Message Caching System

All inbound and outbound SteganRTP messages are cached. The outbound message cache provides a mechanism for retrieval of any given message in the event that the remote application issues a Resend control message requesting that the message be resent. The inbound message cache provides a mechanism for storage of messages received that are beyond the expected sequence number. Once the expected message is received, the others may be read back from the cache rather than requesting that the remote application resend them.