Our customers would like to be able to confirm calls when using CF/FMFM.
The problem is when one of the calls goes to voice mail...like if a cellular phone is off or out of range.
Levels of sofistication:
low - enable feature for all numbers - user has to press '1' to receive the call
medium - be able to turn call confirmation on/off per number
high - be able to assign a password to each number - keep your kids from answering the phone
FreePBX 2.4 has added this.