Callback-ID Help Page
      Attribute Number: 20
      Value: String
      This attribute is used when a RADIUS implementation is set up to
      return a user's call. This is commonly used in corporate situations
      to avoid long-distance charges in hotel rooms and other remote
      locations. This value, A STRING, is often the identifier for a
      profile configured on the service equipment; there is no specific
      standrad for a string name, a triggered action, or something else.
      In other words, it is environment specific. RADIUS client gear is
      allowed to reject a connection if this attribute is present but
      not supported by the gear.
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