[Freeswitch-users] RFC 4579 and FreeSWITCH

Hi guys, I started playing with FreeSWITCH to make conferences and I was curious about the support for RFC 4579 (Call Control - Conferencing for User Agents). I was able to have FreeSWITCH return a ;isfocus parameter in the Contact (from the 200 OK) and I tried to add a new participant to the conference using a REFER (see RFC 4579 section 5.5), which generated the following log: [ERR] sofia.c:7095 Cannot Blind Transfer 1 Legged calls I think RFC 4579 is mentioned on the FS wiki as a "supported" RFC but is this call flow currently supported? Cheers and thanks for the awesome work in FS, Francis