Tutorial: Voice over IP (VoIP), Session Initiation Protocol (SIP), Real-time Transport Protocol (RTP)

VOIP SIP RTP

This tutorial shows the capabilities of the plugin voipDetector. It displays troubleshooting information of SIP/RTP/RTCP and is able to carve RTP content.

Preparation

Before we start we need to prepare T2. If you did not complete the tutorials before just follow the procedure described below.

First I recommend to set T2 into a pristine state by removing all unnecessary or older plugins from the plugin folder ~/.tranalyzer/plugins. Just as a precaution if you have some old plugins or files there. If you like to keep them, please copy them away.

$ t2build -e
Are you sure you want to empty the plugin folder '/home/wurst/.tranalyzer/plugins' (y/N)? y
Plugin folder emptied
$
$ t2build tranalyzer2 basicFlow voipDetector txtSink
...
BUILD SUCCESSFUL

$

If you did not create a separate data and results directory yet, please do it now in another cmd window, that facilitates your workflow:

$ mkdir ~/data ~/results
$

Download the sample pcap from here: MagicJack_short_call.pcap. You may try these all as well. Now you’re all set.

voipDetector

This plugin was originally designed for troubleshooting of telco VOIP communication, therefore RTCP is also decoded which provides additional statistics to the basicStats plugin, such as packets lost and maximal jitter reporting.

Data carving with voipDetector

The configuration listed below, allows the user to enable the RTP content save mode, the length of SIP names in the flow structure, the path where RTP content is saved and the default name as a prefix if no file name can be found.

We also added an configurable offset in the payload of RTP, for special purpose applications.

$ voipDetector
$ vi src/voipDetector.h

For now we switch on VOIP_SAVE=1 and keep VOIP_RMDIR=0 as we like t2 to delete the files between experiments to rm clutter. If you like to keep the extracted files switch VOIP_RMDIR=1.

Use t2conf, recompile and engage t2 on the MagicJack pcap with the packet mode.

$ t2conf voipDetector -D VOIP_SAVE=1 && t2build voipDetector
...
$ t2 -r ~/test_data/data/MagicJack+_short_call.pcap -w ~/results/ -s
===============================================================================
Tranalyzer 0.8.10 (Anteater), Tarantula. PID: 14482
================================================================================
[INF] Creating flows for L2, IPv4, IPv6
Active plugins:
    01: basicFlow, 0.8.10
    02: voipDetector, 0.8.10
    03: txtSink, 0.8.10
[INF] IPv4 Ver: 5, Rev: 16122020, Range Mode: 0, subnet ranges loaded: 406077 (406.08 K)
[INF] IPv6 Ver: 5, Rev: 17122020, Range Mode: 0, subnet ranges loaded: 51069 (51.07 K)
Processing file: /home/wurst/data/MagicJack+_short_call.pcap
Link layer type: Ethernet [EN10MB/1]
Dump start: 1334245056.670292 sec (Thu 12 Apr 2012 15:37:36 GMT)
Dump stop : 1334245246.895631 sec (Thu 12 Apr 2012 15:40:46 GMT)
Total dump duration: 190.225339 sec (3m 10s)
Finished processing. Elapsed time: 0.014789 sec
Finished unloading flow memory. Time: 0.015024 sec
Percentage completed: 100.00%
Number of processed packets: 1381 (1.38 K)
Number of processed bytes: 293315 (293.31 K)
Number of raw bytes: 293315 (293.31 K)
Number of pad bytes: 130
Number of pcap bytes: 315435 (315.44 K)
Number of IPv4 packets: 1360 (1.36 K) [98.48%]
Number of A packets: 720 [52.14%]
Number of B packets: 661 [47.86%]
Number of A bytes: 152644 (152.64 K) [52.04%]
Number of B bytes: 140671 (140.67 K) [47.96%]
Average A packet load: 212.01
Average B packet load: 212.82
--------------------------------------------------------------------------------
voipDetector: Aggregated voipStat=0x0185
voipDetector: max fd count: : 2
voipDetector: Number of SIP/RTP/RTCP packets: 1287 (1.29 K) [93.19%]
--------------------------------------------------------------------------------
Headers count: min: 2, max: 3, average: 2.98
Number of GRE packets: 21 [1.52%]
Number of ICMP packets: 10 [0.72%]
Number of TCP packets: 31 [2.24%]
Number of TCP bytes: 4774 (4.77 K) [1.63%]
Number of UDP packets: 1319 (1.32 K) [95.51%]
Number of UDP bytes: 286559 (286.56 K) [97.70%]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Number of processed   flows: 22
Number of processed A flows: 15 [68.18%]
Number of processed B flows: 7 [31.82%]
Number of request     flows: 15 [68.18%]
Number of reply       flows: 7 [31.82%]
Total   A/B    flow asymmetry: 0.36
Total req/rply flow asymmetry: 0.36
Number of processed   packets/flows: 62.77
Number of processed A packets/flows: 48.00
Number of processed B packets/flows: 94.43
Number of processed total packets/s: 7.26
Number of processed A+B   packets/s: 7.26
Number of processed A     packets/s: 3.78
Number of processed   B   packets/s: 3.47
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Number of average processed flows/s: 0.12
Average full raw bandwidth: 12335 b/s (12.34 Kb/s)
Average full bandwidth : 12278 b/s (12.28 Kb/s)
Max number of flows in memory: 22 [0.01%]
Memory usage: 0.01 GB [0.02%]
Aggregated flowStat=0x0400100010004044
[WRN] Consecutive duplicate IP ID
[INF] Ethernet flows
[INF] IPv4 flows
[INF] ARP
[INF] SIP/RTP
$

The end report tells you that RTP, SIP are detected and he found 2 voice comms being written to your /tmp/TranVoIP/ directory.

$ tawk -V voipStat=0x0185
The voipStat column with value 0x0185 is to be interpreted as follows:

   bit | voipStat | Description
   =============================================================================
     0 | 0x0001     | RTP detected
     2 | 0x0004     | SIP detected
     7 | 0x0080     | RTP marker
     8 | 0x0100     | RTP content write operation

First look at the flow file, you see the flows labelled as SIP, or RTP, certain SIP, RTP parameters and the names of extracted content.

