We found an issue with the grandstream.ph.xml template for GrandStream GXP21XX phones where the PC Port is disabled by default. This appears to be due to the template pulling the "Enable VLAN for PC Port" value and using it for the PC Port Mode setting on the phone. <!-- PC Port Mode. 0 - Enable, 1 - Disabled, 2 - Mirrored. Default is 0 --> <!-- Number: 0, 1, 2 --> <!-- Mandatory --> <P1348>%%vlanpcenabled%%</P1348> To workaround this issue we Enabled the PC Port VLAN, but left the VLNA ID set to "0" in the phone provisioning tab. This is our only site with Grandstream phones, so I cannot validate this on any other systems.