In this case, an untagged port just means that the switchport is stripping off the VLAN tag before sending out the frame and any return traffic has the tag added back on. VLANs can get confusing, but my terminology is probably off because I've been dealing with Aruba/HP switches vs. About the only thing I haven’t tried yet is setting up another physical port on the XG for the phone system instead of using a VLAN interface, but I don’t see any reason that should work vs. I think I must be missing something obvious here. I set up a mirrored port for the phone system and confirmed with wireshark that the phone system is trying to send RTP packets to the correct external IP. After setting up the DNAT and firewall rules that matched the other firewall for our NEC VoIP system, I can place a call and see the expected SIP traffic in wireshark, but I only get voice coming in from the outside, no voice is going out. The phone system connects to the same network switch on an untagged port. I don’t think this should make a difference to the problem I’m seeing, but I’m using a VLAN interface on our LAN port to reach the phone VLAN. Hello, let me start off by saying that our VoIP system is working fine with a different firewall, so I know everything is good there.
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