$ cd ~/results
$ tcol MagicJack+_short_flows.txt
%dir  flowInd  flowStat            timeFirst          timeLast           duration    numHdrDesc  numHdrs  hdrDesc        srcMac             dstMac             ethType  ethVlanID  srcIP          srcIPCC  srcIPOrg                    srcPort  dstIP          dstIPCC  dstIPOrg                    dstPort  l4Proto  voipStat  voipTyp  voipID      voipSRCnt  voipPMCnt  voipPMr  voipSIPStatCnt  voipSIPReqCnt  voipUsrAgnt  voipSIPCID                  voipSIPStat          voipSIPReq       voipTPCnt  voipTBCnt  voipFracLst  voipCPMCnt  voipMaxIAT  voipFname
A     7        0x0000000000000044  1334245104.331341  1334245104.331341  0.000000    1           2        eth:arp        00:0e:53:1c:7e:b2  ff:ff:ff:ff:ff:ff  0x0806              -              -        "-"                         0        -              -        "-"                         0        0        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     3        0x0000000000000044  1334245061.682774  1334245220.746608  159.063834  1           2        eth:arp        68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0806              -              -        "-"                         0        -              -        "-"                         0        0        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
B     3        0x0000000000000045  1334245061.683269  1334245220.747090  159.063821  1           2        eth:arp        6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0806              -              -        "-"                         0        -              -        "-"                         0        0        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     8        0x0400000000004000  1334245222.765593  1334245235.575661  12.810068   1           3        eth:ipv4:udp   6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800              192.168.0.10   07       "Private network"           49154    216.234.64.16  us       "Ymax Communications Corp"  54550    17       0x0181    0        0x2a173650  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           "/tmp/TranVoIP/nudel_2a173650_8_A_G711u.raw"
B     8        0x0400100000004001  1334245222.821580  1334245235.307648  12.486068   1           3        eth:ipv4:udp   68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800              216.234.64.16  us       "Ymax Communications Corp"  54550    192.168.0.10   07       "Private network"           49154    17       0x0101    0        0x31be1e0e  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           "/tmp/TranVoIP/nudel_31be1e0e_8_B_G711u.raw"
A     4        0x0400000000004000  1334245062.390891  1334245235.625275  173.234384  1           3        eth:ipv4:udp   6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800              192.168.0.10   07       "Private network"           59205    216.234.64.8   us       "Ymax Communications Corp"  5070     17       0x0004             0x00000000  0          0          0        1               4              ""           ""                          200                  INV;ACK;INV;ACK  0          0          0            0           0           ""
B     4        0x0400100000004001  1334245215.755652  1334245235.514488  19.758836   1           3        eth:ipv4:udp   68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800              216.234.64.8   us       "Ymax Communications Corp"  5070     192.168.0.10   07       "Private network"           59205    17       0x0004             0x00000000  0          0          0        5               1              ""           "9055551212@talk4free.com"  100;401;100;183;200  BYE              0          0          0            0           0           ""
A     1        0x0400000000004000  1334245056.670292  1334245236.655187  179.984895  1           3        eth:ipv4:icmp  6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800              192.168.0.10   07       "Private network"           0        192.168.0.1    07       "Private network"           0        1        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
B     1        0x0400000000004001  1334245056.686806  1334245236.671664  179.984858  1           3        eth:ipv4:icmp  68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800              192.168.0.1    07       "Private network"           0        192.168.0.10   07       "Private network"           0        1        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     6        0x0000000000000044  1334245068.782499  1334245241.665789  172.883290  1           2        eth:arp        68:7f:74:1d:5f:eb  00:16:ec:e2:0d:f8  0x0806              -              -        "-"                         0        -              -        "-"                         0        0        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
B     6        0x0000000000000045  1334245068.782544  1334245241.665836  172.883292  1           2        eth:arp        00:16:ec:e2:0d:f8  68:7f:74:1d:5f:eb  0x0806              -              -        "-"                         0        -              -        "-"                         0        0        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     5        0x0400000000004000  1334245067.177032  1334245246.583157  179.406125  1           3        eth:ipv4:udp   00:09:6b:bf:ae:7d  ff:ff:ff:ff:ff:ff  0x0800              192.168.0.4    07       "Private network"           138      192.168.0.15   07       "Private network"           138      17       0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     9        0x0400000000004000  1334245246.582974  1334245246.583443  0.000469    1           3        eth:ipv4:udp   00:16:ec:e2:0d:f8  ff:ff:ff:ff:ff:ff  0x0800              192.168.0.2    07       "Private network"           138      192.168.0.15   07       "Private network"           138      17       0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     11       0x0000000000000044  1334245246.604931  1334245246.604931  0.000000    1           2        eth:arp        00:16:ec:e2:0d:f8  ff:ff:ff:ff:ff:ff  0x0806              -              -        "-"                         0        -              -        "-"                         0        0        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     12       0x0000000000000044  1334245246.604940  1334245246.604940  0.000000    1           2        eth:arp        00:09:6b:bf:ae:7d  00:16:ec:e2:0d:f8  0x0806              -              -        "-"                         0        -              -        "-"                         0        0        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     10       0x0400000000004000  1334245246.604739  1334245246.608019  0.003280    1           3        eth:ipv4:udp   00:09:6b:bf:ae:7d  ff:ff:ff:ff:ff:ff  0x0800              192.168.0.4    07       "Private network"           137      192.168.0.15   07       "Private network"           137      17       0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     13       0x0400000000004000  1334245246.605043  1334245246.608186  0.003143    1           3        eth:ipv4:udp   00:16:ec:e2:0d:f8  00:09:6b:bf:ae:7d  0x0800              192.168.0.2    07       "Private network"           137      192.168.0.4    07       "Private network"           137      17       0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     15       0x0400000000004000  1334245246.608310  1334245246.608310  0.000000    1           3        eth:ipv4:icmp  00:09:6b:bf:ae:7d  00:16:ec:e2:0d:f8  0x0800              192.168.0.4    07       "Private network"           0        192.168.0.2    07       "Private network"           0        1        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
B     15       0x0400000000004001  1334245246.608429  1334245246.608429  0.000000    1           3        eth:ipv4:icmp  00:16:ec:e2:0d:f8  00:09:6b:bf:ae:7d  0x0800              192.168.0.2    07       "Private network"           0        192.168.0.4    07       "Private network"           0        1        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     2        0x0400100000004000  1334245056.687467  1334245246.665263  189.977796  1           3        eth:ipv4:udp   68:7f:74:1d:5f:eb  00:16:ec:e2:0d:f8  0x0800              192.168.0.1    07       "Private network"           32772    192.168.0.2    07       "Private network"           2972     17       0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
A     14       0x0400000000004000  1334245246.605115  1334245246.895631  0.290516    1           3        eth:ipv4:tcp   00:09:6b:bf:ae:7d  00:16:ec:e2:0d:f8  0x0800              192.168.0.4    07       "Private network"           2139     192.168.0.2    07       "Private network"           139      6        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""
B     14       0x0400000000004001  1334245246.605293  1334245246.745603  0.140310    1           3        eth:ipv4:tcp   00:16:ec:e2:0d:f8  00:09:6b:bf:ae:7d  0x0800              192.168.0.2    07       "Private network"           139      192.168.0.4    07       "Private network"           2139     6        0x0000             0x00000000  0          0          0        0               0              ""           ""                                                                0          0          0            0           0           ""

The file name coding denotes the VoIP ID, type of codec, compression type and which flow, so that each file can be linked back to the originating flow and vice versa.

/directory/default name_voipID_flowIndex_A|B_CodecCoding.raw

Similar info is available in the packet file, were you can also track sequence numbers and IDs.

