请教fitwxc和各位高手：关于FUP exceeded的问题

First I'd like to express my Big thanks to fitwxc, for all your posts which help me so much that now I can use my ATA to make phone call all over the world.

Yesterday I tried my ATA through Sipsorcery for the first time to call China, the voice quality was great. It is just as good as ItalkBB, maybe even better.

I am using voipbusterpro as my voip service provider, and as I mentioned above this was my first time to make call with vp. But I already got FUP exceeded message, and they charged me at normal rate. That's just way too expensive and very unfair to all people who encounter this issue. I am pretty sure too many people using Sipsorcery to route their calls cause this problem .

So my question is: Is there any workaround? If yes, could you please provide us some solutions to this issue.

Once again, thank you so much for your help.