On Fri, Feb 9, 2018 at 6:27 AM, Olivier <oza.4...@gmail.com> wrote:
> SIPp's PCAP play feature can replay pre-recorded audio stream towards
> destination (see ).
> Doc mentions tcpdump and Wireshark as tools to record such RTP streams
> without further details.
> Looking at SIPp 3.2 source archive, I found PCAP samples in a pcap/
> Sample pcap/g711a.pcap file includes RTP from 10.1.3.1:5000 to
> 1. How can you "forge" IPs and/or ports of a pcap file ?
You don't have to. sipp only takes the rtp payload from the packets in the
pcap then just sends the datagrams to the remote in the scenario.
> 2. When generating simultaneous calls from one source device to a single
> target device, do you need to have specific PCAP files (one specific for
> each call) with specific source port ?
Nope. See above.
> 3. How do you capture an RTP flux with thark or tcpdump ?
This is a little tricky. tcpdump isn't much help if you don't know the
ports. With tshark though you can create a "read" filter that can capture
only RTP packets but it's very expensive. Usually, I just capture all UDP
packets between the hosts in question with tcpdump, then use the Wireshark
gui to filter the rtp stream. Then you can just export those packets.
> Best regards
>  http://sipp.sourceforge.net/doc/reference.html#PCAP+Play
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