AC - you're better off getting a host in Miami. This is the first US IP hop for BTL's network.
From Arcos Fiber System
I will tell you that we went through all of this years ago. Starting in March 2006 - when BTL (under Ashcroft) started simply blocking pieces of the SIP handshake rendering calls impossible. Since then (starting in 2009), the blocks have gotten far more sophisticated. At one point, there were inspecting using very expensive gear that would look for flow signatures. Even if it was encrypted, if it looked or smelled like a VoIP session (bidirectional 70kbps UDP flow) - they'd block all traffic between the two hosts. This was PPTP, IPSEC, SSL - whatever.
If BTL wanted to reduce rates, they'd do so. BTL is a huge source or tax revenue for the country and they're not interested in losing the battle. Their network is small enough that they WILL find you. They'll block and block and block until you give up the fight. Keep it small and non-publicized and you may get away with it for a few months to a year.