problem with relay server using pcap

["Brocha Strous" <Brocha.Strous () Kayote com>]

Hello,
I have a relay server which receives UDP packets (RTP actually - media
for a VOIP call) on one port and relays them to their intended
destination sending them from a different port. The implementation using
pcap seems to be problematic for a small number of users (possibly
behind a particular kind of NAT or passing thru some different kind of
routers) while the same server implemented without pcap (using regular
application layer sockets) works fine for these same users. I have not
been able to identify what is different about these users - any ideas of
where to look would be appreciated.

Thanks,
Brocha
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