RADIUS attribute from rfc5090

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Digest-AKA-Auts

This attribute holds the auts parameter that is used in the
         Digest AKA  calculation.  It is only used if the
         algorithm of the digest-response denotes a version of AKA
         Digest .  This attribute MUST only be used in Access-
         Request packets.
   Type
         118 for Digest-AKA-Auts
   Length
         >= 3
   Text
         In Access-Requests, the RADIUS client takes the value of the
         auts directive (auts-param according to) without surrounding quotes from the HTTP-style
         request it wants to authenticate.

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