options Space <option name>=”<value>”
For example, if you want to configure the refer-to-uri-prefix option (the add-on conferencing feature):
Type options, followed by a Space.
Type refer-to-uri-prefix, followed by an equal sign (=).
Type the opening quotation mark (“) followed by conf, another equal sign and the closing quotation mark.
Press Enter.
For example:
options refer-to-uri-prefix=conf=
If the feature value itself is a comma-separated list, it must be enclosed in quotation marks.