Comcast recently started blocking skypeout calls and other VOIP services. Of course when I call they deny it, but after monitoring my network and several hours of trouble shooting, the only thing left is comcast. I am running both skype and windows on my laptop, and skypeout works fine in either from the local starbucks. Once I get back on good ole comcast however my skypeout calls cut off after 7 seconds. Skype in calls still work fine. I geuss I will be leaving comcast in the very near future. Pitty, because their service has been pretty good and their network is fast.
Some good did come out of all this, while trouble shooting my network I discovered etherape which is a killer network monitor app for linux.