Provide method to block calls from a given IP
Issue generated from Tuleap's migration script. Originally submitted by: Ciro Santilli (cirosantilli)
During the FOSDEM, I got tens of voice calls from a given IPs with no response.
@adrienberaud said that this is because the venue had a well configured UPnP, which allowed SIP port scanners to find us (or something like that, I don't know networking yet :-))
We should provide some mechanism to prevent such annoyances, e.g. explicitly blocking the IP.
Some other people told be about tools like fail2ban, Sec, or using random ports, but I don't know if any of that applies to us.