I have a fairly simple setup at a client. The production network exists on VLAN1 - .235 network. The client has chosen to go with a Cisco, on-prem, VoIP setup that came preconfigured with 2, Cisco layer 3 switches, including tagged VLAN2 traffic - .20. The primary VoIP traffic runs directly out a single interface on the ISP Modem working in passthrough mode. The voicemail module, however, needs a NATed gateway on the firewall to facilitate voicemail to email .wav files and some kind of GUI access. How can I set a singe switchport on the firewall to be an untagged interface 192.168.20.10 that will act as a gateway for the Voicemail unit, and pass traffic directly to the WAN interface? Is this accomplished with a virtual IP for the switchport? No matter what I've tried so far I have not been able to ping the interface from the...
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