XGS - DHCP String option 128 Vlan Polycom

Question

We were doing DHCP via Windows Server but decided to use Sophos XGS. 
 DHCP to assign VLAN to Polycom phones via OPTION 128 String VLAN-A=20; - NOTE the ; (semicolon) MUST be at the end of the string for it to work with Polycom. XGS will not allow me to include a semicolon in a string. - Why not ? Can Sophos DEV fix this? I will create a case. 
 I tried removing the semicolon and the phone will not switch to VLAN 20. Must be there. 
 SEE - https://community.poly.com/t5/VoIP-SIP-Phones/FAQ-Utilizing-VLAN-s-with-Polycom-phones/td-p/38100 
 Alternatively as a work around I setup LLDP on a port on an Extreme Summit, and phone would put self config for correct Vlan.

LuCar Toni · Accepted Answer

You could try an encoded entry? See: How to enter special-characters like '&' to DHCP-option string-values ? 
 https://gchq.github.io/CyberChef/ That helps you to get the correct value.

AstaroNBack · Answer

Toni, Sorry late getting back, but encoding in hex is a solution that worked. Please follow the below steps to create a custom DHCP option: SSH to the firewall: SSH to the firewall using PuTTY Go to 4) Device Console Run the command to add the custom DHCP option: system dhcp dhcp-options add optioncode 128 optionname optiontype string After the option is added, add a value to the option. As we need to have ';' at the end of the string, convert " VLAN-A=20;" to HEX as ';' will be considered as an unknown parameter and we will need to try the encoded entry " VLAN-A=20;" will be 56:4C:41:4E:2D:41:3D:32:30:3B in HEX Run this command to add value to your option 128: system dhcp dhcp-options binding add dhcpname optionname

XGS - DHCP String option 128 Vlan Polycom

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