A while ago there was a question about using REFER (RFC 4579 section 5.5) to add a new participant to a conference, see

http://lists.freeswitch.org/pipermail/freeswitch-users/2012-December/090370.html

Can someone who is successfully using this post a howto including the relevant config, and exact REFER that works?

We’re getting a 202 Accepted in response to an out of dialog REFER, but no INVITE is being sent from FreeSWITCH.

Our config and REFER are as below.

Thanks,

Rick Block

    <extension name="rfc4579_conferences">

      <condition field="destination_number" expression="^(conf4579-.+)">

        <action application="answer" data="is_conference"/>

      <action application="conference" data="$1-${domain_name}@cdquality++flags{rfc-4579}"/>

      </condition>

    </extension>

    To: sip:conf4579-1@10.4.0.7;isfocus

    From: sip:phil@10.4.6.31;tag=329478

    Call-ID: 863823

    CSeq: 28138 REFER

    Refer-To: sip:phil@10.4.0.213

    Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY

    Supported: replaces

    Contact: sip:phil@10.4.6.31

    Via: SIP/2.0/UDP HANB65:5060:branch=z9hG4bk457125;rport

    Content-Length: 0