[Users] symmetric firewall without nat

[Alexander Bergolth]

Hi!

In our organization there are many subnets with public-ip-adresses that
are behind stateful-firewalls that prevent incoming connections from
outside. If the clients are in two different protected subnets, they
won't be able to communicate without an rtpproxy.

Unfortunately since there is no NAT involved, the nat_uac_test() won't
be useful. Is there any other way for the server to detect that an
rtpproxy has to be used? Is there a way for the clients to detect it and
report it to the server?

Thanks in advance,
--leo
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Alexander.Bergolth (at) wu-wien.ac.at           Fax: +43-1-31336-906050
Zentrum fuer Informatikdienste - Wirtschaftsuniversitaet Wien - Austria