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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="https://wiki.asterisk.org/wiki/display/~mmichelson?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_99ed0aa29d6f204db4785296f8170422" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-context-placeholder" style="margin: 10px 0 0 0; margin-top: 0">...</p> <p class="diff-block-context" style="margin: 10px 0 0 0">RTCP, on the other hand has its writes scheduled based on a calculation performed when sending and receiving RTP traffic. The scheduler used for RTCP is passed into the RTP instance creation function and therefore, the threading is managed by the creator of the RTP instance. In the case of <code style="font-family: monospace">chan_sip</code> and <code style="font-family: monospace">res_pjsip_sdp_rtp</code>, they have all RTCP writes handled by a single thread. In <code style="font-family: monospace">chan_sip</code>'s case, it is the monitor thread that also manages incoming SIP traffic, SIP reloads, and other scheduled tasks (such as outgoing registrations and OPTIONS requests).</p> <h5 id="CurrentRTPstateofAsterisk-Criticisms.2" class="diff-block-context" style="margin: 10px 0 0 0; color: #707070; font-size: 14px; line-height: 20px; margin: 20px 0 0 0">Criticisms</h5> <p class="diff-block-target" style="margin: 10px 0 0 0"> <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Like with RTP reception, there is no buffer for data. The timing for RTP playout is dependent on the parent channel's current situation. During file playback, RTP transmission will be at regular intervals. During bridged calls, transmission timing can vary based on incoming media from the bridged party. Since there is no playout buffer, we again have synchronization issues between output audio and video.</span> </p> <p class="diff-block-context" style="margin: 10px 0 0 0">Remember when I said that RTCP was scheduled based on a "calculation"? Well, that's a lie. There is a function to perform a calculation, but instead of actually performing a calculation, it instead just always says to wait 5 seconds between RTCP transmissions. In its defense, there is a todo XXX comment in the function saying to do a more reasonable calculation based on RFC 3550 Section A.7. This comment dates back to June 2006.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> </td>
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