Thank you everyone for your help! :-) I think I have it now. Tonight I was able to get my test phone to go over to VLAN 300 and the attached PC stayed on VLAN 1. Here are the things that seem to...

@KJK Thank you for the information. I think I knew some of this already, just in different terminology. If it helps, here are two screenshots from the voice gateway: Here is a screenshot of the...

@KJK Thank you. KJK wrote @ScrotTailNern Is that Voice Gateway VLAN-aware or not? If not, try changing Port 48 in VLAN 300 to Untagged and set PVID to 300. You can remove this port from VLAN 1, too....

Somnus wrote @ScrotTailNern Is there any details about your VLAN settings? I think the Phone and the Voice gateway should be able to detect the tagged data. You may contact your phone support and ask...

Greetings! Please consider these conditions before continuing to read: I don't do network architecture enough to grasp all the terminology The equipment is 900 miles away from me and the customer...