My SIP supplier wants to send calls to my system using SIP URI.
They have given me a list of SIP Signalling servers, which i have whitelisted on the firewall on port 5060, however, they have stated that there are so many “media IPs” that calls could come from, that i need to open up 10,000-20,000 to the internet.
In order to have calls accepted by the system, i have had to enable allow anonymous calls.
So really my question is - is it safe to have 5060 open to a specific set of IPs, whilst having
10,000-20,000 open to the world, with allow anonymous calls enabled?
Appreciate any thoughts