<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false"><font size="2">Hi to all, </font></div><div dir="ltr" data-setdir="false"><font size="2"><br></font></div><div dir="ltr" data-setdir="false"><font size="2">I am trying to use FS to handle a 3-way call conference with REFER. </font><div><font size="2"><span style="color: rgb(29, 28, 29);">A calls B, then puts B on hold and then calls C, then puts C on hold too, and calls conference room. After that A sends REFER to FS for B and C to move them to conference room. FS handles first REFER and transfers B leg to conference room correctly, but unexpectedly FS sends a BYE to A party for conference call too and terminated A party from conference with this :Reason: </span><code data-stringify-type="code" class="ydp581b6a5fc-mrkdwn__code" style="padding: 2px 3px 1px; border-radius: 3px; color: rgb(224, 30, 90); line-height: 1.50001; white-space: pre-wrap;">SIP;cause=601;text="ATTENDED_TRANSFER"</code><br style="color: rgb(29, 28, 29);"><br></font></div><div dir="ltr" data-setdir="false"><font size="2"> I put this config in conference: <font color="#cd232c"><param name="conference-flags" value ="rfc-4579"/></font> but did not help and FS does not any '<span><span style="color: rgb(23, 43, 77);">isfocus' to OK contact header for A party.</span></span></font></div><div dir="ltr" data-setdir="false"><font size="2"><span><span style="color: rgb(23, 43, 77);">So is there any other config? or FS does not really handle Ad hoc conferencing based on RFC 4579.</span></span></font></div><div dir="ltr" data-setdir="false"><font size="2"><span><span style="color: rgb(23, 43, 77);"><br></span></span></font></div><div dir="ltr" data-setdir="false"><font size="2"><span><span style="color: rgb(23, 43, 77);">Thanks for your help.</span></span></font></div><div dir="ltr" data-setdir="false"><font size="2"><span><span style="color: rgb(23, 43, 77);"><br></span></span></font></div><div dir="ltr" data-setdir="false"><font size="2"><span><span style="color: rgb(23, 43, 77);"><br></span></span></font></div><div dir="ltr" data-setdir="false"><font size="2"><span><span style="color: rgb(23, 43, 77);">Regards,</span></span></font></div><div dir="ltr" data-setdir="false"><font size="2"><span><span style="color: rgb(23, 43, 77);">Hossein</span></span></font></div></div></div></body></html>