We are using a Yeastar S20 PBX. I have to set up a whole bunch of firewall rules to allow traffic from my SIP provider. Before I do so, I was wondering if I need to even enable the firewall on my Yeastar system, since I already have a firewall protecting my office network as a whole. Is there value in having the dual firewalls in place?
Why use the firewall if we already have a main system firewall?