I've been trying to prepare files for other codecs to use with pcap_play and am
having difficulties.
I save a file (for example, PCMU) using this command inside the sipp script:
<nop>
<action>
<exec command="/usr/sbin/tcpdump -T rtp -i any -s 0 -w
[logdir]/tcpdump.pcap dst port 49120" />
</action>
</nop>
A file is produced, but doesn't play back nicely. I note that when I examine
the provided g711a.pcap file with wireshark, it shows packets as UDP
1 0.000000 10.1.3.143 10.1.6.18
294 UDP Source port: commplex-main Destination port: raid-cd
If I ask wireshark to decode the reference g711a.pcap file as RTP, it looks
good:
1 0.000000 10.1.3.143 10.1.6.18
294 RTP PT=ITU-T G.711 PCMA, SSRC=0xDEE0EE8F, Seq=59133,
Time=240, Mark
The dump I make of mulaw it looks like this in wireshark. 214 bytes size
instead of 294. There is an entry every 20 millseconds, so it is the RTP.
2 0.225408 ff.fe.fe ff.7d.fe 214 FC
Unknown frame
If I ask wireshark to decode as UDP, it remains the same (as in it can't decode
as UDP usefully).
Any thoughts on what I'm doing wrong? tcpdump options wrong perhaps?
Thanks!
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