$ tcol MagicJack+_short_packets.txt
%pktNo  flowInd  flowStat            time               pktIAT    flowDuration  numHdrs  hdrDesc        ethVlanID  srcMac             dstMac             ethType  srcIP         srcIPCC  srcIPOrg         srcPort  dstIP         dstIPCC  dstIPOrg         dstPort  l4Proto  voipStat  voipType  voipSeqN  voipID  l7Content
...
44      6        0x0000000000000045  1334245210.507043  28.838831  141.724503    2        eth:arp                   00:16:ec:e2:0d:f8  68:7f:74:1d:5f:eb  0x0806                                                                                                                                                                            ............\r.....h.t._.......................
45      2        0x0400100000004000  1334245211.522083  5.763982   154.834610    3        eth:ipv4:udp              68:7f:74:1d:5f:eb  00:16:ec:e2:0d:f8  0x0800   192.168.0.1    07       Private network           32772    192.168.0.2    07       Private network           2972     17                                                 <12>Apr 12 11:40:10 kernel: DROP IN=ppp0 OUT= MAC= SRC=108.173.102.108 DST=206.248.161.77 LEN=48 TOS=0x00 PREC=0x00 TTL=118 ID=419 DF PROTO=TCP SPT=64590 DPT=27488 SEQ=3689285428 ACK=0 WINDOW=8192 RES=0x00 SYN URGP=0 OPT (020405AC01010402) \n
46      4        0x0400000000004000  1334245215.711324  13.332198  153.320435    3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           59205    216.234.64.8   us       Ymax Communications Corp  5070     17       0x0004                                    INVITE sip:9055551212@talk4free.com SIP/2.0\r\nVia: SIP/2.0/UDP 192.168.0.10:59205;branch=z9hG4bKc0a8000a052181bc3f7ea3253c;rport\r\nFrom: "unknown" <sip:E646657195201@talk4free.com>;tag=2afc8c735218176\r\nTo: <sip:9055551212@talk4free.com>\r\nContact: <sip:E646657195201@192.168.0.10:59205>\r\nCall-ID: C5570127C1A6A1ABF7ED9DB9AD608CE00xc0a8000a\r\nCSeq: 1 INVITE\r\nMax-Forwards: 70\r\nUser-Agent: mJ/2.00.632b.11054E4\r\nContent-Length: 307\r\nContent-Type: application/sdp\r\nMin-SE: 90\r\nSession-Expires: 600;refresher=uac\r\nSupported: replaces,norefersub,timer\r\nX-NATType: bPrUmtdEXuiRekQWte1LXTKJ3VNrFPndz3Ft8rPs5TPM7DDT5Nxsa+bhj/YTWmRM\r\n\r\nv=0\r\no=- 2209074887 2209074887 IN IP4 192.168.0.10\r\ns=SJphone\r\nc=IN IP4 192.168.0.10\r\nt=0 0\r\nm=audio 49154 RTP/AVP 0 8 101 13\r\nc=IN IP4 192.168.0.10\r\na=ptime:30\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:8 PCMA/8000\r\na=rtpmap:101 telephone-event/8000\r\na=fmtp:101 0-16\r\na=rtpmap:13 CN/8000\r\na=setup:active\r\na=sendrecv\r\n
47      4        0x0400000000004001  1334245215.755652  0.000000   0.000000      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.8   us       Ymax Communications Corp  5070     192.168.0.10   07       Private network           59205    17       0x0004                                    SIP/2.0 100 Trying\r\nVia: SIP/2.0/UDP 192.168.0.10:59205;branch=z9hG4bKc0a8000a052181bc3f7ea3253c;rport=59205;received=206.248.161.77\r\nTo: <sip:9055551212@talk4free.com>\r\nFrom: "unknown"<sip:E646657195201@talk4free.com>;tag=2afc8c735218176\r\nCall-ID: C5570127C1A6A1ABF7ED9DB9AD608CE00xc0a8000a\r\nCSeq: 1 INVITE\r\nContent-Length: 0\r\n\r\n
48      4        0x0400000000004001  1334245215.769396  0.013744   0.013744      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.8   us       Ymax Communications Corp  5070     192.168.0.10   07       Private network           59205    17       0x0004                                    SIP/2.0 401 Unauthorized\r\nVia: SIP/2.0/UDP 192.168.0.10:59205;branch=z9hG4bKc0a8000a052181bc3f7ea3253c;rport=59205;received=206.248.161.77\r\nTo: <sip:9055551212@talk4free.com>\r\nFrom: "unknown"<sip:E646657195201@talk4free.com>;tag=2afc8c735218176\r\nCall-ID: C5570127C1A6A1ABF7ED9DB9AD608CE00xc0a8000a\r\nCSeq: 1 INVITE\r\nDate: Thu, 12 Apr 2012 15:40:15 GMT\r\nUser-Agent: ENSR3.2.21.22-IS15-RMRG0-RG900-EP\r\nWWW-Authenticate: Digest nonce="30da0aed2_12170",realm="stratus.com",algorithm=MD5\r\nContent-Length: 0\r\n\r\n
49      4        0x0400000000004000  1334245215.882668  0.171344   153.491776    3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           59205    216.234.64.8   us       Ymax Communications Corp  5070     17       0x0004                                    ACK sip:9055551212@talk4free.com SIP/2.0\r\nVia: SIP/2.0/UDP 192.168.0.10:59205;branch=z9hG4bKc0a8000a052181bc3f7ea3253c;rport\r\nFrom: "unknown" <sip:E646657195201@talk4free.com>;tag=2afc8c735218176\r\nTo: <sip:9055551212@talk4free.com>\r\nCall-ID: C5570127C1A6A1ABF7ED9DB9AD608CE00xc0a8000a\r\nCSeq: 1 ACK\r\nMax-Forwards: 70\r\nUser-Agent: mJ/2.00.632b.11054E4\r\nContent-Length: 0\r\n\r\n
50      4        0x0400000000004000  1334245215.884964  0.002296   153.494080    3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           59205    216.234.64.8   us       Ymax Communications Corp  5070     17       0x0004                                    INVITE sip:9055551212@talk4free.com SIP/2.0\r\nVia: SIP/2.0/UDP 192.168.0.10:59205;branch=z9hG4bKc0a8000a052182706faf2cbf3d;rport\r\nFrom: "unknown" <sip:E646657195201@talk4free.com>;tag=2afc8c735218176\r\nTo: <sip:9055551212@talk4free.com>\r\nContact: <sip:E646657195201@192.168.0.10:59205>\r\nCall-ID: C5570127C1A6A1ABF7ED9DB9AD608CE00xc0a8000a\r\nCSeq: 2 INVITE\r\nMax-Forwards: 70\r\nUser-Agent: mJ/2.00.632b.11054E4\r\nAuthorization: Digest username="E646657195201",realm="stratus.com",nonce="30da0aed2_12170",uri="sip:9055551212@talk4free.com",response="329e0b8a19bad6f3098c21cd11ec7979",algorithm=MD5\r\nContent-Length: 307\r\nContent-Type: application/sdp\r\nMin-SE: 90\r\nSession-Expires: 600;refresher=uac\r\nSupported: replaces,norefersub,timer\r\nX-NATType: bPrUmtdEXuiRekQWte1LXTKJ3VNrFPndz3Ft8rPs5TPM7DDT5Nxsa+bhj/YTWmRM\r\n\r\nv=0\r\no=- 2209074887 2209074887 IN IP4 192.168.0.10\r\ns=SJphone\r\nc=IN IP4 192.168.0.10\r\nt=0 0\r\nm=audio 49154 RTP/AVP 0 8 101 13\r\nc=IN IP4 192.168.0.10\r\na=ptime:30\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:8 PCMA/8000\r\na=rtpmap:101 telephone-event/8000\r\na=fmtp:101 0-16\r\na=rtpmap:13 CN/8000\r\na=setup:active\r\na=sendrecv\r\n
