Hello Freeswitch Team, I am new to freeswitch and trying to figure out if Freeswitch support RFC 4579 adding new member to conference by REFER. *Question:* Will Freeswitch support adding a member to conference by means of REFER message as mentioned in RFC 4579 section 5.5 ( https://tools.ietf.org/html/rfc4579 ) ? *What all I tried so far:* I tried the exercise given in confluence dial-plan way to add a member to conference but it works through DTMF trigger. I am looking for something SIP based resource add to conference. I see that Freeswitch documentation says It supports RFC 4579, But will it support adding member to conference by REFER messages(5.5 section in RFC 4579) ? I saw many Tickets around this area but nothing clearly answers my question. Few example links: https://freeswitch.org/jira/browse/FS-7259 https://freeswitch.org/jira/si/jira.issueviews:issue-html/FS-5611/FS-5611.ht... https://lists.freeswitch.org/pipermail/freeswitch-users/2016-August/121795.h... *Scenario I tried :* When I try to REFER a member to conference, Freeswitch trigger the outbound call but it treats it as blind transfer and kicks out the party which sends refer message. I want freeswitch just to include the referred member but not kick out the party which sent refer. and be in conference call. ==================================================================================================== There are 2 members in conference. one member is dialed through gw. that member is trying to add another client which is sip:service@172.29.0.3. Freeswitch triggers the Invite to Refer-To member but it sends BYE to Referred-By member. Treating it as a blind transfer. ==================================================================================================== REFER sip:gw+sbc@172.29.0.2:5060 SIP/2.0 Via: SIP/2.0/TCP 172.29.0.3:5060;branch=z9hG4bK-34-1-5 Max-Forwards: 70 To: <sip:gw+sbc@172.29.0.2:5060>;tag=mB6pSrNNZ4Sta From: sut <sip:service@172.29.0.3:5060>;tag=34SIPpTag011 Call-ID: 0ce57982-42a7-1238-c39e-0242ac1d0002 CSeq: 8859010 REFER Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Refer-To: <sip:service@172.29.0.3:5080;transport=TCP> Referred-By: <sip:172.29.0.3:5060> Contact: <sip:172.29.0.3:5060;transport=TCP> Content-Length: 0 Is it possible in freeswitch ? Thanks, Geeta -- Your privacy is important to us. That is why we have taken appropriate measures to ensure the data you provide to us is kept secure. To learn more about how we process your personal information, how we comply with applicable data protection laws, and care for the security and privacy of your personal data, please review our Privacy Policy <https://www.motorolasolutions.com/en_us/about/privacy-policy.html#privacystatement>. If you have any questions related to data protection and compliance with applicable laws, please contact us at our Security Operations Center at 1-302-444-9838 or mail us at:  Attention: Privacy Compliance Program, P.O. Box 59263, Schaumburg, IL USA, 60159-0263