Anaya Nolan
SIPP is a tool that supports bidirectional RTP and SRTP checking. It comes with a pre-recorded G711 alaw pcap file and out-of-band DTMFs in the pcap/ directory. The PCAP play feature allows users to replay pre-recorded RTP streams and emulate the behaviour of any SIP equipment. While SIPP has the capability to play G711A law pcap files, there have been instances where users have encountered issues with SIPP not being able to open certain pcap files. In such cases, the file format may need to be converted to a standard libpcap file using tools like editcap or Wireshark.
| Characteristics | Values |
|---|---|
| SIPp support | Bidirectional RTP or bidirectional SRTP checking |
| PCAP play feature | Uses the PCAP library to replay pre-recorded RTP streams towards a destination |
| RTP stream recording tools | Wireshark, tcpdump |
| RTP stream types | Voice, video, voice+video, out of band DTMFs/RFC 2833, T38 fax |
| Emulation | Can emulate the behavior of any SIP equipment by replaying the RTP stream as it was recorded |
| Reproduction | Can reproduce exactly what has been captured using an IP sniffer like Wireshark |
| Example | UAC with media (uac_pcap) embedded scenario |
| G711 alaw file | Comes pre-recorded with SIPp in the pcap/ directory |
| Out of band DTMFs | RFC 2833 in the pcap/ directory |
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What You'll Learn
SIPp's PCAP play feature
To use the PCAP play feature, users can specify the path to the pcap file they want to play in the SIPP xml script. For example, the code "exec play_pcap_audio="/home/MM08-T/Desktop/owntest.pcap>" would play the pcap file "owntest.pcap" located on the user's desktop.
It is worth noting that the SIPP xml script does not handle "101 Dialog Establishment" responses from Linphone. To address this, users can try adding 101 response handling to their XML file and trying again. Additionally, depending on the system settings, users might need to be root to use the PCAP play feature.
The PCAP play feature can be used with tools like tcpdump and Wireshark to record and replay RTP streams. SIPP only takes the RTP payload from the packets in the pcap and sends the datagrams to the remote in the scenario. This allows for flexibility in replaying pre-recorded audio streams.
Overall, the SIPP PCAP play feature provides a powerful tool for replaying pre-recorded audio streams and testing SIP proxies/B2BUAs. By following the instructions provided and specifying the correct file paths, users can take advantage of this feature to replay pcap files and analyse SIP messages effectively.
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SIPp's support for bidirectional RTP and SRTP checking
SIPPs (Session Initiation Protocol) supports bidirectional RTP and SRTP checking. This allows for the testing of RTP and SRTP bit patterns, which is essential for ensuring the proper functioning of SIP-based systems.
The support for bidirectional RTP and SRTP checking in SIPPs is provided through the use of the Gateway RTP/SRTP bit pattern testing feature. This feature enables the testing of RTP and SRTP streams to ensure that they are functioning correctly and securely. The testing process involves analysing the bit patterns within the RTP and SRTP packets to verify that they conform to the specified standards and protocols.
One of the key advantages of using SIPPs for bidirectional RTP and SRTP checking is its ability to handle complex scenarios. The software provides a range of scenario files that serve as examples, allowing users to test their systems thoroughly. These scenario files cover various XML syntax changes and provide clear instructions on how to use media ports and RTP stream audio ports effectively.
Additionally, SIPPs offers detailed feature documentation upon request. This documentation provides further insights into the Gateway RTP/SRTP bit pattern testing feature and its requirements, such as the need for the --with-rtpstream and --with-openssl options. By utilising this documentation, users can gain a deeper understanding of the testing process and ensure that they are employing the software correctly.
Furthermore, SIPPs facilitates the retrieval of RTP error status codes in the same manner as other error codes. This convenience enables users to easily access the RTP/SRTP logs, which are stored in the SIPP execution directory. By providing straightforward access to this critical information, SIPPs enhances the overall efficiency of the testing process.
