cannot get option 160 to work in isc-dhcp-server 4.4.1

[Michael Mears]

Trying to get option 160 to work but when I configure it as a custom option the server fails to start. I have tried several configs and none of them work. The latest one is:

option phone-config code 160 = text;
option phone-config http://192.168.0.254;

I am thinking that maybe option 160 is already defined in the code but if it is I do not know what to call it. For instance option 66 is "tftp-server-name".
Is there a name defined for option 160? Option 160 appears in the list of standard DHCP options defined in  ISC DHCP and Kea and lists it as DHCP Captive Portal. If that is the case I am not sure what to call it out as in the options.

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