[Freeswitch-users] Playback on Congestion

Hello Guys, Need some help with a dial plan that I'm working on. The goal is to play a pre-recorded message to the originator on congestion. For example, if GW replies back to FreeSWITCH with code SIP 404, I want to trigger a pre-recorded message and play it back to the originator. Dial plan uses option bridge. If it is not difuclt can some one provide an example of dial plan for this action. Thanks. -- Best Regards, Richard Gleason