VOIP .raw problem: Can't save forward direction in a file: Wrong length of captured packets!

[nangergong <nangergong () gmail com>]

hi, all

  I used tcpdump to capture VOIP traffic on linux platform. The captured
data are in .pcap format

  And then I opened the .pcap using wireshark.

 I've configured the preference->protocol->SSL->RSA keylist, so if I used
wireshark for capturing VOIP traffic, the wireshark GUI will show the RTP
format and RTCP packets. But if I open the .pcap files which are captured by
tcpdump, I need to mannually decode those UDP packets as RTP packets.

  After decoding UDP->RTP and RTCP, I used VOIP->RTP->RTP Stream Analysis to
extract .raw from these packets. However, when I want to save these .raw
files, Wireshark prompts:

       *Can't save forward direction in a file: Wrong length of captured
packets!

 Does anyone know how to tackle this problem? Thank you!
*

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