[Freeswitch-users] How to play a prompt to an ongoing conference?

Hello, I would like to know how to play an automatic prompt to an ongoing freeSWITCH conference. The prompt is a wav file and I need to play the prompt at a specific time when the conference is in progress. What is the simplest way to do this? Thank you for any help in advance. Regards, Ranga -- M. Ranganathan