This option tag is for reliability of provisional responses. When present in a Supported header, it indicates that the UA can send or receive reliable provisional responses. When present in a Require header in a request it indicates that the UAS MUST send all provisional responses reliably. When present in a Require header in a reliable provisional response, it indicates that the response is to be sent reliably. Defined in rfc 3262.

public const string x100rel

Public Const x100rel As String

public:
literal String^ x100rel

static val mutable x100rel: string