3.4.4.2 RasRpcGetUserPreferences (Opnum 9)
When the method completes successfully with a return value of ERROR_SUCCESS, the client SHOULD free the memory allocated by RPC. The following fields of RASRPC_PBUSER MAY contain RPC allocated memory: pCallbacks, pLocations, pPhonebooks, pAreaCodes, pPrefixes, pSuffixes.