Dest = s?

I’m looking through my call-logs and trying to figure out what it means when the destination is “S”.

I figured that it may be due to some of the numbers being on my block list, however, some numbers are showing up that are not blocked but still showing up as “S”.

Is there any way I can find out the reasoning to why this shows up as “S”?

http://tinyurl.com/663kvfo