Verotel recently changed their rules, they now split you into one of two camps depending on your processing volume. I think they also charge you registration fees if you are a larger volume processor. I know of clients that use verotel and are happy with them & I think that these changes will help them last longer with all the visa rules/regs. You should check out their website to get all the info, I used to know their rules but since they changed I am not fully sure anymore.

cheers,
Luke