A small snippet for passing only valid INVITEs from the Internet to your OpenSIPS server: allowing calls from VoIP ISPs and registered users only.
# antiflood
if(!is_myself("$si") && $Rp == 5060)
{
if(!is_registered("location", "$fu") && !check_source_address("1"))
{
exit;
}
}
In this example we store ISPs IP addresses in the ‘address’ table of the permissions module, in group 1, which is seen from the output of the corresponding fifo command:
[root@voip-srv ~]# opensipsctl fifo address_dump part:: default dest:: grp=1 ip=193.201.229.35 mask=32 port=0 proto=any pattern= context_info=VoIP ISP Multifon dest:: grp=1 ip=81.211.59.102 mask=32 port=0 proto=any pattern= context_info=VoIP ISP ekt.ip.Beeline dest:: grp=1 ip=212.119.246.230 mask=32 port=0 proto=any pattern= context_info=VoIP ISP ip.Beeline