My PBX is behind NAT on a private network, and the default for outbound firewall rules is deny all, with desired outbound traffic allowed.
What ports do I need to allow the pbx to access outbound for it to function correctly (apart from sip and rtp, 80 and 443)?
With settings at that draconian a level, I’m not sure you can.
If you allow outbound traffic to establish a reasonably persistent session and an inbound path (which just about every application requires), you shouldn’t actually need to open any ports for outbound traffic. For inbound traffic (establishing calls with an ITSP, for example) you need to allow UDP 5060/5160 and 10000-20000.
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