51      4        0x0400100000004001  1334245215.931983  0.162587   0.176331      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.8   us       Ymax Communications Corp  5070     192.168.0.10   07       Private network           59205    17       0x0004                                    SIP/2.0 100 Trying\r\nVia: SIP/2.0/UDP 192.168.0.10:59205;branch=z9hG4bKc0a8000a052182706faf2cbf3d;rport=59205;received=206.248.161.77\r\nTo: <sip:9055551212@talk4free.com>\r\nFrom: "unknown"<sip:E646657195201@talk4free.com>;tag=2afc8c735218176\r\nCall-ID: C5570127C1A6A1ABF7ED9DB9AD608CE00xc0a8000a\r\nCSeq: 2 INVITE\r\nContent-Length: 0\r\n\r\n
52      3        0x0000000000000044  1334245220.746608  39.078480  159.063828    2        eth:arp                   68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0806                                                                                                                                                                            ........h.t._..............\n...............m..
53      3        0x0000000000000045  1334245220.747090  39.078465  159.063828    2        eth:arp                   6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0806                                                                                                                                                                            ........l3.aM....\nh.t._....................m..
54      4        0x0400100000004001  1334245222.700515  6.768532   6.944863      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.8   us       Ymax Communications Corp  5070     192.168.0.10   07       Private network           59205    17       0x0004                                    SIP/2.0 183 Session Progress\r\nVia: SIP/2.0/UDP 192.168.0.10:59205;branch=z9hG4bKc0a8000a052182706faf2cbf3d;rport=59205;received=206.248.161.77\r\nContact: <sip:4165551212@216.234.64.8:5070>\r\nTo: <sip:9055551212@talk4free.com>;tag=30da0aed-co12170-INS015\r\nFrom: "unknown"<sip:E646657195201@talk4free.com>;tag=2afc8c735218176\r\nCall-ID: C5570127C1A6A1ABF7ED9DB9AD608CE00xc0a8000a\r\nCSeq: 2 INVITE\r\nContent-Type: application/sdp\r\nDate: Thu, 12 Apr 2012 15:40:21 GMT\r\nUser-Agent: ENSR3.2.21.22-IS15-RMRG5002-RG900-EP-CPI15-CPO25791\r\nContent-Length: 236\r\nX-Number-Type: 9055551212;type=off-net\r\n\r\nv=0\r\no=- 819596013 819596013 IN IP4 216.234.64.8\r\ns=ENSResip\r\nc=IN IP4 216.234.64.16\r\nt=0 0\r\nm=audio 54550 RTP/AVP 0 101\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:101 telephone-event/8000\r\na=fmtp:101 0-11\r\na=ptime:20\r\na=setup:active\r\na=sendrecv\r\n
55      8        0x0400000000004000  1334245222.765593  0.000000   0.000000      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0081    0         26528     0x2a173650  ..g.....*.6P.~.~~~~.....~~~~~...~...~}}~.....~~.~}~.....~~}~...~.....~~.~...~}~..~......~}}~.~..~...~~~~....~.~~~~...~..~}}...~....~~~~~..~~....~.~.....~~~~~~.....~~}.~....
56      2        0x0400100000004000  1334245222.779378  11.257295  166.091904    3        eth:ipv4:udp              68:7f:74:1d:5f:eb  00:16:ec:e2:0d:f8  0x0800   192.168.0.1    07       Private network           32772    192.168.0.2    07       Private network           2972     17                                                 <12>Apr 12 11:40:21 kernel: ACCEPT IN=br0 OUT=ppp0 SRC=192.168.0.10 DST=216.234.64.16 LEN=200 TOS=0x00 PREC=0x00 TTL=63 ID=11188 PROTO=UDP SPT=49154 DPT=54550 LEN=180 \n
57      8        0x0400000000004000  1334245222.795663  0.030070   0.030070      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26529     0x2a173650  ..g.....*.6P.~~..~.~~.....~.~......~~~~~.~~.....~~.~....~~~~~.~...~.~~~~....~..~.}~.~...~~~~~~.~...~~~}~..~..~.~~~~....~....~.....~~~~~~}~.....~.~~~......~~..~~....~.~~~.~.
58      8        0x0400000000004000  1334245222.796902  0.001239   0.031309      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26530     0x2a173650  ..g....@*.6P..~~~~.~~~...~}~.~......~}}~......~~~~~~~~..~~~.~...~~.~~~.~}~~~~..~.~~.......~~~.~....~.~~~...~..~.~~....~....~~...~.....~~~.~~...~~~~.~~...~~~}.~......~.~~~~.
59      8        0x0400000000004001  1334245222.821580  0.000000   0.000000      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0001    0         18437     0x31be1e0e  ..H.iuv.1..........J8/,,.5B.........Y<1,+,0;V.........D6.,,/8I.........P<3/.07Ci........lG;535:BX.........VF?<=?HV.........mYPNNPXau.................waWOMMOWj.........WH?<<
60      2        0x0400100000004000  1334245222.822292  0.042914   166.134827    3        eth:ipv4:udp              68:7f:74:1d:5f:eb  00:16:ec:e2:0d:f8  0x0800   192.168.0.1    07       Private network           32772    192.168.0.2    07       Private network           2972     17                                                 <12>Apr 12 11:40:22 kernel: ACCEPT IN=br0 OUT=ppp0 SRC=192.168.0.10 DST=216.234.64.16 LEN=200 TOS=0x00 PREC=0x00 TTL=63 ID=11189 PROTO=UDP SPT=49154 DPT=54550 LEN=180 \n
61      2        0x0400100000004000  1334245222.822473  0.000181   166.135010    3        eth:ipv4:udp              68:7f:74:1d:5f:eb  00:16:ec:e2:0d:f8  0x0800   192.168.0.1    07       Private network           32772    192.168.0.2    07       Private network           2972     17                                                 <12>Apr 12 11:40:22 kernel: ACCEPT IN=br0 OUT=ppp0 SRC=192.168.0.10 DST=216.234.64.16 LEN=200 TOS=0x00 PREC=0x00 TTL=63 ID=11190 PROTO=UDP SPT=49154 DPT=54550 LEN=180 \n
62      8        0x0400000000004000  1334245222.825426  0.028524   0.059833      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26531     0x2a173650  ..g.....*.6P..~~~~~~......~~~~....~}~~~~~....~..}~~~~...~..~...~....~~.~.~~~~..~~}~~~~..~.}~..~.....~~~~......~~.~...~.....~~..~~....~~~....~..~~~}~...~..~.}.........~~.~..
