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.... 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