I've got a stable, working FreePBX server. I've used it behind several different firewalls, with no issues (once I got everything tweaked.) It has an optional setting to handle NAT traversal (e.g. rewrites IP addresses in RTP headers and such.) That all works fine. So I've migrated to UTM 9, and am looking at the VOIP helper, and am wondering if it makes sense to use it or not. From what I've read, I can disable automatic firewall rules in the SIP&RTP DNAT rules, since the VOIP helper does that. It also claims (IIRC) to rewrite SIP headers and such. I'm already doing that in FreePBX, but had forgotten that until I had been running the VOIP helper for a couple of days, with no issues. I assume it detects that nothing needs to be rewritten? Even so, it would seem to be a good idea to disable that in FreePBX, no? What is the concensus as to whether it makes sense to use the VOIP helper? I'm using a provider (Callcentric) who proxies their own audio, and uses 2 specific /24 subnets, so I can lock things down solidly, so I would think Strict mode wouldn't be helpful (or harmful for that matter?) Any thoughts are welcome :)
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