63      8        0x0400000000004001  1334245222.828270  0.006690   0.006690      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0101    0         18438     0x31be1e0e  ..H.iuwk1...>ET.........ZC:535:Ef........oD70..2;N.........K9/,,.5B.........Z<1,+,0;U.........D6.,,/8H.........Q<3/.07Bg........mG;635:BW.........WG?==?HV.........nZQNNQXau
64      8        0x0400100000004001  1334245222.848215  0.019945   0.026635      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0101    0         18439     0x31be1e0e  ..H.iux.1....................waVOMLOWj.........WH?<<>ES.........ZC:535:Ed........rD80..2;N.........K9/,,.5A|........[=1,+,0;T.........E6.,,/8H.........R=3/.07Bf........oG;6
65      8        0x0400000000004000  1334245222.855383  0.029957   0.089790      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26532     0x2a173650  ..g.....*.6P.~~.~.~~~..~~|..}~.......~}~.......~~~~~~..~.~~}~~......~~~~.~}~....~....~...~~~~~.~...~}}~~}~~~.........~~~}~..~.....~...}~}~.....~~.~}}....~.~~~~~......~~~...
66      8        0x0400000000004000  1334245222.856587  0.001204   0.090994      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26533     0x2a173650  ..g.... *.6P.}.~~.~.}.~~...~~}~.....}}........~~}~~.~~..~..~........~~}~.....~~~~~.....~~~~~~~...}..~}~.....~.}~.~...~~~..~~......~~~~~.~....~~~~..~....~~~.}}~~...~.~......
67      8        0x0400100000004001  1334245222.868178  0.019963   0.046598      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0101    0         18440     0x31be1e0e  ..H.iux.1...45:BV.........WG?==?HU.........nZQNNQXbu.................x`VOLLNWi.........WH?<<>DR.........[C:535:Dc........uE80..2;M.........K9/,,.4Ay........\=1,+,0;S.......
68      8        0x0400000000004000  1334245222.885435  0.028848   0.119842      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26534     0x2a173650  ..g.....*.6P~~~~~.~..}~...~~~.......~}~~.....~~~~~~....~}~...~~...~~}....~~..~~~~~~..~~.~.~~...~..~~}}~~....~~~~....~}....~...~..~~~~}~....}.~..~.~....~.}.~~~~~....~.....~.
69      8        0x0400100000004001  1334245222.887884  0.019706   0.066304      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0101    0         18441     0x31be1e0e  ..H\tiuyK1.....E6.,,/7H.........S=4/.07Bd........pH;645:BV.........XG?==?HU.........o[RNORYbu.................x`VOLLNVh.........XH?<<=DR.........[C:534:Da........xE80..2;M..
70      8        0x0400100000004001  1334245222.908335  0.020451   0.086755      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0101    0         18442     0x31be1e0e  ..H\niuy.1..........L9/,,.4Au........]=1-+,0;R.........F6.,,/7G.........T=4/.07Ac........sH<6459AU.........XH?==@HU.........o[ROORYbt.................y`VNLLNVh.........XH?<;
71      8        0x0400000000004000  1334245222.915332  0.029897   0.149739      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26535     0x2a173650  ..g....`*.6P.~.~.~..~~}~....~~~....~~}~......~~~.~~...~~~~.~....~~~~~~~...~~}~~......~~~~~~......~~~~}....~}~~~......~}~~........}~~~~.~~.~..~.........~~~.......~........~.
72      8        0x0400000000004000  1334245222.916573  0.001241   0.150980      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26536     0x2a173650  ..g.....*.6P~~~}.~..~~~~~...~.....~~~}~....~~~~~}~....~}..~~....~~..~~}....~.~~.~~....}~~|......~~.~~}.....~}}~......}~~...~....~~~~.....~~~.~~....~..~~~....~~~~~........~~
73      8        0x0400100000004001  1334245222.927796  0.019461   0.106216      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0101    0         18443     0x31be1e0e  ..H.iuz.1...=DQ.........\D:5349C`........{E80..2:L.........L9/,,.4@q........^=2-+,0:Q.........F7/,,/7G.........U=4/.07Aa........vI<6459AU.........YH?==@HU}........p[SOORYbt
74      8        0x0400000000004000  1334245222.945426  0.028853   0.179833      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26537     0x2a173650  ..g.....*.6P~~~.....}}}~....~.~..~}.~~.~...~..~......~~~~~.~~..~.~~~......~.~..~.....~~~~....~~..~~.~~.....~~~~......~~}.~......~~~~~~....~~.~.~~...~~~~~~.~~}~...~~....~..~
75      8        0x0400100000004001  1334245222.947757  0.019961   0.126177      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0101    0         18444     0x31be1e0e  ..H.iu{+1..........~.........y`VNLKNUg.........XH?<;=CP.........]D:5249C_.........F80..1:L.........M9/,,.4@n........_=2-+,/:P.........G7/,,/7F.........V=4/.07A_........yI<6
76      8        0x0400100000004001  1334245222.967973  0.020216   0.146393      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0101    0         18445     0x31be1e0e  ..H\riu{.1...459AT.........YH?==@HU|........r\SOOSYct.......~.........y`UNKKMUf.........XH?<;=CP.........]D:5249C^.........F80..1:K.........M:/,,-4?l........`>2-+,/:O.......
77      8        0x0400000000004000  1334245222.975446  0.030020   0.209853      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26538     0x2a173650  ..g....@*.6P.~.~....~~~~~~~~.....~~~~}.....~..~~.~..~..~~~}....~~}..~.......~~.~......~~~~.~~..~~~.~~~~~....~.~~.~...~}}}..~~....~~~~.~...|..~........~~~~~~~...}}~..~~.....
78      8        0x0400000000004000  1334245222.976670  0.001224   0.211077      3        eth:ipv4:udp              6c:33:a9:61:4d:17  68:7f:74:1d:5f:eb  0x0800   192.168.0.10   07       Private network           49154    216.234.64.16  us       Ymax Communications Corp  54550    17       0x0181    0         26539     0x2a173650  ..g.....*.6P~~~~....~~.~~...~..~...~}.......~~.~.~.....~}~~.~...~}~}........~..~....~.~.}~~~~..~~}~~}}~....~~}~~...~~~~.~.......~~~}~}..~~..~.~~...~..~~~.}}~~.....~......~~
79      8        0x0400100000004001  1334245222.988158  0.020185   0.166578      3        eth:ipv4:udp              68:7f:74:1d:5f:eb  6c:33:a9:61:4d:17  0x0800   216.234.64.16  us       Ymax Communications Corp  54550    192.168.0.10   07       Private network           49154    17       0x0101    0         18446     0x31be1e0e  ..H.iu|k1.....G7/,,/7F.........W>4/.06A_........|I<6459AT.........ZI@==@HTz........s\TOOSZct.......}.........z`UNKKMTe.........YH?<;=CO.........^D:4249B].........F80..1:K..
...

