Hi.
Nowadays I'm having problems to take right control of SIP messages, in a
situation with user agents present in the LAN and WAN (some of them are behind
NAT, to the point of view of OpenSIPS).
To control everything, I'm using local domain and public domain registered in
the Domain table. In addiction I intend to implement the following algorithm:
If message == SIP INVITE
{
//Tries to guess if client's request originated behind a nat. The parameter
determines what heuristics is used
// 2 - the "received" test is used: address in Via is compared against
source IP address of signaling .
// 32 - address in Contact is compared against source IP address of
signaling.
If ( ! nat_uac_test(2 + 32))
{
//caller is in local network
If callee is behind a NAT from the point of view of opensips
{
avp_db_query("select domain from domain where attrs = public",
"$avp(DOMAIN)");
set_advertised_address ("$avp(DOMAIN));
}
else
{
avp_db_query("select domain from domain where attrs = local",
"$avp(DOMAIN)");
set_advertised_address ("$avp(DOMAIN));
}
}
else
{
avp_db_query("select domain from domain where attrs = public",
"$avp(DOMAIN)");
set_advertised_address ("$avp(DOMAIN));
}
}
However, how can I know whether the callee is not in the same network area as
the caller, so the callee is behind a NAT?
Any hint will be very helpful!
RODRIGO PIMENTA CARVALHO
Inatel Competence Center
Software
Ph: +55 35 3471 9200 RAMAL 979
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