Who called from 9513841581

Calls. Hangs up. All hours. Blocked on phone now.

calls no message other sites say it is a Riverside voip number. Understanding What VoIP Means - For Dummies
http://www.dummies.com/how-to/content/understanding-what-voip-means.html
VoIP — which stands for voice over Internet protocol and often pronounced voyp ... Depending on the size of the LAN and the number of users, you may use ...

Same here. I threatened to call Immigration and she hung up.

I answered and a female robot type voice said goodbye.

Same