In order to listen to the content you need to convert to e.g. .wav format. Note that the encoding format G711u indicates that the raw stream is mulaw compressed. Just use ffmpeg which does a fine job.

$ cd /tmp/TranVoIP
$ ls
nudel_2a173650_8_A_G711u.raw  nudel_31be1e0e_8_B_G711u.raw
$ ffmpeg -f mulaw -ar 8k -ac 1 -i nudel_2a173650_8_A_G711u.raw nudelA.wav
ffmpeg version n4.3.2 Copyright (c) 2000-2021 the FFmpeg developers
...
$ ffmpeg -f mulaw -ar 8k -ac 1 -i nudel_31be1e0e_8_B_G711u.raw nudelB.wav
...
$ $ ls
nudel_2a173650_8_A_G711u.raw  nudel_31be1e0e_8_B_G711u.raw  nudelA.wav  nudelB.wav
$

If you use a player such as vlc, then you hear in nudelA.wav you hear the caller and in nudelB.wav the callee.

In order to see some RTCP output, try this pcap sip_sjphone_conf.pcap and execute t2 on it including packet mode.

$ t2 -r ~/data/sip_sjphone_conf.pcap -w ~/results/ -s
================================================================================
Tranalyzer 0.8.10 (Anteater), Tarantula. PID: 14507
================================================================================
[INF] Creating flows for L2, IPv4, IPv6
Active plugins:
    01: basicFlow, 0.8.10
    02: voipDetector, 0.8.10
    03: txtSink, 0.8.10
[INF] IPv4 Ver: 5, Rev: 16122020, Range Mode: 0, subnet ranges loaded: 406077 (406.08 K)
[INF] IPv6 Ver: 5, Rev: 17122020, Range Mode: 0, subnet ranges loaded: 51069 (51.07 K)
Processing file: /home/wurst/data/sip_sjphone_conf.pcap
Link layer type: Ethernet [EN10MB/1]
Dump start: 1272330627.070062 sec (Tue 27 Apr 2010 01:10:27 GMT)
Dump stop : 1272330670.254882 sec (Tue 27 Apr 2010 01:11:10 GMT)
Total dump duration: 43.184820 sec
Finished processing. Elapsed time: 0.001864 sec
Finished unloading flow memory. Time: 0.002044 sec
Percentage completed: 100.00%
Number of processed packets: 90
Number of processed bytes: 39025 (39.02 K)
Number of raw bytes: 39025 (39.02 K)
Number of pad bytes: 20
Number of pcap bytes: 40489 (40.49 K)
Number of IPv4 packets: 90 [100.00%]
Number of A packets: 50 [55.56%]
Number of B packets: 40 [44.44%]
Number of A bytes: 17146 (17.15 K) [43.94%]
Number of B bytes: 21879 (21.88 K) [56.06%]
Average A packet load: 342.92
Average B packet load: 546.98
--------------------------------------------------------------------------------
voipDetector: Aggregated voipStat=0x1187
voipDetector: max fd count: : 4
voipDetector: Number of SIP/RTP/RTCP packets: 90 [100.00%]
--------------------------------------------------------------------------------
Headers count: min: 3, max: 3, average: 3.00
Number of UDP packets: 90 [100.00%]
Number of UDP bytes: 39025 (39.02 K) [100.00%]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Number of processed   flows: 13
Number of processed A flows: 9 [69.23%]
Number of processed B flows: 4 [30.77%]
Number of request     flows: 9 [69.23%]
Number of reply       flows: 4 [30.77%]
Total   A/B    flow asymmetry: 0.38
Total req/rply flow asymmetry: 0.38
Number of processed   packets/flows: 6.92
Number of processed A packets/flows: 5.56
Number of processed B packets/flows: 10.00
Number of processed total packets/s: 2.08
Number of processed A+B   packets/s: 2.08
Number of processed A     packets/s: 1.16
Number of processed   B   packets/s: 0.93
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Number of average processed flows/s: 0.30
Average full raw bandwidth: 7229 b/s (7.23 Kb/s)
Average full bandwidth : 7226 b/s (7.22 Kb/s)
Max number of flows in memory: 13 [0.00%]
Memory usage: 0.01 GB [0.02%]
Aggregated flowStat=0x0400100010004000
[WRN] Consecutive duplicate IP ID
[INF] IPv4 flows
[INF] SIP/RTP

And the end report tells us, there is indeed RTCP and 4 voice comms with some packet loss. The extracted content is written to the /tmp/TranVoip directory, but as configured the directory is erased before writing.

$ tawk -V voipStat=0x1187
The voipStat column with value 0x1187 is to be interpreted as follows:

   bit | voipStat   | Description
   =============================================================================
     0 | 0x0001     | RTP detected
     1 | 0x0002     | RTCP detected
     2 | 0x0004     | SIP detected
     7 | 0x0080     | RTP marker
     8 | 0x0100     | RTP content write operation
    12 | 0x1000     | RTP Packet Loss detected

In the flow file you will see that there are many RTCP types being detected, and jitter info was conveyed.

$ tcol sip_sjphone_conf_flows.txt
%dir  flowInd  flowStat            timeFirst          timeLast           duration   numHdrDesc  numHdrs  hdrDesc       srcMac             dstMac             ethType  ethVlanID  srcIP        srcIPCC  srcIPOrg           srcPort  dstIP        dstIPCC  dstIPOrg           dstPort  l4Proto  voipStat  voipTyp  voipID      voipSRCnt  voipPMCnt  voipPMr  voipSIPStatCnt  voipSIPReqCnt  voipUsrAgnt  voipSIPCID           voipSIPStat              voipSIPReq               voipTPCnt  voipTBCnt  voipFracLst  voipCPMCnt  voipMaxIAT  voipFname
A     4        0x0400100000004000  1272330640.436538  1272330640.472347  0.035809   1           3        eth:ipv4:udp  00:19:b9:f7:4b:02  00:16:cb:8c:ea:27  0x0800              10.10.3.109  04       "Private network"  13300    10.10.1.159  04       "Private network"  49152    17       0x0101    0        0x3efeb4de  0          0          0        0               0              ""           ""                                                                     0          0          0            0           0           "/tmp/TranVoIP/nudel_3efeb4de_4_A_G711u.raw"
B     4        0x0400000000004001  1272330640.468537  1272330640.547489  0.078952   1           3        eth:ipv4:udp  00:16:cb:8c:ea:27  00:19:b9:f7:4b:02  0x0800              10.10.1.159  04       "Private network"  49152    10.10.3.109  04       "Private network"  13300    17       0x0181    3        0x81bc2252  0          0          0        0               0              ""           ""                                                                     0          0          0            0           0           "/tmp/TranVoIP/nudel_81bc2252_4_B_GSM.raw"
