If you have any voicemail solution connected to CUCM such as CUE or CUC or UC, then you configure CFA to voice-mail. In you voice-mail system you need to record your warning message as greeting to be played when call forwarded from hunt-pilot.
No there is no way to do this in cucm. MOH is invoked either when the transfer key is pressed or the hold button is pressed. You cant redirect a DN to MOH. Like Mohammed said you will need aeither unity, unityconnection or cue to play your warning..
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