Well, the situation is clear for me now
I've used this:
P2P Port Test
Checks ports for many popular P2P protocols
http://www.whatsmyip.org/port-scanner/
And got this.
So, I think BitComet is not OK for me, because BitComet needs an additional ports, which are blocked by my provider. Am I right? =))
Today I was told that I need uTorrent or similar, cause they do not using an additional ports...