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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <h2 id="AdvancedCodecNegotiation(ACN)-ThisisanAsterisk18proposalfortherefactorofend-to-endcodecnegotiation." class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; margin-top: 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0; margin-top: 0"> <span class="diff-html-changed" id="changed-diff-0" style="background-color: #d6f0ff;">This is an Asterisk 18 proposal for the refactor of end-to-end codec negotiation. </span> </h2> <h3 id="AdvancedCodecNegotiation(ACN)-Here'salinktothelatestinformationonACN:" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0; margin-top: 10px"> <span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">Here's a link to the latest information on ACN:</span> </h3> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">AstriDevCon 2020 Advanced Codec Negotiation Presentation</span></a> </p> <p class="diff-block-context" style="margin: 10px 0 0 0"> </p> <p class="diff-block-context" style="margin: 10px 0 0 0">Within a basic call scenario using Asterisk, where Alice calls Bob, and Bob answers, there are at least four distinct points in the process where it is advantageous to allow user control over the preferred codec order and selection:</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p style="margin-left: 30.0px;; margin: 10px 0 0 0" class="diff-block-context">renegotiate - Attempt to renegotiate endpoints in order to avoid transcoding. However, transcode if necessary.</p> <h1 id="AdvancedCodecNegotiation(ACN)-Dialplan" class="diff-block-target" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" id="changed-diff-1" style="background-color: #d6f0ff;">Dialplan</span> </h1> <p class="diff-block-context" style="margin: 10px 0 0 0">Each of the new negotiation options will also have an associated Asterisk dialplan function that will allow for overriding of those list within the dialplan:</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p style="margin-left: 30.0px;; margin: 10px 0 0 0" class="diff-block-context">PJSIP_MEDIA_REMOTE - read only variable that contains the list of codecs given to Asterisk by the remote device (from an offer or answer).</p> <h1 id="AdvancedCodecNegotiation(ACN)-Scenarios" class="diff-block-target" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" id="changed-diff-2" style="background-color: #d6f0ff;">Scenarios</span> </h1> <p class="diff-block-context" style="margin: 10px 0 0 0">Now that there is an understanding of what each option does, and how they are suppose to work it should be possible to enumerate every joint list at a given point, and the final expected state of Asterisk for a specified configuration. The following will be used for the basic codec configuration across all scenarios:</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> </td>
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