3.3.2.5.2 Handling Responses
If connection concurrent multiplexing is used, a client might receive response PDUs for many requests concurrently. The client MUST use the call_id field of the response PDU to determine what response belongs to what remote procedure method call.
An implementation of these extensions on the client SHOULD enforce a limit on the alloc_hint it receives in the response PDU to be no more than 231-1.
When a response PDU is received, the client MUST update the Last Use Time on the connection time to the current time.