the SWAT terrorists are hijacking a phone number associated with the victims, to make the call look more authentic
This is not a mere prank call. It is a criminal act intended to cause possible injury or death to the victim and his family in the confusion of being stormed unexpectedly by armed police who are expecting to confront violent criminals
Fortunately Erickson was aware of this tactic being used, and supposedly had discussed it with his local police
That is why the guy(s) heading this up (and funded by TIDES foundation/Soros) have done time in prison for domestic terrorism- they are pros
http://www.breitbart.com/Big-Government/2012/05/27/former-doj-attorney-eric-holder-could-stop-swatings-in-48-hours