[r4cec4r]

Purely anecdotal but I've had some success answering these calls and asking to be put on their do not call list. There was one that called me multiples times per day for weeks and left 30 second voicemails each time. I ignored them thinking at some point they'd give up or think the number wasn't active but the calls kept coming. It wasn't until I actually answered one and told them not to call me anymore that the calls stopped. It seems like the general advice is to ignore these calls but anecdotally I've never found that strategy to work.

[jaredhallen]

Interesting. I seem to have had the opposite experience. I tried the method you're suggesting for a while, but there always seemed to be a flurry of additional calls after answering one. I thought that maybe the answered call was noted somehow as indicating that the number was valid. Completely anecdotal, just my $0.02.

[r4cec4r]

It seems to depend on the business that's doing the calling I guess. I had one that I answered and the person literally laughed at me and hung up so YMMV.