[Freeswitch-dev] [Freeswitch-Developers] Media Bug on inbound stream

Is there anyway to hook a media bug so that it is only monitoring the inbound stream, but ignoring the outbound audio stream? I have a situation where a call is connected to Freeswitch and playing an IVR application. I would like to signal the application (using Lua) that the inbound audio stream has activity on it. Jonathan