5.19 Callback-Number

5.19. Callback-Number

Description

  This Attribute indicates a dialing string to be used for callback.
  It MAY be used in Access-Accept packets.  It MAY be used in an
  Access-Request packet as a hint to the server that a Callback
  service is desired, but the server is not required to honor the
  hint.

A summary of the Callback-Number Attribute format is shown below. The fields are transmitted from left to right.

0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- | Type | Length | String ... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

Type

  19 for Callback-Number.

Length

  >= 3

String

  The String field is one or more octets.  The actual format of the
  information is site or application specific, and a robust
  implementation SHOULD support the field as undistinguished octets.

  The codification of the range of allowed usage of this field is
  outside the scope of this specification.