Doc Summary
Overview #
Polycom IP desktop phones feature an integrated secondary Ethernet port (PC pass-through port) that allows a computer to share a single network drop with the phone. In certain environments, administrators need to disable this port to enforce network security policies such as preventing unauthorized personal devices, rogue routers, or unauthorized DHCP servers from being plugged into the network behind the phone.
The provisioning parameter polycom_pc_port_mode controls the administrative state of this secondary pass-through port.
Parameter Reference #
| Parameter Name | Allowed Values | Default | Description |
|---|---|---|---|
polycom_pc_port_mode |
-1, 0 |
0 |
Controls PC pass-through Ethernet port operation. |
Value Definitions #
-1(Disabled): Shuts down the secondary PC port completely. Any network device plugged into the back of the phone will lose connectivity.0(Auto / Enabled): Default operational mode. Enables pass-through network bridging to attached devices.
Important Note: Changes to this parameter require the Polycom phone to reboot and re-provision before the port state change takes effect.
Device-Level Configuration Guide #
To apply this restriction to a specific device / extension without altering global device defaults across the entire tenant:
- Log in to the administrative portal.
- Navigate to Accounts > Devices.
- Locate and select the target device / extension requiring the configuration.
- Scroll down to the Settings (Custom Device Parameters) section.
- Create a new custom setting entry:
- Name:
polycom_pc_port_mode - Value:
-1(to disable) or0(to enable/restore)
- Name:
- Click Save Changes.
- Reboot / Re-provision the target device to apply the configuration.
Verification & Testing #
- Once re-provisioned, observe the phone status LED during restart.
- Plug an Ethernet cable into the phone’s PC port and attach a test laptop/device.
- Verify that the test device fails to obtain an IP address or link light when set to
-1.
