<html><head><base href="x-msg://272/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-US" link="blue" vlink="purple" style="word-wrap: break-word; "><div class="WordSection1"><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Does the requirement of the RTCP (keepalive) change at all when using RTP over RTSP?</span></div></div></div></span></blockquote><div><br></div>No.</div><div><br></div><div><br><blockquote type="cite"><span class="Apple-style-span" style="color: rgb(31, 73, 125); font-family: Calibri, sans-serif; font-size: 15px; ">Certainly, applications get notifications (from the TCP stack) when their peer “goes away” (stops responding to TCP keepalives).</span></blockquote><div><br></div>Yes, in principle. However, this might take a long time (possibly a very long time), depending upon the particular TCP implementation, especially if the server is not currently sending data (e.g., it had received a RTSP "PAUSE" command beforehand).</div><div><br></div><div><br><blockquote type="cite"><span class="Apple-style-span" style="color: rgb(31, 73, 125); font-family: Calibri, sans-serif; font-size: 15px; ">Are you aware of any specifications (based on alternate configuration) that remove the obligation of the RTCP (or noop message) keepalives?</span></blockquote><div><br></div></div>No, and note that RTCP "RR" packets can useful in their own right (for statistics); not just as a 'keepalive'.<br><br><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; ">Ross Finlayson<br>Live Networks, Inc.<br><a href="http://www.live555.com/">http://www.live555.com/</a></span></span>
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