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SIPp's G711 alaw pre-recorded pcap file
SIPPs G711 alaw pre-recorded pcap file is an example of a UAC with media (uac_pcap) embedded scenario. SIPP comes with a pre-recorded pcap file and out-of-band (RFC 2833) DTMFs in the pcap/ directory. The PCAP play feature uses pthread_setschedparam calls from the pthread library. Depending on the system settings, you may need to be a root user to allow this.
The PCAP play feature is a powerful tool that allows for the playback and analysis of PCAP files, which are data packets captured on a network. These files can contain a wealth of information, including network traffic, packet loss, and latency. By using the PCAP play feature, users can gain valuable insights into the performance and health of their network.
One of the key benefits of the PCAP play feature is its ability to play out-of-band DTMFs. DTMFs, or dual-tone multi-frequency signals, are the tones generated when a phone number is dialed. These signals are typically out of the band of a standard telephone call, which means they are not transmitted over the same channel as the voice data. Instead, they are transmitted through a separate channel, such as a signalling channel.
By including out-of-band DTMFs in the pcap file, the SIPP tool allows for a more comprehensive analysis of the network traffic. This can be particularly useful for troubleshooting and debugging purposes, as it provides a more complete picture of the network activity.
To use the PCAP play feature, users may need to have root access to their system. This is due to the pthread_setschedparam calls, which require elevated permissions to execute. However, by having root access, users can gain deeper insights into their network traffic and take advantage of the full capabilities of the PCAP play feature.
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Using SIPp to play RTP streams
The RTP streaming functionality introduces five new SIPp options and a new scenario action. The new action, "rtp_stream", controls the playback of RTP traffic from within a scenario and has the following parameters: pause, resume, and play. The "pause" parameter pauses the playback of the current RTP stream. When paused, no RTP packets are transmitted, and requests to pause an already-paused stream are discarded. The "resume" parameter resumes the playback of a paused RTP stream, picking up from the last position. The "play" parameter is used to play a new RTP stream, and a loopcount can be specified to indicate how many times the audio file should be played before automatically stopping. If no loopcount is provided, the default is 1. The payloadtype parameter tells SIPp what codec was used to encode the audio file. Currently, payload types 0, 8, and 18 are supported.
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SIPp's compatibility with standard libpcap files
SIPPs can play out G711A law PCAP files, but it is important to note that it has specific requirements for the format of the PCAP files it can process. SIPP is compatible with standard libpcap files.
When using SIPPs, it is important to ensure that the PCAP files adhere to the expected format. In one instance, a user reported an issue with SIPP not being able to open a PCAP file they had generated. The issue was identified to be related to the file format. The user was advised to use the editcap utility or Wireshark to convert the file into a standard libpcap format. By running the command 'editcap g711u2ss.pcap g711u2ss-sipp.pcap', the user was able to create a file that SIPP could successfully read.
Another important consideration is the audio format within the PCAP file. SIPP expects audio files to be in a specific format, such as WAV files encoded with PCAM ('A-law'). This ensures compatibility with SIPP's capabilities. It is worth noting that SIPP also offers features like looping audio, which can be achieved by adding ',-1' after the file name within double quotes.
To check the version and capabilities of SIPP, you can use the command './sipp -v'. This will provide information about the specific version and its compatibility with PCAP files. For example, the version mentioned in the provided link, SIPp v3.6-dev-149-gb95f98f-PCAP-RTPSTREAM, indicates support for PCAP and RTP stream features.
In summary, while SIPPs can play out G711A law PCAP files, it is important to ensure that the PCAP files adhere to the expected standard libpcap format and that the audio within the files is in a compatible format, such as WAV with PCAM encoding. By following these guidelines, users can effectively utilize SIPPs for playing out G711A law PCAP files.
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Frequently asked questions
SIPP is a tool that has support for bidirectional RTP or bidirectional SRTP checking.
The PCAP play feature makes use of the PCAP library to replay pre-recorded RTP streams towards a destination.
SIPP comes with a G711 alaw pre-recorded pcap file and out-of-band (RFC 2833) DTMFs in the pcap/ directory.
Yes, SIPP comes with a G711 alaw pre-recorded pcap file.
Use the editcap utility to convert a Visual Networks file to a standard libpcap file.
