Replying to Prank phone to a teacher...dont do

so i was with my hockey team partying and after we were hammerd we decided to prank phone call this teacher most of us had before we went to bed. so i gave the teachers phone number to a kid who then gave the number to the kid who planned on calling the teacher. we will call him alfred. so alfred blocks the call so he cant get in trouble. Alfred said"fuck me im irish" and other shit like that and then said my full name as the person that called it. he was laughing when he said it. so then they call again and get the voicemail and say stuff like u have a big fupa and 2 other kids did so to. i never said anything on the voicemail. so today the housemaster emails my parents asking if i was involved and ofcourse im denying that i did anything which is true. so tommrow my parents are going to say where the party was and who was there(i know my parents are fags). so, my question is, will i get in trouble if no one fesses up? im assuming if i go down we all go down which would be gay. Im hoping Alfred will man up and say it was him. hes a senior and really doesnt have anything to loose. im a sophmore and could get expelled since ive already gotten suspended for this teacher and get kicked off the hockey team. whats ur guys and girls thoughts. im hoping the kid fesses up but can the school really get me in trouble for something i didnt take part in even though i was there?