Advanced Call Manager for Android 1.02
the author of this app says:
Hundreds on your contact book and hundreds more who can access your number and call any time they find fit. Is there a way to make owning a phone less intrusive while staying connected with others? More efficient call-handling options you can assign to different contacts. ACM gives you three more ways to subtly escape calls without having to hang up: *Busy tone - send a busy tone to callers. This way you appear constantly busy without acting rude by hanging up. * Busy tone and SMS - add a personal touch to sending a busy tone: inform your callers about your availability with automatic pre-assigned SMS replies. *Mute the ringer - let the calls through with a muted ringer. More discrete, as it does not give the caller any information about your availability while keeping you undisturbed. Handle groups of contacts by creating lists. The easiest way to handle your calls is to divide callers in lists such as Friends, Family, Work and assign blocking rules for each. ACM gives you several handy list options: * Create blacklists and whitelists - block or allow calls from people on this particular list. * Various contact-import options - simple and speedy list creation. * Individual settings allowed - personalize how ACM handles an individual caller included in a list (for example, send a specific SMS auto-reply to your mother while the default blocking action for list Family is to send busy tone).
Android OS 1.5 or higher.