This should help...
router(config-voiceport)#busyout monitor probe 10.10.10.10 ?
codec Codec
grace-period set delay time before reporting icpif failure
icpif ICPIF threshould
loss Loss threshold
router(config-voiceport)#busyout monitor probe 10.10.10.10 grace-period ?
<30-300> delay in seconds
Command Default
If the busyout monitor probe command is not entered, the voice port does not monitor SAA probe signals.
If the busyout monitor probe command is entered with no optional keywords or arguments, the default codec type is G.711 a-law, the default loss and delay thresholds are the threshold values that are configured with the call fallback threshold delay-loss command, and the loss of SAA connectivity causes an immediate forced busyout condition.
http://www.cisco.com/en/US/docs/ios/12_3t/voice/command/reference/vrht_b1_ps5207_TSD_Products_Command_Reference_Chapter.html#wp1551123