[Freeswitch-users] Play audio until early media

Is there a way to play a ringback... until the actual ring starts? The intention is a "placeholder" on my calling card until the actual ring starts. Sometimes mobiles take quite a while to start ringings, and sometimes numbers keep timing out - I'd like to give an audio-feedback that the process is indeed working. I know I can easily start the ringing right away, but I don't want to do that because it gives the impression that the call is actually going through, which may not be the case. I don't see anything that immediately apparent on the wiki - any suggestions? Thanks, -Avi