A     5        0x0400100000004000  1272330645.436875  1272330665.436731  19.999856  1           3        eth:ipv4:udp  00:19:b9:f7:4b:02  00:16:cb:8c:ea:27  0x0800              10.10.3.109  04       "Private network"  13301    10.10.1.159  04       "Private network"  49153    17       0x0002    200;202  0x3efeb4de  1          0          0        0               0              ""           ""                                                                     3          480        0            0           37          ""
A     6        0x0400100000004000  1272330645.455867  1272330665.455723  19.999856  1           3        eth:ipv4:udp  00:19:b9:f7:4b:02  00:16:cb:ab:a2:2b  0x0800              10.10.3.109  04       "Private network"  18933    10.10.1.203  04       "Private network"  49153    17       0x0002    201;202  0x41f3bca2  1          0          0        0               0              ""           ""                                                                     0          0          0            0           16          ""
A     9        0x0400000000004000  1272330666.186196  1272330666.207883  0.021687   1           3        eth:ipv4:udp  00:16:cb:8c:ea:27  00:19:b9:f7:4b:02  0x0800              10.10.1.159  04       "Private network"  49154    10.10.3.109  04       "Private network"  11128    17       0x0181    3        0x7ddbd928  0          0          0        0               0              ""           ""                                                                     0          0          0            0           0           "/tmp/TranVoIP/nudel_7ddbd928_9_A_GSM.raw"
A     7        0x0400000000004000  1272330659.729745  1272330669.382626  9.652881   1           3        eth:ipv4:udp  00:16:cb:ab:a2:2b  00:19:b9:f7:4b:02  0x0800              10.10.1.203  04       "Private network"  50030    10.10.3.109  04       "Private network"  5060     17       0x0004             0x00000000  0          0          0        6               1              ""           "alice@10.10.3.109"  100;180;200;200;200;200  REG                      0          0          0            0           0           ""
B     7        0x0400000000004001  1272330659.729874  1272330669.373073  9.643199   1           3        eth:ipv4:udp  00:19:b9:f7:4b:02  00:16:cb:ab:a2:2b  0x0800              10.10.3.109  04       "Private network"  5060     10.10.1.203  04       "Private network"  50030    17       0x0004             0x00000000  0          0          0        2               6              ""           "alice@10.10.3.109"  100;200                  INV;ACK;INV;ACK;INV;ACK  0          0          0            0           0           ""
A     8        0x0400000000004000  1272330666.144994  1272330669.382632  3.237638   1           3        eth:ipv4:udp  00:16:cb:ab:a2:2b  00:19:b9:f7:4b:02  0x0800              10.10.1.203  04       "Private network"  4001     10.10.3.109  04       "Private network"  30553    17       0x0002    202;203  0x33425619  1          0          0        0               0              ""           ""                                                                     0          0          0            0           0           ""
A     1        0x0400000000004000  1272330627.070062  1272330670.178186  43.108124  1           3        eth:ipv4:udp  00:16:cb:8c:ea:27  00:19:b9:f7:4b:02  0x0800              10.10.1.159  04       "Private network"  5060     10.10.3.109  04       "Private network"  5060     17       0x0004             0x00000000  0          0          0        2               6              ""           "Aaron@10.10.3.109"  200;200                  REG;INV;ACK;OPT;INV;ACK  0          0          0            0           0           ""
B     1        0x0400000000004001  1272330627.070257  1272330670.178331  43.108074  1           3        eth:ipv4:udp  00:19:b9:f7:4b:02  00:16:cb:8c:ea:27  0x0800              10.10.3.109  04       "Private network"  5060     10.10.1.159  04       "Private network"  5060     17       0x0004             0x00000000  0          0          0        6               4              ""           "Aaron@10.10.3.109"  100;200;100;180;183;200  INV;ACK;INV;ACK          0          0          0            0           0           ""
A     2        0x0400000000004000  1272330633.955796  1272330670.254882  36.299086  1           3        eth:ipv4:udp  00:16:cb:ab:a2:2b  00:19:b9:f7:4b:02  0x0800              10.10.1.203  04       "Private network"  5060     10.10.3.109  04       "Private network"  5060     17       0x0004             0x00000000  0          0          0        6               2              ""           "aptos@10.10.3.109"  100;180;200;200;200;200  REG;OPT                  0          0          0            0           0           ""
B     2        0x0400000000004001  1272330633.964017  1272330670.221160  36.257143  1           3        eth:ipv4:udp  00:19:b9:f7:4b:02  00:16:cb:ab:a2:2b  0x0800              10.10.3.109  04       "Private network"  5060     10.10.1.203  04       "Private network"  5060     17       0x0004             0x00000000  0          0          0        3               6              ""           "aptos@10.10.3.109"  100;200;200              INV;ACK;INV;ACK;INV;ACK  0          0          0            0           0           ""
A     3        0x0400000000004000  1272330640.436361  1272330670.251905  29.815544  1           3        eth:ipv4:udp  00:16:cb:ab:a2:2b  00:19:b9:f7:4b:02  0x0800              10.10.1.203  04       "Private network"  49152    10.10.3.109  04       "Private network"  18932    17       0x1181    0        0x2886dfa0  0          1          0        0               0              ""           ""                                                                     0          0          0            0           0           "/tmp/TranVoIP/nudel_2886dfa0_3_A_G711u.raw"

