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How does REFER-Issuer enables the feature? Commonly is preceded by OPTIONS (or other previous engagement between the UAs) Supported Header in the Request REFER-Issuer is willing supporting the feature for the particular REFER Required Header in the Response If the REFER-Recipient chooses to not establish the subscription, it includes the tag in the Require Header in the response Require Header in the Request Is used by REFER-Issuer when it mandates using the feature for the particular REFER |