"It appears port 1720 (a VoIP [Voice over IP] port) is being unthrottled by some ISP's, so you may have to check that out as well. Alternatively, if all else fails, you could try port 443, 80, 21, 110 and as a last resort, 25. But it's better if you could try to find out what ports your ISP uses for NetMeeting/VoIP/Xbox Live etc. This is a legitimate question and they should be able to answer you what ports they use for these services without any problem/suspicion. It could very well be possible that you can bypass their BitTorrent restrictions using these types of ports. Here's a handy list of ports and their common uses."
I'm currently using port 1720 but with no luck. Does anyone know what port Xtra uses for VoIP or XBOX Live?