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This might be what you're looking for, this is a SIP Profile parameter:</div>
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<param name="NDLB-sendrecv-in-session" value="true"/><br>
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<a href="https://freeswitch.org/confluence/display/FREESWITCH/NDLB" id="LPlnk">https://freeswitch.org/confluence/display/FREESWITCH/NDLB</a><br>
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It may also be possible to re-write the SDP per call:</div>
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<a href="https://freeswitch.org/confluence/display/FREESWITCH/Codec+Negotiation#CodecNegotiation-RewritingSDP" id="LPlnk">https://freeswitch.org/confluence/display/FREESWITCH/Codec+Negotiation#CodecNegotiation-RewritingSDP</a><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> FreeSWITCH-users <freeswitch-users-bounces@lists.freeswitch.org> on behalf of Oleg Belousov <obelousov@gmail.com><br>
<b>Sent:</b> 12 September 2020 22:22<br>
<b>To:</b> FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org><br>
<b>Subject:</b> [Freeswitch-users] Add a=sendrecv onto sdp</font>
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<div dir="ltr">Hi.
<div>Please advise how I can add a=sendrecv parameter onto the SDP part of 183 Session progress. I'm using preAnswer in lua script to respond 183 with SDP to an invite.<br clear="all">
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<div dir="ltr" class="x_gmail_signature">--<br>
<a href="http://obelousov.tel" target="_blank">obelousov.tel</a></div>
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