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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/~gjoseph?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_56b2a47747d2721d6dcf26979b4b605a" 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">This document is by no means complete and neither is the software as of July 15, 2020. There are still lots of things to implement and/or test.</p>
<ul class="diff-block-target" style="margin: 10px 0 0 0">
<li> <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Multi-channel operation</span> </li>
<li>Direct Media</li>
<li> <span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">100rel/early media</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Re-invites</span> </li>
<li>Fax</li>
<li> <span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">Multi-stream</span> </li>
<li>Deferred SDP</li>
<li> <span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Re-invites</span> </li>
<li> <span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">ARI channel operations</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Interoperability with other channel drivers</span> </li>
<li>Dialplan function</li>
<li>etc.</li>
</ul> <p class="diff-block-context" style="margin: 10px 0 0 0">We're still working on it.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p>
<ul class="diff-block-context" style="margin: 10px 0 0 0">
<li>Alice Offer -> Asterisk ->Bob:
<ul style="margin: 10px 0 0 0; margin-top: 0">
<li> <strong>incoming_offer</strong>: This gets handled in chan_pjsip:chan_pjsip_incoming_request() before the channel is actually created. That function is called by session via the handle_incoming_request supplement. The function resolves the topology created from Alice's offer with Alice's endpoint 's incoming_offer parameters and endpoint codecs. Assuming there active streams left in the resolved topology, the function resets the pending topology on the session to be the resolved topology and calls chan_pjsip_new which sets the topology on the channel along with the native format caps and read and write formats. NOTE: We don't set the rtp instance codecs here but we should. If the resolution fails, we terminate with a 488.</li>
<li>Eventually we work our way through to app_dial:dial_exec_full which creates Bob's outgoing channel with ast_request_with_stream_topology() passing in Alice's channel topology.</li>
<li> <strong>outgoing_offer</strong>: ast_request_with_stream_topology() calls chan_pjsip_request_with_stream_topology(). This then resolves the request topology (pending) with Bob's endpoint's outgoing_offer parameters and Bob's endpoint's endpoint codecs. Assuming there are active streams left in the topology, the function calls chan_pjsip_new() which sets Bob's channel topology, native format caps and read/write formats. Same note as above, we should set the rtp instance codecs here but we don't yet. If the resolved topology, including applying transcoding options, didn't have any active streams left, we return a cause of AST_CAUSE_FAILURE to app_dial and bail which causes a 503 to be sent to Alice. </li>
<li>dial_exec_full ultimately calls chan_pjsip_call() whose call() task calls ast_sip_session_create_invite() then ast_sip_session_send)request().</li>
</ul> </li>
<li>Bob Answer -> Asterisk -> Alice
<ul style="margin: 10px 0 0 0; margin-top: 0">
<li> <strong>incoming_answer</strong>: When Bob sends a 200OK, pjproject calls our session_inv_on_media_update() callback which then calls res_pjsip_session:handle_negotiated_sdp(). That sets the active topology to that received from Bob. Eventually pjproject signals a transaction state change based on receiving the 200 which triggers the session handle_incoming_response supplements, one of which is chan_pjsip_incoming_response_after_media(). That resolves the active topology that came from Bob, with the topology we sent Bob using Bob's endpoint's incoming_answer preferences. The function then calls ast_queue_control_data with an AST_CONTROL_ANSWER frame type and the resolved topology as the data.</li>
<li>app_dial:wait_for_answer() receives the ANSWER frame and places the topology into the bridge config structure. That gets passed to features:ast_bridge_call() and down to pre_bridge_setup() which calls ast_raw_answer_with_stream_topology(). That in turn calls chan_pjsip_answer_with_stream_topology on Alice's channel.</li>
<li>outgoing_answer: chan_pjsip_answer_with_stream_topology's answer task does the final resolution using Bob's active topology, Alice's pending topology that was originally sent to the core, and Alice's endpoint's outgoing_answer parameters.</li>
</ul> </li>
</ul> <p class="diff-block-context" style="margin: 10px 0 0 0"> </p> <p class="diff-block-context" style="margin: 10px 0 0 0"> </p> <p class="diff-block-context" style="margin: 10px 0 0 0"> </p> <p class="diff-block-target" style="margin: 10px 0 0 0"> <span style="color: rgb(237,235,232);font-family: "Roboto Mono" , "SF Mono" , "Lucida Console" , Monaco , monospace;font-size: 13.006px;white-space: pre-wrap;"><span class="diff-html-added" id="added-diff-3" style="font-size: 100%; background-color: #ddfade;">* Direct media * 100rel/early media * Re-invites * Fax * Multi-stream * Deferred SDP * ARI channel operations * Operation with other channel technologies</span></span> </p> </td>
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</body>
</html>