Similar info is available on a packet basis.

$ tcol sip_sjphone_conf_packets.txt
%pktNo  flowInd  flowStat            time               pktIAT     flowDuration  numHdrs  hdrDesc       ethVlanID  srcMac             dstMac             ethType  srcIP        srcIPCC  srcIPOrg         srcPort  dstIP        dstIPCC  dstIPOrg         dstPort  l4Proto  voipStat  voipType  voipSeqN  voipID      l7Content
...
26      4        0x0400000000004001  1272330640.511952  0.023427   0.043415      3        eth:ipv4:udp             00:16:cb:8c:ea:27  00:19:b9:f7:4b:02  0x0800   10.10.1.159  04       Private network  49152    10.10.3.109  04       Private network  13300    17       0x0181    3         32179     0x81bc2252  ..}....@.."R..d.....=m.....;.......sH......g"
27      1        0x0400000000004000  1272330640.526424  2.534303   13.456362     3        eth:ipv4:udp             00:16:cb:8c:ea:27  00:19:b9:f7:4b:02  0x0800   10.10.1.159  04       Private network  5060     10.10.3.109  04       Private network  5060     17       0x0004                                    ACK sip:aptos@10.10.3.109 SIP/2.0\r\nVia: SIP/2.0/UDP 10.10.1.159;rport;branch=z9hG4bK0a0a019f000000184bd639902fc4a3ef00000009\r\nContent-Length: 0\r\nCall-ID: B0A0D6FC-1DD1-11B2-8F35-E1DE365F50B8@10.10.1.159\r\nCSeq: 1 ACK\r\nFrom: "unknown"<sip:Aaron@10.10.3.109>;tag=1020318343398661549\r\nMax-Forwards: 70\r\nTo: <sip:aptos@10.10.3.109>;tag=as609c9373\r\nUser-Agent: SJphone/1.60.299a/L (SJ Labs)\r\n\r\n
28      4        0x0400000000004001  1272330640.526430  0.014478   0.057893      3        eth:ipv4:udp             00:16:cb:8c:ea:27  00:19:b9:f7:4b:02  0x0800   10.10.1.159  04       Private network  49152    10.10.3.109  04       Private network  13300    17       0x0181    3         32180     0x81bc2252  ..}......."R.id... ...J......2............q9%
29      1        0x0400000000004001  1272330640.526519  0.086535   13.456262     3        eth:ipv4:udp             00:19:b9:f7:4b:02  00:16:cb:8c:ea:27  0x0800   10.10.3.109  04       Private network  5060     10.10.1.159  04       Private network  5060     17       0x0004                                    INVITE sip:Aaron@10.10.1.159:5060 SIP/2.0\r\nVia: SIP/2.0/UDP 10.10.3.109:5060;branch=z9hG4bK54699aaa;rport\r\nFrom: <sip:aptos@10.10.3.109>;tag=as609c9373\r\nTo: "unknown"<sip:Aaron@10.10.3.109>;tag=1020318343398661549\r\nContact: <sip:aptos@10.10.3.109>\r\nCall-ID: B0A0D6FC-1DD1-11B2-8F35-E1DE365F50B8@10.10.1.159\r\nCSeq: 102 INVITE\r\nUser-Agent: Asterisk PBX\r\nMax-Forwards: 70\r\nAllow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY\r\nSupported: replaces\r\nContent-Type: application/sdp\r\nContent-Length: 236\r\n\r\nv=0\r\no=root 8369 8371 IN IP4 10.10.1.203\r\ns=session\r\nc=IN IP4 10.10.1.203\r\nt=0 0\r\nm=audio 49152 RTP/AVP 0 101\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:101 telephone-event/8000\r\na=fmtp:101 0-16\r\na=silenceSupp:off - - - -\r\na=ptime:20\r\na=sendrecv\r\n
30      2        0x0400000000004000  1272330640.529086  0.089419   6.573290      3        eth:ipv4:udp             00:16:cb:ab:a2:2b  00:19:b9:f7:4b:02  0x0800   10.10.1.203  04       Private network  5060     10.10.3.109  04       Private network  5060     17       0x0004                                    SIP/2.0 200 OK\r\nVia: SIP/2.0/UDP 10.10.3.109:5060;rport=5060;received=10.10.3.109;branch=z9hG4bK24bf4caf\r\nContent-Length: 217\r\nContact: <sip:aptos@10.10.1.203:5060>\r\nCall-ID: 4da654ff563e88e64845418c304a5a5b@10.10.3.109\r\nContent-Type: application/sdp\r\nCSeq: 103 INVITE\r\nFrom: "Aaron"<sip:Aaron@10.10.3.109>;tag=as657066cb\r\nServer: SJphone/1.60.299a/L (SJ Labs)\r\nTo: "unknown"<sip:aptos@10.10.1.203:5060>;tag=10203183971857523383\r\n\r\nv=0\r\no=- 3481319438 3481319438 IN IP4 10.10.1.203\r\ns=SJphone\r\nc=IN IP4 10.10.1.203\r\nt=0 0\r\na=direction:active\r\nm=audio 49152 RTP/AVP 0 101\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:101 telephone-event/8000\r\na=fmtp:101 0-11,16\r\n
31      2        0x0400000000004001  1272330640.529186  0.089136   6.565169      3        eth:ipv4:udp             00:19:b9:f7:4b:02  00:16:cb:ab:a2:2b  0x0800   10.10.3.109  04       Private network  5060     10.10.1.203  04       Private network  5060     17       0x0004                                    ACK sip:aptos@10.10.1.203:5060 SIP/2.0\r\nVia: SIP/2.0/UDP 10.10.3.109:5060;branch=z9hG4bK0509c90c;rport\r\nFrom: "Aaron" <sip:Aaron@10.10.3.109>;tag=as657066cb\r\nTo: <sip:aptos@10.10.1.203:5060>;tag=10203183971857523383\r\nContact: <sip:Aaron@10.10.3.109>\r\nCall-ID: 4da654ff563e88e64845418c304a5a5b@10.10.3.109\r\nCSeq: 103 ACK\r\nUser-Agent: Asterisk PBX\r\nMax-Forwards: 70\r\nContent-Length: 0\r\n\r\n
32      4        0x0400000000004001  1272330640.547489  0.021059   0.078952      3        eth:ipv4:udp             00:16:cb:8c:ea:27  00:19:b9:f7:4b:02  0x0800   10.10.1.159  04       Private network  49152    10.10.3.109  04       Private network  13300    17       0x0181    3         32181     0x81bc2252  ..}......."R.(l....:..C.....u.a.@.].......m..
33      1        0x0400000000004000  1272330640.577891  0.051467   13.507829     3        eth:ipv4:udp             00:16:cb:8c:ea:27  00:19:b9:f7:4b:02  0x0800   10.10.1.159  04       Private network  5060     10.10.3.109  04       Private network  5060     17       0x0004                                    SIP/2.0 200 OK\r\nVia: SIP/2.0/UDP 10.10.3.109:5060;rport=5060;received=10.10.3.109;branch=z9hG4bK54699aaa\r\nContent-Length: 217\r\nContact: <sip:Aaron@10.10.1.159:5060>\r\nCall-ID: B0A0D6FC-1DD1-11B2-8F35-E1DE365F50B8@10.10.1.159\r\nContent-Type: application/sdp\r\nCSeq: 102 INVITE\r\nFrom: <sip:aptos@10.10.3.109>;tag=as609c9373\r\nServer: SJphone/1.60.299a/L (SJ Labs)\r\nTo: "unknown"<sip:Aaron@10.10.3.109>;tag=1020318343398661549\r\n\r\nv=0\r\no=- 3481319437 3481319438 IN IP4 10.10.1.159\r\ns=SJphone\r\nc=IN IP4 10.10.1.159\r\nt=0 0\r\na=direction:active\r\nm=audio 49152 RTP/AVP 0 101\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:101 telephone-event/8000\r\na=fmtp:101 0-11,16\r\n
34      1        0x0400000000004001  1272330640.577989  0.051470   13.507732     3        eth:ipv4:udp             00:19:b9:f7:4b:02  00:16:cb:8c:ea:27  0x0800   10.10.3.109  04       Private network  5060     10.10.1.159  04       Private network  5060     17       0x0004                                    ACK sip:Aaron@10.10.1.159:5060 SIP/2.0\r\nVia: SIP/2.0/UDP 10.10.3.109:5060;branch=z9hG4bK5d190680;rport\r\nFrom: <sip:aptos@10.10.3.109>;tag=as609c9373\r\nTo: "unknown"<sip:Aaron@10.10.3.109>;tag=1020318343398661549\r\nContact: <sip:aptos@10.10.3.109>\r\nCall-ID: B0A0D6FC-1DD1-11B2-8F35-E1DE365F50B8@10.10.1.159\r\nCSeq: 102 ACK\r\nUser-Agent: Asterisk PBX\r\nMax-Forwards: 70\r\nContent-Length: 0\r\n\r\n
35      5        0x0400000000004000  1272330645.436875  0.000000   0.000000      3        eth:ipv4:udp             00:19:b9:f7:4b:02  00:16:cb:8c:ea:27  0x0800   10.10.3.109  04       Private network  13301    10.10.1.159  04       Private network  49153    17       0x0002    200;202   32181     0x3efeb4de  ....>.......o.T,...@.........."R......}....%............>.......
36      6        0x0400000000004000  1272330645.455867  0.000000   0.000000      3        eth:ipv4:udp             00:19:b9:f7:4b:02  00:16:cb:ab:a2:2b  0x0800   10.10.3.109  04       Private network  18933    10.10.1.203  04       Private network  49153    17       0x0002    201;202   24249     0x41f3bca2  ....A...(.........^.................A.......
37      5        0x0400000000004000  1272330650.436866  4.999991   4.999991      3        eth:ipv4:udp             00:19:b9:f7:4b:02  00:16:cb:8c:ea:27  0x0800   10.10.3.109  04       Private network  13301    10.10.1.159  04       Private network  49153    17       0x0002    201;202   32181     0x3efeb4de  ....>....."R......}....%............>.......
38      6        0x0400000000004000  1272330650.455831  4.999964   4.999964      3        eth:ipv4:udp             00:19:b9:f7:4b:02  00:16:cb:ab:a2:2b  0x0800   10.10.3.109  04       Private network  18933    10.10.1.203  04       Private network  49153    17       0x0002    201;202   24249     0x41f3bca2  ....A...(.........^.................A.......
39      5        0x0400100000004000  1272330655.436803  4.999937   9.999928      3        eth:ipv4:udp             00:19:b9:f7:4b:02  00:16:cb:8c:ea:27  0x0800   10.10.3.109  04       Private network  13301    10.10.1.159  04       Private network  49153    17       0x0002    201;202   32181     0x3efeb4de  ....>....."R......}....%............>.......
40      6        0x0400100000004000  1272330655.455793  4.999962   9.999926      3        eth:ipv4:udp             00:19:b9:f7:4b:02  00:16:cb:ab:a2:2b  0x0800   10.10.3.109  04       Private network  18933    10.10.1.203  04       Private network  49153    17       0x0002    201;202   24249     0x41f3bca2  ....A...(.........^.................A.......
...

Try your own traffic or the ones on the site listed earlier.

Don’t forget to reset the voipDetector plugin configuration:

$ t2build --reset voipDetector && t2build voipDetector
...
$

Have fun!