e ff 7e   ......~..~.~.~.~
0060  7e 7e ff 7e 7e 7e 7e ff ff 7e 7e 7e 7e 7e 7e 7e   ~~.~~~~..~~~~~~~
0070  7e 7e ff 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e   ~~.~~~~~~~~~~~~~
0080  7e 7e 7e ff 7e 7e 7e 7e ff 7e ff 7e ff 7e ff 7e   ~~~.~~~~.~.~.~.~
0090  ff 7e ff ff 7e 7e ff 7e 7e ff ff ff 7e ff 7e 7e   .~..~~.~~...~.~~
00a0  7e ff ff ff ff ff 7e 7e ff 7e ff 7e               ~.....~~.~.~
    Data: 800019dd000003c06c1c59c2c8c86bdfefecedefeff3f3f7...
    [Length: 172]

  43850 12:49:34.445266    192.168.1.150         192.168.1.155         RTP      216    PT=ITU-T G.711 PCMU, SSRC=0x6C1C59C2, Seq=6621, Time=960

Frame 43850: 216 bytes on wire (1728 bits), 216 bytes captured (1728 bits)
    Encapsulation type: Linux cooked-mode capture (25)
    Arrival Time: Jun  3, 2018 14:49:34.445266000 CEST
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1528030174.445266000 seconds
    [Time delta from previous captured frame: 0.000071000 seconds]
    [Time delta from previous displayed frame: 0.000071000 seconds]
    [Time since reference or first frame: 21839.021152000 seconds]
    Frame Number: 43850
    Frame Length: 216 bytes (1728 bits)
    Capture Length: 216 bytes (1728 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: sll:ethertype:ip:udp:rtp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Linux cooked capture
    Packet type: Sent by us (4)
    Link-layer address type: 1
    Link-layer address length: 6
    Source: Raspberr_fb:99:9f (b8:27:eb:fb:99:9f)
    Unused: 0800
    Protocol: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.1.150, Dst: 192.168.1.155
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 200
    Identification: 0x3c31 (15409)
    Flags: 0x4000, Don't fragment
        0... .... .... .... = Reserved bit: Not set
        .1.. .... .... .... = Don't fragment: Set
        ..0. .... .... .... = More fragments: Not set
        ...0 0000 0000 0000 = Fragment offset: 0
    Time to live: 64
    Protocol: UDP (17)
    Header checksum: 0x7972 [validation disabled]
    [Header checksum status: Unverified]
    Source: 192.168.1.150
    Destination: 192.168.1.155
User Datagram Protocol, Src Port: 6562, Dst Port: 5004
    Source Port: 6562
    Destination Port: 5004
    Length: 180
    Checksum: 0x8547 [unverified]
    [Checksum Status: Unverified]
    [Stream index: 2114]
Real-Time Transport Protocol
    [Stream setup by SDP (frame 43776)]
        [Setup frame: 43776]
        [Setup Method: SDP]
    10.. .... = Version: RFC 1889 Version (2)
    ..0. .... = Padding: False
    ...0 .... = Extension: False
    .... 0000 = Contributing source identifiers count: 0
    0... .... = Marker: False
    Payload type: ITU-T G.711 PCMU (0)
    Sequence number: 6621
    [Extended sequence number: 72157]
    Timestamp: 960
    Synchronization Source identifier: 0x6c1c59c2 (1813797314)
    Payload: c8c86bdfefecedefeff3f3f7f6f9fafdfbfdfefe7e7e7e7e...

  43851 12:49:34.446600    192.168.1.155         192.168.1.150         SIP      1182   Request: ACK sip:004521176217 at 192.168.1.1:51850;transport=TCP;ob | 

