[Freeswitch-users] ESL Outbound: how to bridge media?

The problem I have is to propagate the audio coming from an "originated" outbound session to the inbound session when the outbound is in the PROGRESS MEDIA phase. When my application receives the "CHANNEL_PROGRESS_MEDIA" event from outbound session I can do a "pre_answer" on inbound session but I'm not capable to do an audio bridge. I have tried with "uuid_bridge <outbound_uuid> <inbound_uuid>" with no result probably because this api requires that at least one session must be answered. I don't want to answer to the inbound session to propagate the outbound progressing media but I want to answer to inbound only on outbound answer. Any way to do that? Stephen