<title>Selective retransmission protocol for multimedia on the Internet</title>

Internet multimedia applications have different requirements than do traditional text -based applications, placing new demands on TCP and UDP, the de-facto Internet transport protocols. We propose a Selective Retransmission Protocol (SRP) to balance the potentially high loss found in UDP with the potentially high latency found in TCP. SRP uses an application- specific decision algorithm to determine whether or not to ask for a retransmission for a lost packet, adjusting the loss and latency to the optimum level for the application. We develop and experimentally evaluate an audioconference using SRP on a wide-area network testbed. We find SRP outperforms both TCP and UDP in terms of multimedia application quality.