PROBLEM with .vcom-tunnel ? NO SOUND AFTER x SEC

Hi, is my first post here…
i have a problem with it tunel, i dont know what is it… but when i stabilished a call al are good…

but after of 3 seconds on the log of the command : tcpdump -i eth0 -n -s0 udp

17:19:31.194280 IP > UDP, length 60

Appear it, and in the call the SOUND swich to NULL, off, mute…

I hope someone understand it and can help me… thanks…

Linux 2.6.18-238.12.1.el5 #1 SMP Tue May 31 13:23:01 EDT 2011 i686 athlon i386 GNU/Linux
Elastix 2.3.0 Stable
Im using RTMP RED5… The call is middle FLASH…to Softphone

Please provide the protocol trace from Asterisk (sip, iax, h.323, etc.).

How i send you that, the command for console please. Thanks

sip set debug on
core set debug 5 chan_sip

Paste it into the forum, after minimally obscuring sensitive information.