may assign a
 default handler to the configuration. The CallbackHandler assigned to the configuration must support the Callback
 objects required to be supported by the profile of this specification being followed by the messaging runtime. The
 CallbackHandler instance must be initialized with any application context needed to process the required callbacks on
 behalf of the corresponding application.</dd>
<dt>Returns:</dt>
<dd>A ServerAuthConfig Object that describes the configuration of ServerAuthModules 