I believe most incoming calls to Law Enforcement agencies are recorded,along with caller ID.With all thats been going on in that area,I'd be really surprised if this call wasn't recorded, I hope Moose is just trying to sucker the suspect into a trace.I'd be even more surprised if anyone would fall for this.
I see a "plant" coming. Where someone dials that number on a cell phone, leaves it on and connected (possibly to a recording, but just dead air will leave a signal), and while LE swarms the traced area something happens miles away...