Hello, I only mean that the client can deliver candidates. The Freeswitch of course sends all candidates in the first SDP. Currently I'm trying to implement the Full Trickle mechanism as described here https://tools.ietf.org/id/draft-ietf-mmusic-trickle-ice-sip-11.html Candidates should be forwarded via SIP Info during the connection setup. Since I haven't succeeded so far, I have the following questions. Is Full Trickle supported via mod_sofia? If so, which settings or sip headers are required? Thanks Alex