said by Stewart:I completely agree with suggestions regarding whitelist. said by Davesnothere:
The only question left in MY mind is whether to use a blacklist, a whitelist, or both, but for now I'm just seeing how effective the 'Press Key' step seems to be on its own.
I strongly recommend that you implement the whitelist ASAP, at least for your parents / wife / kids / anyone that you really care about.
It's dangerous to send DTMF while driving. In the good old days, it wasn't so bad -- you would just feel for the 3 button. But with Android or iPhone, you have to take your eyes off the road twice, first to find the "show keypad" button, then to find the 3.
If you insist on IVR for all, your contacts may be able to automate pressing 3. If their hands-free calling is phone-based, it is a simple matter of programming the Contact entry to have a "pause" followed by 3. However, if they are using the "dial by name" function of their car's multimedia system, then the pause function needs to be set in the car's phonebook, and some don't have that feature.
Other disadvantages of the forced IVR include that a caller will be charged one minute, even if they hang up before you answer. Also, it thwarts automation on the caller's side, e.g. if they want a speed dial on their PBX that will call your mobile, if you don't answer at home.