RF Bridge Beep Action

Has anyone been able to make the rf_bridge.beep action work? The logs show that the code is executing but not beeping sounds.

If I call the rf_bridge.learn action, the device beeps, so the buzzer is working.

[13:01:31][D][switch:021]: 'rf_bridge_1 Light' Turning ON.
[13:01:31][D][switch:045]: 'rf_bridge_1 Light': Sending state ON
[13:01:31][D][rf_bridge:220]: Beeping for 2000 ms
[13:01:40][D][switch:025]: 'rf_bridge_1 Light' Turning OFF.
[13:01:40][D][switch:045]: 'rf_bridge_1 Light': Sending state OFF
[13:01:40][D][rf_bridge:220]: Beeping for 500 ms