We only know what's reported to us. And our 1st suggestions are always to try changing port. Because port blocking is generally the 1st step ISP's will try. However they may well be using a specialised program that detects p2p programs & stops/bandwidth shapes them. eg: sandvine : http://www.sandvine.com/products/p2p_element.asp & a few others (b) http://www.ipp2p.org/docu_en.html,
(c) http://www.p-cube.com/new_solutions/traffic_P2P.shtml, (d) http://www.ispreview.co.uk/ispnews/a...03/arc15.shtml