RADIUS attribute from rfc6572

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Service-Selection

The Service-Selection attribute (Type value 146) is of type UTF-8
   text and contains the name of the service or the external network
   with which the mobility service for the particular MN SHOULD be
   associated .  The identifier MUST be unique within the
   PMIPv6 Domain when normalized using the selected normalization form
    for the particular PMIPv6 Domain deployment.  For instance,
    uses the Normalization Form KC (NFKC).

   The MAG MUST include the Service-Selection attribute in the Access-
   Request sent to the AAA if the information was acquired, e.g., by
   operator-specific configuration.  The AAA MAY include the Service-
   Selection attribute in the Access-Accept response message to the MAG
   even if it was not included in the Access-Request as a means of
   indicating the MN's default service.

   The Service Selection mobility option defined in  can be
   used in PBU/PBA messages between the MAG and LMA.  On the LMA-to-AAA
   interface, the LMA MAY populate the Service-Selection attribute in
   the Access-Request message using the service information found in the
   received PBU, if such a mobility option were included.  The Service-
   Selection identifier should be used to assist the PBU authorization,
   the assignment of the MN-HNP, and the IPv4-MN-HoA as described in
    and .

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |      Type     |   Length      |    Service Identifier...      ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type:
      Service-Selection 146.

   Length:
      In octets, including Type and Length fields (>= 3).

   Text:
      This field is of type UTF-8 text and contains the Service
      Identifier with which the MN is associated.

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