I believe this is an old issue but want to see if anyone has an updated workaround. The customer wants live answer during the day but following a open closed schedule go direct to voicemail at night.
If I do this with a Call Handler the live answer is a supervised transfer and the caller hears "please hold while your call is transfered" Along with the MOH instead of ring back. There is an unsupported way of blanking out the "please hold..." wav file but I was wondering if there is a better way of doing this with 5.1 and unity connection 1.2.
This feature on CCM will allow these type of schedules to be setup, have a look at "Time of Day Routing" on CCM it should do what you need and more;
Cisco Unified CallManager System Guide, Release 5.1.3
From this doc;
Also check out this this excellent presentation on Time of Day Routing supplied recently by Tom (it includes a great step by step and examples);
Hope this helps!