[Users] Problem with openser registration

[voipwala hindustani]

Hello openser experts,
           I was trying to set up a openser box in public IP and observed a
wiered behaviour.
           If I ran openser in port 5060 and try to register from a sip
client, I get response from the openser, but when I try to run it in
different port, something like 40000. and then try to connect from a sip
client, I could see that the packets could reach the openser box using
ethereal. But openser does not respond to these requests. I tried to put log
in route() but didnt get any, this looks like openser didnot pick up the
request for itself.
           I am using openser 1.0.1 and I am not running any firewall in the
public openser.
           Is this problem known ? Am I missing something ?
           Also what is the significance of "listen" parameter in openser
configuration file.

Regards,
Voipwala
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