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Why use the firewall if we already have a main system firewall?

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?

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