In the past week, this number has called my landline several times repeatedly, without leaving a message on voicemail. Don't know identify...just says "SSI".
I am also having the same problem. Sometimes the calls come in just minutes apart. They never leave a message. Caller ID is 'SSI' and phone number, no area code. I usually ignore it, and I don't bother picking up.
I picked up and there was no one there. So annoying! Especially considering that five seconds ago, I got another call from one of those computer-virus scammers.