3.5.4.4 An RPC Server Application Requests the Session Key of a Client
The caller supplies the RPCServerGenericNamedPipeOpen structure returned by the interface specified in section 3.5.4.1.
Based on the value of the RPCServerGenericNamedPipeOpen.ProtocolDialect field, the request MUST be handled as specified in section 3.3.4.6 or in [MS-SMB2] section 3.3.4.5.