SSL connections, secure connections to newsgroups, https to gmail and any other overseas site all seem to be having problems, so its not just VOIP. And those problems occur 24 hours a day, for the past 3 weeks.
My GMail and other https connections started working a few days ago, although Facebook is now affected for some reason.
I'm on a facebook break so haven't used it in a week or so, gmail has been ok tonight. The only think I've had trouble with (and the only think I've really be using) is https connection to my education provider in australia which has been timing out a lot, not enough to cause mayhem as its only loading up the occasional PDF, but still noticable.
I'll try it again in the morning as it could be an onpeak throttling thing.