two desktops starting ringing like classic phone at random

atomicWAR

Glorious
Ambassador
My title says it all. My first thought was some bit of malware but i have run spybot 2 and norton 360 with no luck. I also thought it was just one of my computers but i noticed my other desktop started doing it today as well. It will ring one or twice sounding like a classic phone. I do not have skype installed or messangers no freshly installed programs or anything else suspect today. It even happened while playing castlevania lords of shadow so i don't think its just some random ring in an ad online (i have seen other posts about phone rings but most blow it off on online ads and i was not surfing the net a few times it has rang like in my game or watching netflix). i am very close to wiping all my drives and starting from scratch if i can't find a fix/confirmation from someone else about what the issue is. your input would be great.