It aims to provide a solution where UDP is too primitive because guaranteed-order packet delivery is desirable, but TCP adds too much complexity/overhead.
In order to ensure quality, it extends UDP by means of adding the following features: RUDP is not currently a formal standard, however it was described in an IETF Internet Draft in 1999.
The versions are mutually incompatible and differ slightly from the IETF draft.
[citation needed] The structure of the Cisco Session Manager used on top of RUDP is also different.
Microsoft introduced another protocol which it named R-UDP and used it in its MediaRoom product (now owned by Ericsson) for IPTV service delivery over multicast networks.