Same call here but I never use this phone line which is tied to a Verizon FIOS triple play account and I am convinced that Verizon sells the numbers out but could be wrong. In my case I have the line tied to a system the records the caller while I play a greeting that basically says "I can't hear you can you speak up" for a number of times. I love it when they try to speak up and get louder or frustrated and it lasts anywhere from 15 to 30 seconds. However as noted by others no audio was captured for this call.
Related Call Detail Records
2015-03-14 14:18:11 Eastern "Brookhaven MS" <6019905520> 6019905520 s 18 sec