Frame 43851: 1182 bytes on wire (9456 bits), 1182 bytes captured (9456 bits)
    Encapsulation type: Linux cooked-mode capture (25)
    Arrival Time: Jun  3, 2018 14:49:34.446600000 CEST
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1528030174.446600000 seconds
    [Time delta from previous captured frame: 0.001334000 seconds]
    [Time delta from previous displayed frame: 0.001334000 seconds]
    [Time since reference or first frame: 21839.022486000 seconds]
    Frame Number: 43851
    Frame Length: 1182 bytes (9456 bits)
    Capture Length: 1182 bytes (9456 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: sll:ethertype:ip:udp:sip]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Linux cooked capture
    Packet type: Unicast to us (0)
    Link-layer address type: 1
    Link-layer address length: 6
    Source: Grandstr_b9:a9:a4 (00:0b:82:b9:a9:a4)
    Unused: 6633
    Protocol: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.1.155, Dst: 192.168.1.150
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 1166
    Identification: 0xe505 (58629)
    Flags: 0x0000
        0... .... .... .... = Reserved bit: Not set
        .0.. .... .... .... = Don't fragment: Not set
        ..0. .... .... .... = More fragments: Not set
        ...0 0000 0000 0000 = Fragment offset: 0
    Time to live: 64
    Protocol: UDP (17)
    Header checksum: 0x0cd8 [validation disabled]
    [Header checksum status: Unverified]
    Source: 192.168.1.155
    Destination: 192.168.1.150
User Datagram Protocol, Src Port: 5060, Dst Port: 5069
    Source Port: 5060
    Destination Port: 5069
    Length: 1146
    Checksum: 0x0975 [unverified]
    [Checksum Status: Unverified]
    [Stream index: 3]
Session Initiation Protocol (ACK)
    Request-Line: ACK sip:004521176217 at 192.168.1.1:51850;transport=TCP;ob SIP/2.0
        Method: ACK
        Request-URI: sip:004521176217 at 192.168.1.1:51850;transport=TCP;ob
            Request-URI User Part: 004521176217
            Request-URI Host Part: 192.168.1.1
            Request-URI Host Port: 51850
        [Resent Packet: False]
        [Request Frame: 43831]
        [Response Time (ms): 500]
    Message Header
        Via: SIP/2.0/UDP 192.168.1.155:5060;branch=z9hG4bK2039775016;rport
            Transport: UDP
            Sent-by Address: 192.168.1.155
            Sent-by port: 5060
            Branch: z9hG4bK2039775016
            RPort: rport
        Route: <sip:192.168.1.150:5069;lr;r2=on;ftag=851466465;vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-;did=096.e362;vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA-->
            Route URI: sip:192.168.1.150:5069;lr;r2=on;ftag=851466465;vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-;did=096.e362;vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA--
                Route Host Part: 192.168.1.150
                Route Host Port: 5069
                Route URI parameter: lr
                Route URI parameter: r2=on
                Route URI parameter: ftag=851466465
                Route URI parameter: vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-
                Route URI parameter: did=096.e362
                Route URI parameter: vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA--
        Route: <sip:127.0.0.1:5069;lr;r2=on;ftag=851466465;vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-;did=096.e362;vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA-->
            Route URI: sip:127.0.0.1:5069;lr;r2=on;ftag=851466465;vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-;did=096.e362;vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA--
                Route Host Part: 127.0.0.1
                Route Host Port: 5069
                Route URI parameter: lr
                Route URI parameter: r2=on
                Route URI parameter: ftag=851466465
                Route URI parameter: vsf=AAAAAFRFAXFxCAscHwcOFh8fHwQFDzUwNjk-
                Route URI parameter: did=096.e362
                Route URI parameter: vst=AAAAAAAABARyAAgFGAMHD24AHAYbABQFHgcDNTA3MA--
        Route: <sip:127.0.0.1:5070;lr;r2=on;ftag=851466465;vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i;nat=yes>
            Route URI: sip:127.0.0.1:5070;lr;r2=on;ftag=851466465;vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i;nat=yes
                Route Host Part: 127.0.0.1
                Route Host Port: 5070
                Route URI parameter: lr
                Route URI parameter: r2=on
                Route URI parameter: ftag=851466465
                Route URI parameter: vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i
                Route URI parameter: nat=yes
        Route: <sip:5.103.133.210:5070;transport=tcp;lr;r2=on;ftag=851466465;vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i;nat=yes>
            Route URI: sip:5.103.133.210:5070;transport=tcp;lr;r2=on;ftag=851466465;vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i;nat=yes
                Route Host Part: 5.103.133.210
                Route Host Port: 5070
                Route URI parameter: transport=tcp
                Route URI parameter: lr
                Route URI parameter: r2=on
                Route URI parameter: ftag=851466465
                Route URI parameter: vst=AAAAAAAAAAAAAAAAAAAAAAAACwUAARgIAAAUBAoCATg1MDt0cmFuc3BvcnQ9VENQO29i
                Route URI parameter: nat=yes
        From: "du1" <sip:du1 at 192.168.1.150:5069>;tag=851466465
            SIP Display info: "du1"
            SIP from address: sip:du1 at 192.168.1.150:5069
                SIP from address User Part: du1
                SIP from address Host Part: 192.168.1.150
                SIP from address Host Port: 5069
            SIP from tag: 851466465
        To: <sip:0001 at 192.168.1.150:5069>
            SIP to address: sip:0001 at 192.168.1.150:5069
                SIP to address User Part: 0001
                SIP to address Host Part: 192.168.1.150
                SIP to address Host Port: 5069
        Call-ID: 1347286846-5060-7 at BJC.BGI.B.BFF
        CSeq: 60 ACK
            Sequence Number: 60
            Method: ACK
        Contact: <sip:du1 at 192.168.1.155:5060>
            Contact URI: sip:du1 at 192.168.1.155:5060
                Contact URI User Part: du1
                Contact URI Host Part: 192.168.1.155
                Contact URI Host Port: 5060
        Max-Forwards: 70
        Supported: replaces, path, timer, eventlist
        User-Agent: Grandstream GDS3710 1.0.2.22
        Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE, MESSAGE
        Content-Length: 0


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