Callback-Number Help Page
      Attribute Number: 19
      Value: String
      The value of this attribute is the number to which the RADIUS client
      gear should return a call to the authenticating user. Depending on
      what packet this attribute is found in, different actions may be
      configured. For instance, if Callback-Number is found in an
      Access Request packet, the implementation may assume that the
      end user is requesting callback service. If the attribute is found
      in the Access Accept packet, it can mean everything that the
      administrator configuring the gear wants it to mean. In fact, in
      some cases, Callback-ID and Callback-Number will not be found
      together in one packet.
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