This key allows you to access the contracted operator services offered by your telephone company or switchboard, such as: "call forwarding", "call waiting", ”answering service", etc. To do this, when off-hook, you must press the R key (5) and the code corresponding to the supplementary operator service you wish to use.
Note: In order to use the supplementary operator services on this telephone, it is necessary to have contracted them from your telephone company.