I receive frequent calls from 301-882-9942 with Caller ID "SOMD" and no one on the line.  When I try to call 301-882-9942 to ask them to stop calling, I either get a busy or dead air.  Tried Call Block using my Verizon service, but this only works on Verizon local numbers.  Consequently, I am going to pay $5/month and sign up for Call Intercept so that I can selectively block up to 20 numbers.

It's unfortunate that we have to take action and pay to stop these annoying telemarketers, but that's what I am going to do.